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This dataset shows the extent of the coastline or site being monitored in the OPW Pilot Coastal Monitoring Survey Programme. The purpose of the Pilot Coastal Monitoring Survey Programme is to obtain up to date coastal survey data to inform and facilitate enhanced management of the associated coastal risks; quantify and identify ongoing rates of change (e.g. in erosion and recession, beach levels/volume, foreshore features, etc.); identify areas of recovery or accretion; support the development and/or updating of numerical coastal process models to improve our knowledge and understanding of the behaviour and impact of tides, wave and sediment transport at the coast and of how these may change over time and potentially increase risk for coastal communities.

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This dataset shows areas that have been or are planned to be surveyed as part of the Pilot Coastal Monitoring Survey Programme - Aerial Photography Surveys. The primary deliverables from these surveys include the following:
- 0.05m resolution red, green, blue (RGB) and near infrared ortho-rectified images.
- 0.05m resolution ortho-rectified composite images.
- 0.25m, 0.5m, 1.0m and 2.0m Digital Surface Models (DSMs).
- 0.25m, 0.5m, 1.0m and 2.0m Digital Terrain Models (DTMs).

The purpose of the Pilot Coastal Monitoring Survey Programme is to obtain up to date coastal survey data to inform and facilitate enhanced management of the associated coastal risks; quantify and identify ongoing rates of change (e.g. in erosion and recession, beach levels/volume, foreshore features, etc.); identify areas of recovery or accretion; support the development and/or updating of numerical coastal process models to improve our knowledge and understanding of the behaviour and impact of tides, wave and sediment transport at the coast and of how these may change over time and potentially increase risk for coastal communities.

To request data for areas where surveys have been completed please email flood_data@opw.ie.

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This dataset shows areas that have been or are planned to be surveyed as part of the Pilot Coastal Monitoring Survey Programme - LiDAR Surveys to collect high resolution LiDAR data (circa 16 points/m2). The primary deliverables from these surveys include the following:
- 0.25m, 0.5m, 1.0m and 2.0m Digital Surface Models (DSMs)
- 0.25m, 0.5m, 1.0m and 2.0m Digital Elevation Models (DTMs)

The purpose of the Pilot Coastal Monitoring Survey Programme is to obtain up to date coastal survey data to inform and facilitate enhanced management of the associated coastal risks; quantify and identify ongoing rates of change (e.g. in erosion and recession, beach levels/volume, foreshore features, etc.); identify areas of recovery or accretion; support the development and/or updating of numerical coastal process models to improve our knowledge and understanding of the behaviour and impact of tides, wave and sediment transport at the coast and of how these may change over time and potentially increase risk for coastal communities.

To request data for areas where surveys have been completed please email flood_data@opw.ie.

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This dataset shows areas that have been or are planned to be surveyed as part of the Pilot Coastal Monitoring Survey Programme - Bathymetry Surveys. Survey points will be recorded at intervals of at least 5m along the survey lines, with survey lines run at 200m, parallel to the coastline. Survey points will also be recorded on a 10m grid in the intertidal foreshore and other areas as required.

The purpose of the Pilot Coastal Monitoring Survey Programme is to obtain up to date coastal survey data to inform and facilitate enhanced management of the associated coastal risks; quantify and identify ongoing rates of change (e.g. in erosion and recession, beach levels/volume, foreshore features, etc.); identify areas of recovery or accretion; support the development and/or updating of numerical coastal process models to improve our knowledge and understanding of the behaviour and impact of tides, wave and sediment transport at the coast and of how these may change over time and potentially increase risk for coastal communities.

To request data for areas where surveys have been completed please email flood_data@opw.ie.

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This dataset shows areas that have been or are planned to be surveyed as part of the Pilot Coastal Monitoring Survey Programme - Topographic Beach Profile Surveys

The purpose of the Pilot Coastal Monitoring Survey Programme is to obtain up to date coastal survey data to inform and facilitate enhanced management of the associated coastal risks; quantify and identify ongoing rates of change (e.g. in erosion and recession, beach levels/volume, foreshore features, etc.); identify areas of recovery or accretion; support the development and/or updating of numerical coastal process models to improve our knowledge and understanding of the behaviour and impact of tides, wave and sediment transport at the coast and of how these may change over time and potentially increase risk for coastal communities.

To request data for areas where surveys have been completed please email flood_data@opw.ie.

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This data shows the extent of land that might be flooded by the sea (coastal flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The Present Day Scenario is also referred to as the Current Scenario. Present Day Scenario data was generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on. Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

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This data shows the extent of land that might be flooded by the sea (coastal flooding) and the associated flood depths during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The Present Day Scenario is also referred to as the Current Scenario. Present Day Scenario data was generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on. Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

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This data shows the extent of land that might be flooded by the sea (coastal flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The Mid-Range Future Scenario (MRFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 500mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

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This data shows the extent of land that might be flooded by the sea (coastal flooding) and the associated flood depths during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The Mid-Range Future Scenario (MRFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 500mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

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This data shows the extent of land that might be flooded by the sea (coastal flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High End Future Scenario (HEFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 1000mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

Layer Information
This data shows the extent of land that might be flooded by the sea (coastal flooding) and the associated flood depths during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High End Future Scenario (HEFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 1000mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

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This data shows the extent of land that might be flooded by the sea (coastal flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High+ End Future Scenario (H+EFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 1500mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

Layer Information
This data shows the extent of land that might be flooded by the sea (coastal flooding) and the associated flood depths during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High+ End Future Scenario (H+EFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 1500mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

Layer Information
This data shows the extent of land that might be flooded by the sea (coastal flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High++ End Future Scenario (H++EFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 2000mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

Layer Information
This data shows the extent of land that might be flooded by the sea (coastal flooding) and the associated flood depths during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past. This represents the worst case scenario as any flood defences potentially protecting the coastal floodplain are not taken into account. Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as the chance or odds (e.g. 200 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 200-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out the range of flood event probabilities for which coastal flood extent maps were developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High++ End Future Scenario (H++EFS) maps represent a projected future scenario for the end of century (circa 2100) and include allowances for projected future changes in sea levels and glacial isostatic adjustment (GIA). The maps include an increase of 2000mm in sea levels above the current scenario estimations. An allowance of -0.5mm/year for GIA was included for the southern part of the national coastline only (Dublin to Galway and south of this). Flooding from other sources may occur and areas that are not shown as being within a flood extent may therefore be at risk of flooding from other sources. The flood extent and depth maps are suitable for the assessment of flood risk at a strategic scale only, and should not be used to assess the flood hazard and risk associated with individual properties or point locations, or to replace a detailed flood risk assessment.

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This data shows the modelled extent of land that might be flooded by rivers (fluvial flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past.

Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as odds (e.g. 100 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 100-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out a range of flood event probabilities for which fluvial and coastal flood maps are typically developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The Present Day Scenario is also referred to as the Current Scenario. Present Day Scenario data was generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

Data has been produced for catchments greater than 5km2 in areas for which flood maps were not produced under the National CFRAM Programme and should be read in this context. River reaches that have been modelled are indicated by the NIFM Modelled River Centrelines dataset.

Flooding from other reaches of river may occur, but has not been mapped, and so areas that are not shown as being within a flood extent may therefore be at risk of flooding from unmodelled rivers (as well as from other sources).

The purpose of the Flood Maps is not to designate individual properties or point locations at risk of flooding, or to replace a detailed site-specific flood risk assessment.

Layer Information
This data shows the modelled extent of land that might be flooded by rivers (fluvial flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past.

Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as odds (e.g. 100 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 100-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out a range of flood event probabilities for which fluvial and coastal flood maps are typically developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The Mid-Range Future Scenario extents where generated taking in the potential effects of climate change using an increase in rainfall of 20%.

Data has been produced for catchments greater than 5km2 in areas for which flood maps were not produced under the National CFRAM Programme and should be read in this context. River reaches that have been modelled are indicated by the NIFM Modelled River Centrelines dataset.

Flooding from other reaches of river may occur, but has not been mapped, and so areas that are not shown as being within a flood extent may therefore be at risk of flooding from unmodelled rivers (as well as from other sources).

The purpose of the Flood Maps is not to designate individual properties or point locations at risk of flooding, or to replace a detailed site-specific flood risk assessment.

Layer Information
This data shows the modelled extent of land that might be flooded by rivers (fluvial flooding) during a theoretical or ‘design’ flood event with an estimated probability of occurrence, rather than information for actual floods that have occurred in the past.

Flood event probabilities are referred to in terms of a percentage Annual Exceedance Probability, or ‘AEP’. This represents the probability of an event of this, or greater, severity occurring in any given year. These probabilities may also be expressed as odds (e.g. 100 to 1) of the event occurring in any given year. They are also commonly referred to in terms of a return period (e.g. the 100-year flood), although this period is not the length of time that will elapse between two such events occurring, as, although unlikely, two very severe events may occur within a short space of time. The following table sets out a range of flood event probabilities for which fluvial and coastal flood maps are typically developed, expressed in terms of Annual Exceedance Probability (AEP), and identifies their parallels under other forms of expression.

The High-End Future Scenario extents where generated taking in the potential effects of climate change using an increase in rainfall of 30%.

Data has been produced for catchments greater than 5km2 in areas for which flood maps were not produced under the National CFRAM Programme and should be read in this context. River reaches that have been modelled are indicated by the NIFM Modelled River Centrelines dataset.

Flooding from other reaches of river may occur, but has not been mapped, and so areas that are not shown as being within a flood extent may therefore be at risk of flooding from unmodelled rivers (as well as from other sources).

The purpose of the Flood Maps is not to designate individual properties or point locations at risk of flooding, or to replace a detailed site-specific flood risk assessment.

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Geological Survey Ireland have developed Groundwater Flood Maps for the Republic of Ireland. The maps were developed in as part of the 2016-2019 GWFlood project in collaboration with Trinity College Dublin and the Institute of Technology Carlow.

The Winter 2015/2016 Surface Water Flooding map shows fluvial (rivers) and pluvial (rain) floods, excluding urban areas, during the winter 2015/2016 flood event, and was developed as a by-product of the historic groundwater flood map.

The map is a vector dataset. The floods are shown as polygons. Each polygon has info about the type of flood, the data source, and the area of the flood. The flood extents were made using remote sensing images (Copernicus Programme Sentinel-1), which covered any site in Ireland every 4-6 days. As such, it may not show the true peak flood extents.

Guidance Notes
GSI Groundwater Flooding Data Viewer

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Geological Survey Ireland have developed Groundwater Flood Maps for the Republic of Ireland. The maps were developed in as part of the 2016-2019 GWFlood project in collaboration with Trinity College Dublin and the Institute of Technology Carlow.

Groundwater is the water that soaks into the ground from rain and can be stored beneath the ground. Groundwater floods occur when the water stored beneath the ground rises above the land surface.

The Historic Groundwater Flood Map shows the observed peak flood extents caused by groundwater in Ireland.

This map was made using satellite images (Copernicus Programme Sentinel-1), field data, aerial photos, as well as flood records from the past. Most of the data was collected during the flood events of winter 2015 / 2016, as in most areas this data showed the largest floods on record. The map is a vector dataset. Vector data portray the world using points, lines, and polygons (area). The floods are shown as polygons. Each polygon has info about the type of flood, the data source, and the area of the flood. The flood extents were calculated using data and techniques with various precision levels, and as such, it may not show the true historic peak flood extents.

Guidance Notes
GSI Groundwater Flooding Data Viewer

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Geological Survey Ireland have developed Groundwater Flood Maps for the Republic of Ireland. The maps were developed in as part of the 2016-2019 GWFlood project in collaboration with Trinity College Dublin and the Institute of Technology Carlow.

Groundwater is the water that soaks into the ground from rain and can be stored beneath the ground. Groundwater floods occur when the water stored beneath the ground rises above the land surface.

The Groundwater Flood Probability Maps shows the probabilistic flood extent of groundwater flooding in limestone regions. These maps are focussed primarily (but not entirely) on flooding at seasonally flooded wetlands known as turloughs. It should be noted that the predictive maps are limited to locations where the flood pattern was detectable and capable of being hydrologically modelled to a sufficient level of confidence.

The Groundwater Flooding Low Probability map shows the expected flood extent of groundwater flooding in limestone regions for annual exceedance probabilities (AEP’s) of 0.1%, which correspond with a return period of every 1000 years. The map was created using groundwater levels measured in the field, satellite images and hydrological models . The map is a vector dataset. Vector data portray the world using points, lines, and polygons (area). The floods are shown as polygons. Each polygon has info on the data source, and the area of the flood. The flood extents were calculated using remote sensing data and hydrological modelling techniques with various precision levels. As such, it should be used with caution.

Guidance Notes
GSI Groundwater Flooding Data Viewer

Layer Information
Geological Survey Ireland have developed Groundwater Flood Maps for the Republic of Ireland. The maps were developed in as part of the 2016-2019 GWFlood project in collaboration with Trinity College Dublin and the Institute of Technology Carlow.

Groundwater is the water that soaks into the ground from rain and can be stored beneath the ground. Groundwater floods occur when the water stored beneath the ground rises above the land surface.

The Groundwater Flood Probability Maps shows the probabilistic flood extent of groundwater flooding in limestone regions. These maps are focussed primarily (but not entirely) on flooding at seasonally flooded wetlands known as turloughs. It should be noted that the predictive maps are limited to locations where the flood pattern was detectable and capable of being hydrologically modelled to a sufficient level of confidence.

The Groundwater Flooding Medium Probability map shows the expected flood extent of groundwater flooding in limestone regions for annual exceedance probabilities (AEP’s) of 1%, which correspond with a return period of every 100 years. The map was created using groundwater levels measured in the field, satellite images and hydrological models. The map is a vector dataset. The floods are shown as polygons. Each polygon has info on the data source, and the area of the flood. The flood extents were calculated using remote sensing data and hydrological modelling techniques with various precision levels. As such, it should be used with caution.

Guidance Notes
GSI Groundwater Flooding Data Viewer

Layer Information
Geological Survey Ireland have developed Groundwater Flood Maps for the Republic of Ireland. The maps were developed in as part of the 2016-2019 GWFlood project in collaboration with Trinity College Dublin and the Institute of Technology Carlow.

Groundwater is the water that soaks into the ground from rain and can be stored beneath the ground. Groundwater floods occur when the water stored beneath the ground rises above the land surface.

The Groundwater Flood Probability Maps shows the probabilistic flood extent of groundwater flooding in limestone regions. These maps are focussed primarily (but not entirely) on flooding at seasonally flooded wetlands known as turloughs. It should be noted that the predictive maps are limited to locations where the flood pattern was detectable and capable of being hydrologically modelled to a sufficient level of confidence.

The Groundwater Flooding High Probability map shows the expected flood extent of groundwater flooding in limestone regions for annual exceedance probabilities (AEP’s) of 10%, which correspond with a return period of every 10 years. The map was created using groundwater levels measured in the field, satellite images and hydrological models. The map is a vector dataset. The floods are shown as polygons. Each polygon has info on the data source, and the area of the flood. The flood extents were calculated using remote sensing data and hydrological modelling techniques with various precision levels. As such, it should be used with caution.

Guidance Notes
GSI Groundwater Flooding Data Viewer

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These datasets show the detailed shoreline combined wave climate and water level conditions for the Coastal Areas Potentially Vulnerable to Wave Overtopping (CAPOs) that were included in Phase 3 of the Irish Coastal Wave and Water Level Modelling Study (ICWWS 2018) and from further Coastal Wave and Water Level Modelling Studies (CWWS) undertaken to inform the development of flood relief schemes. These studies provide an improvement and update to the wave climate and water level combinations of known Annual Exceedance Probability (AEP) presented as output from Phase 2 of the ICWWS 2018.

Detailed joint probability water level and wave climate condition tables have been produced for each CAPO for the present day scenario, Mid-Range Future Scenario (MRFS), High End Future Scenario (HEFS), High + End Future Scenario (H+EFS) and High++ End Future Scenario (H++EFS) which represent a 0.5m, 1.0m, 1.5m and 2.0m increase in sea level respectively. For each AEP from 50% to 0.1%, six combinations of wave climate and water level conditions were produced representing the complete joint probability range.

The outputs of these studies are considered suitable to inform the detailed evaluation of the risk associated with wave overtopping, any resulting coastal flooding (both now and in the future) and the detailed design of measures to mitigate and manage any such identified coastal flood risk.

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This dataset shows the shoreline combined wave climate and water level conditions for the Coastal Areas Potentially Vulnerable to Wave Overtopping (CAPOs) that were included in Phase 2 of the Irish Coastal Wave and Water Level Modelling Study (ICWWS 2018).

Joint probability water level and wave climate condition tables have been produced for each Phase 2 CAPO for the present day scenario, Mid-Range Future Scenario (MRFS), High End Future Scenario (HEFS), High+ End Future Scenario (H+EFS) and High++ End Future Scenario (H++EFS) which represent a 0.5m, 1.0m, 1.5m and 2.0m increase in sea level respectively. For each AEP from 50% to 0.1%, six combinations of wave climate and water level conditions were produced, representing the complete joint probability range.

The outputs of this study are considered suitable to inform the assessment of flood risk at a community level. The outputs of this study are NOT considered suitable to inform the assessment of flood risk to individual sites or properties, the detailed assessment of flood risk to existing coastal infrastructure, the detailed evaluation of the risk associated with wave overtopping, any resulting coastal flooding (both now and in the future) or for the detailed design of measures to mitigate and manage any such identified coastal flood risk.

View Irish Coastal Wave and Water Level Modelling Study 2018 Phase 2 - Coastal Areas Potentially Vulnerable to Wave Overtopping Technical Reports

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This dataset provides an estimate of extreme water levels around the coast of Ireland for a range of Annual Exceedance Probabilities (AEPs). Extreme water level estimates are provided for present day sea levels as well as the Mid-Range Future Scenario (MRFS), High End Future Scenario (HEFS), High+ End Future Scenario (H+EFS) and High++ End Future Scenario (H++EFS) which represent a 0.5m, 1.0m, 1.5m and 2.0m increase in sea level, respectively. This data is an update of the extreme water level estimation undertaken as part of the Irish Coastal Protection Strategy Study (ICPSS) between 2004 and 2013.

View Irish Coastal Wave and Water Level Modelling Study 2018 Phase 1 Technical Report

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The Coast of Ireland Survey was flown in September 2003 using aerial oblique digital video photography as part of the Irish Coastal Protection Strategy Study.

The purpose of the survey was to obtain a comprehensive and up to date record of the present coastal erosion situation around the entire coastline of Ireland in order to facilitate the identification of priority areas for future expenditure. The completed survey also provides a useful baseline for the preparation and commissioning of future surveys.

The survey commenced in mid-September 2003 and was completed in 11 days. The survey was undertaken from a helicopter, using a gyro-stabilised high quality digital camera system. The coastline was flown in an anti-clockwise direction beginning at Lough Foyle and ending at Carlingford Lough with photography generally restricted to three hours either side of the time of local low water.

The results of the survey are presented as a series of overlapping digital images of the coastline linked to interactive maps that enables the digital images of any particular section of the coastline to be examined as still images.

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Printable maps have been created for the predicted 2050 coastline.

The erosion maps have been produced for existing conditions only and do not include for projected future changes in climate such as sea level rise, increased storm frequency or associated variations in erosion rates.

The Irish Coastal Protection Strategy Study (ICPSS) erosion hazard mapping is for strategic purposes, and minor or local features may not have been included in their preparation. Therefore, the maps should not be used to assess the erosion hazard and risk associated with individual properties or point locations, or to replace a detailed local erosion hazard and risk assessment. It was not possible to eliminate the effect of existing coastal defence structures from the erosion hazard and risk assessment. Consequently, there will be areas where no erosion line is shown that are at risk from erosion, should present defences fail or not be maintained in the future. Equally, there may be an erosion line shown in areas that are now adequately defended by coastal protection structure that were introduced during or after the assessment period. Full details are available here.

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Printable maps have been created for the Present Day, Mid-Range Future Scenario (MRFS) and High End Future Scenario (HEFS) flood extents and the Present Day flood depths.

The Present Day Scenario is referred to as the Current Scenario in the maps and reports. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

The Mid-Range Future Scenario (MRFS) flood extents represent a projected future scenario for the year 2100 and include allowances for projected future changes in climate and glacial isostatic adjustment (GIA). An increase in mean sea level of 0.5m (to 2100) has been used in the MRFS. The allowance for GIA varies around the coastline and full details are available at the link below.

The High End Future Scenario (HEFS) flood extents represent a projected future scenario for the year 2100 and include allowances for projected future changes in climate and glacial isostatic adjustment (GIA). An increase in mean sea level of 1.0m (to 2100) has been used in the HEFS. The allowance for GIA varies around the coastline and full details are available at the link below.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

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This layer shows the predicted location of the coastline in 2050.

The erosion maps have been produced for existing conditions only and do not include for projected future changes in climate such as sea level rise, increased storm frequency or associated variations in erosion rates.

The Irish Coastal Protection Strategy Study (ICPSS) erosion hazard mapping is for strategic purposes, and minor or local features may not have been included in their preparation. Therefore, the maps should not be used to assess the erosion hazard and risk associated with individual properties or point locations, or to replace a detailed local erosion hazard and risk assessment. It was not possible to eliminate the effect of existing coastal defence structures from the erosion hazard and risk assessment. Consequently, there will be areas where no erosion line is shown that are at risk from erosion, should present defences fail or not be maintained in the future. Equally, there may be an erosion line shown in areas that are now adequately defended by coastal protection structures that were introduced during or after the assessment period. Full details are available here.

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This layer shows the coastline as digitised from the OSi colour aerial ortho-photography from 2000.

Full details are available here.

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This layer shows the modelled extent of land that might be flooded by the sea in a very extreme flood event.

Coastal flooding may also be referred to as tidal flooding in the maps and reports.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The Present Day Scenario is referred to as the Current Scenario in the maps and reports. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

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This layer shows the modelled extent of land that might be flooded by the sea in a severe flood event.

Coastal flooding may also be referred to as tidal flooding in the maps and reports.

Medium Probability flood events have approximately a 1-in-a-200 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5%.

The Present Day Scenario is referred to as the Current Scenario in the maps and reports. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a very extreme flood event.

Coastal flooding may also be referred to as tidal flooding in the maps and reports.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The Mid-Range Future Scenario (MRFS) flood extents represent a projected future scenario for the year 2100 and include allowances for projected future changes in climate and glacial isostatic adjustment (GIA). An increase in mean sea level of 0.5m (to 2100) has been used in the MRFS. The allowance for GIA varies around the coastline and full details are available at the link below.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a severe flood event.

Coastal flooding may also be referred to as tidal flooding in the maps and reports.

Medium Probability flood events have approximately a 1-in-a-200 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5%.

The Mid-Range Future Scenario (MRFS) flood extents represent a projected future scenario for the year 2100 and include allowances for projected future changes in climate and glacial isostatic adjustment (GIA). An increase in mean sea level of 0.5m (to 2100) has been used in the MRFS. The allowance for GIA varies around the coastline and full details are available at the link below.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a very extreme flood event.

Coastal flooding may also be referred to as tidal flooding in the maps and reports.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The High End Future Scenario (HEFS) flood extents represent a projected future scenario for the year 2100 and include allowances for projected future changes in climate and glacial isostatic adjustment (GIA). An increase in mean sea level of 1.0m (to 2100) has been used in the HEFS. The allowance for GIA varies around the coastline and full details are available at the link below.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a severe flood event.

Coastal flooding may also be referred to as tidal flooding in the maps and reports.

Medium Probability flood events have approximately a 1-in-a-200 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5%.

The High End Future Scenario (HEFS) flood extents represent a projected future scenario for the year 2100 and include allowances for projected future changes in climate and glacial isostatic adjustment (GIA). An increase in mean sea level of 1.0m (to 2100) has been used in the HEFS. The allowance for GIA varies around the coastline and full details are available at the link below.

The Irish Coastal Protection Strategy Study (ICPSS) flood hazard mapping is for strategic purposes, and any defence works potentially protecting the coastal floodplain are not taken into account. This means that areas may be shown to flood, even though at present a flood defence is protecting them. In addition, the flood extent mapping only takes into account coastal flooding from a combination of tide levels and storm surges; any significant impact from other sources (wave overtopping, fluvial, sewers, etc.) is not accounted for and needs to be considered separately. Full details are available here.

Expand this section to see community/afa level measures at the selected location.

Measures at this level are measures aimed at managing or reducing flood risk in a particular community. These measures are typically structural flood relief works, such as flood defence walls or embankments, works to improve channel conveyance or the storage or diversion of flood flows.

Expand this section to see catchment level measures at the selected location.

Measures at this level are aimed at managing or reducing flood risk in more than one community. These measures may be structural measures such as flood storage reservoirs than can reduce flood flows in a number of communities downstream, or non-structural measures such as flood forecasting systems that can help people and agencies in communities around the catchment prepare for an imminent flood.

Expand this section to see national measures under consideration at the selected location.

Measures at this level are policies and other works aimed at, or related to, reducing flood risk throughout the River Basin (e.g., spatial planning, emergency response planning and maintenance of drainage schemes), including properties outside of the communities at potentially significant risk (the 'AFAs').

Awaiting Text
Under Development...

The Flood Maps have been developed from detailed engineering analysis and modelling. There is always some uncertainty with regard to the accuracy of predictive flood models; however, the detailed models used have been developed using the best available modelling techniques, tools and data at the time of production.

The OPW is committed to providing the best available flood risk information to as wide an audience as possible. Updates and revisions to the Flood maps will be prepared as appropriate.

We welcome requests to review and update the Flood Maps, which can be submitted using the Flood Map Review Request Form. Further information can be found in the Flood Map Review Guidance Note.

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The Office of Public Works (OPW) is responsible for leading and co-ordinating the implementation of localised flood relief schemes to provide flood protection for cities, towns and villages, either directly or in association with relevant Local Authorities. This data outlines the areas benefiting from such flood relief schemes, the date of completion, the design standard and any human intervention that is required. A Benefitting Area is defined as the area that benefits from the implementation of the measures within an Option or Scheme, including improvements to conveyance such as channel widening or deepening, and culvert upgrades.

In 2014, the OPW agreed a Memorandum of Understanding (MOU) with Insurance Ireland, the representative body for insurance companies in Ireland. The MOU has a specific focus on agreeing the basis on which information can be provided to the insurance industry on areas benefitting from flood relief schemes completed by the OPW.

Under the terms of the MOU, Insurance Ireland requires the OPW to provide it with data on OPW completed flood defence schemes which shows the design, extent and nature of the protections offered by these works. The OPW requires that insurers, who are party to the agreement, take full account of the information provided by the OPW when assessing exposure to flood risk for private dwellings and small businesses.

Memorandum Of Understanding Between OPW and Insurance Ireland

Layer Information
This layer shows the modelled extent of land that might be directly flooded by rainfall in an extremely severe rainfall event.

Rainfall flooding is referred to as Pluvial flooding in the Maps and Plans.

Low Probability flood events have an indicative 1-in-a-200 chance (Dublin) or 1-in-a-1000 (Raphoe, Co. Donegal) of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5% or 0.1%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

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This layer shows the modelled extent of land that might be directly flooded by rainfall in a severe rainfall event.

Rainfall flooding is referred to as Pluvial flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-100 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 1%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

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This layer shows the modelled extent of land that might be directly flooded by rainfall in a moderate rainfall event.

Rainfall flooding is referred to as Pluvial flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

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This layer shows the modelled extent of land that might be flooded by rivers in a very extreme flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The Mid-Range Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 20% and sea level rise of 500mm (20 inches)

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This layer shows the modelled extent of land that might be flooded by rivers in a severe flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-100 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 1%.

The Mid-Range Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 20% and sea level rise of 500mm (20 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by rivers in a moderate flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The Mid-Range Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 20% and sea level rise of 500mm (20 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by rivers in a very extreme flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The High-End Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 30% and sea level rise of 1,000 mm (40 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by rivers in a severe flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-100 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 1%.

The High-End Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 30% and sea level rise of 1,000 mm (40 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by rivers in a moderate flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The High-End Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 30% and sea level rise of 1,000 mm (40 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by rivers in a severe flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-100 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 1%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

Layer Information
This layer shows the modelled extent of land that might be flooded by rivers in a moderate flood event.

River flooding is referred to as Fluvial flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a very extreme flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a severe flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-200 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a moderate flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a very extreme flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The Mid-Range Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 20% and sea level rise of 500mm (20 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a severe flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-200 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5%.

The Mid-Range Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 20% and sea level rise of 500mm (20 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a moderate flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The Mid-Range Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 20% and sea level rise of 500mm (20 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a very extreme flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

Low Probability flood events have an indicative 1-in-a-1000 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.1%.

The High-End Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 30% and sea level rise of 1,000 mm (40 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a severe flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

Medium Probability flood events have approximately a 1-in-a-200 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 0.5%.

The High-End Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 30% and sea level rise of 1,000 mm (40 inches)

Layer Information
This layer shows the modelled extent of land that might be flooded by the sea in a moderate flood event.

Coastal flooding may also be referred to as Tidal flooding in the Maps and Plans.

High Probability flood events have approximately a 1-in-a-10 chance of occurring or being exceeded in any given year. This is also referred to as an Annual Exceedance Probability (AEP) of 10%.

The High-End Future Scenario extents where generated taking in in the potential effects of climate change using an increase in rainfall of 30% and sea level rise of 1,000 mm (40 inches)

Layer Information
Printable maps have been produced for the 300 communities (AFA’s) at potentially significant flood risk from one or more sources of flooding. Each community was divided into one or more map tiles depending on area, and maps were produced for each tile.

A number of maps were produced for each tile to identify the extent and depth of flooding and the risk arising from flooding. Separate maps were typically produced for each source of flooding relevant to the community.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change. The potential effects of climate change have been separately modelled and reported on.

View Map User Guidance Notes Opens in new window for further details

Layer Information
Printable maps have been produced for the Dublin and Raphoe to show the potentially significant flood risk from rainfall (pluvial) source of flooding. These areas were divided into one or more map tiles depending on area, and maps were produced for each tile.

A number of maps were produced for each tile to identify the extent and depth of flooding and the risk arising from flooding.

The Present Day scenario is referred to as the Current Scenario in the Maps and Plans. The Present Day maps were generated using methodologies based on historic flood data, without taking account of potential changes due to climate change.

View Map User Guidance Notes Opens in new window for further details

Past Flood Event
A Past Flood Event is defined as the occurrence of recorded flooding at a given location on a given date or on a recurring basis. The event is derived from available flood information documentation including flood event reports, news articles, archive information and photos.

Past Flood Event Locations
Past flood events are represented on the map in three different ways. Where the boundary of a flood has been mapped, the flood is shown as a shaded area with a blue border defining the extent of the flood. Most floods cannot be shown in this way because the extent of the flood was not mapped at the time. Therefore, floods without extent information are represented with a point symbol at the approximate location of the flood. A flood point symbol is placed at any location mentioned in a report giving details of a flood event. Where more than one flood has occurred in the same location, and to denote a location with recurring flooding, a multiple flood point symbol is used.

To get more information, such as flood event reports or photos where available, regarding these events click on the flood point/boundary symbol which will bring up a “Flood Summary” pop-up in which the information available regarding that flood event is summarised and further information can be accessed.

Flood boundary marks the approximate extent of a past flood.
The Flood Point symbol marks the approximate location of a past flood.
A Multiple / Recurring Flood Point symbol marks the approximate location of an area that has been affected by more than one Flood Event.

View Past Flood Events User Guidance Notes Opens in new window for further details.

Layer Information
The Embankments layer identifies the embankments that form part of Land Commission Embankments.

The Land Commission took over a number of embankments as part of it's work. These embankments were created by landowners to reclaim land from rivers or the sea, typically in the 19th century.

The purpose of the embankments was to create land for agriculture. In some cases embankments were created and the area behind was allowed to flood and flush out a number of times to reduce the salt content of the soil. The Minister and Land Commission were exempted from any responsibility for maintenance of land sold by the Land Commission under Section 10 of the Land Act, 1965, and this responsibility falls on the current landowners, in line with the provisions of the Land Acts.

The OPW carried out a survey of these embankments in 1939 and 1940 as part of the work of the Browne Commission. Part IV of the Arterial Drainage Act, 1945 created a provision for embankments to be absorbed into drainage schemes. The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

Layer Information
The Benefited land layer identifies areas reclaimed by Land Commission Embankments.

The Land Commission took over a number of embankments as part of it's work. These embankments were created by landowners to reclaim land from rivers or the sea, typically in the 19th century.

The purpose of the schemes was to create land for agriculture. In some cases embankments were created and the area behind was allowed to flood and flush out a number of times to reduce the salt content of the soil. The Minister and Land Commission were exempted from any responsibility for maintenance of land sold by the Land Commission under Section 10 of the Land Act, 1965, and this responsibility falls on the current landowners, in line with the provisions of the Land Acts.

The OPW carried out a survey of these embankments in 1939 and 1940 as part of the work of the Browne Commission. Part IV of the Arterial Drainage Act, 1945 created a provision for embankments to be absorbed into drainage schemes. The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

Layer Information
The Channels layer identifies the watercourses forming part of Drainage Districts.

Drainage Districts were carried out by the Commissioners of Public Works under a number of drainage and navigation acts from 1842 to the 1930s to improve land for agriculture and to mitigate flooding. Channels and lakes were deepened and widened, weirs removed, embankments constructed, bridges replaced or modified and various other work was carried out.

The purpose of the schemes was to improve land for agriculture, by lowering water levels during the growing season to reduce waterlogging on the land beside watercourses known as callows.

Drainage Districts cover approximately 10% of the country, typically the flattest areas.

Local authorities are charged with responsibility to maintain Drainage Districts. The Arterial Drainage Act, 1945 contains a number of provisions for the management of Drainage Districts in Part III and Part VIII of the act.

The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

Layer Information
The Embankments layer identifies the embankments that form part of Drainage Districts. Embankments are walls of soil or sods that were erected to prevent flood water or high tides from entering land. Drains and sluices or pumps were also provided to take away rainwater that fell behind the embankments.

Drainage Districts were carried out by the Commissioners of Public Works under a number of drainage and navigation acts from 1842 to the 1930s to improve land for agriculture and to mitigate flooding. Channels and lakes were deepened and widened, weirs removed, embankments constructed, bridges replaced or modified and various other work was carried out.

The purpose of the schemes was to improve land for agriculture, by lowering water levels during the growing season to reduce waterlogging on the land beside watercourses known as callows.

Drainage Districts cover approximately 10% of the country, typically the flattest areas.

Local authorities are charged with responsibility to maintain Drainage Districts. The Arterial Drainage Act, 1945 contains a number of provisions for the management of Drainage Districts in Part III and Part VIII of the act.

The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

Layer Information
The Benefited land layer identifies land that was drained as part of the Drainage District. The original maps also identified other land owned by the same landowner so as to calculate the appropriate charge for maintenance.

Drainage Districts were carried out by the Commissioners of Public Works under a number of drainage and navigation acts from 1842 to the 1930s to improve land for agriculture and to mitigate flooding. Channels and lakes were deepened and widened, weirs removed, embankments constructed, bridges replaced or modified and various other work was carried out.

The purpose of the schemes was to improve land for agriculture, by lowering water levels during the growing season to reduce waterlogging on the land beside watercourses known as callows.

Drainage Districts cover approximately 10% of the country, typically the flattest areas.

Local authorities are charged with responsibility to maintain Drainage Districts. The Arterial Drainage Act, 1945 contains a number of provisions for the management of Drainage Districts in Part III and Part VIII of the act.

The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention

Layer Information
The Channels layer identifies the watercourses forming part of Arterial Drainage Schemes.

Arterial Drainage Schemes are schemes the OPW has a statutory duty to maintain.

Arterial Drainage Schemes were carried out under the Arterial Drainage Act, 1945 to improve land for agriculture and to mitigate flooding. Rivers , lakes weirs and bridges were modified to enhance conveyance, embankments were built to control the movement of flood water and various other work was carried out under Part II of the Arterial Drainage Act, 1945. The purpose of the schemes was to improve land for agriculture, to ensure that the 3 – year flood was retained in bank this was achieved by lowering water levels during the growing season to reduce waterlogging on the land beside watercourses known as callows. Flood protection in the benefiting lands was increased as a result of the Arterial Drainage Schemes.

The Brosna (Westmeath, Offaly and Laois) was the first scheme, which commenced in 1947. The last schemes were completed in the 1990s. Arterial Drainage schemes cover approximately 20% of the country, typically the flattest areas. The OPW is required to maintain Arterial Drainage schemes under sections 37 and 38 of the Arterial Drainage Act, 1945. The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

Layer Information
The Embankments layer identifies the embankments that form part of Arterial Drainage Schemes. Embankments are walls of soil or sods that were erected to prevent flood water or high tides from entering land. Drains and sluices or pumps were also provided to take away rainwater that fell behind the embankments.

Arterial Drainage Schemes are schemes the OPW has a statutory duty to maintain.

Arterial Drainage Schemes were carried out under the Arterial Drainage Act, 1945 to improve land for agriculture and to mitigate flooding. Rivers , lakes weirs and bridges were modified to enhance conveyance, embankments were built to control the movement of flood water and various other work was carried out under Part II of the Arterial Drainage Act, 1945. The purpose of the schemes was to improve land for agriculture, to ensure that the 3 – year flood was retained in bank this was achieved by lowering water levels during the growing season to reduce waterlogging on the land beside watercourses known as callows. Flood protection in the benefiting lands was increased as a result of the Arterial Drainage Schemes.

The Brosna (Westmeath, Offaly and Laois) was the first scheme, which commenced in 1947. The last schemes were completed in the 1990s. Drainage schemes cover approximately 20% of the country, typically the flattest areas. The OPW is required to maintain drainage schemes under sections 37 and 38 of the Arterial Drainage Act, 1945. The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

Layer Information
The Benefited land layer identifies land that was drained as part of the scheme. Bogland and other lands are identified separately. In the early schemes, large areas of bog were drained which facilitated peat extraction for fuel and horticulture.

Arterial Drainage Schemes are schemes OPW has a statutory duty to maintain.

Arterial Drainage Schemes were carried out under the Arterial Drainage Act, 1945 to improve land for agriculture and to mitigate flooding. Rivers , lakes weirs and bridges were modified to enhance conveyance, embankments were built to control the movement of flood water and various other work was carried out under Part II of the Arterial Drainage Act, 1945. The purpose of the schemes was to improve land for agriculture, to ensure that the 3 – year flood was retained in bank this was achieved by lowering water levels during the growing season to reduce waterlogging on the land beside watercourses known as callows. Flood protection in the benefiting lands was increased as a result of the Arterial Drainage Schemes.

The Brosna (Westmeath, Offaly and Laois) was the first scheme, which commenced in 1947. The last schemes were completed in the 1990s. Drainage schemes cover approximately 20% of the country, typically the flattest areas. The OPW is required to maintain drainage schemes under sections 37 and 38 of the Arterial Drainage Act, 1945. The Act was amended on a number of occasions, e.g. to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention.

The proper application of the Guidelines on the Planning System and Flood Risk Management (DECLG/OPW, 2009) by the planning authorities is essential to avoid inappropriate development in flood prone areas, and hence avoid unnecessary increases in flood risk into the future. The flood mapping produced through the CFRAM Programme will provide an even greater evidential basis for sustainable planning decisions.

In accordance with the Guidelines on the Planning System and Flood Risk Management (DECLG/OPW, 2009), planning authorities should seek to reduce the extent of hard surfacing and paving and require the use of sustainable drainage techniques to reduce the potential impact of development on flood risk downstream.

Following approval of the Climate Change Adaptation Framework key sectors and Local Authorities are required to develop sectoral and local adaptation plans. This will require a revised sectoral plan to be prepared by the OPW, covering the flood risk management sector. Other sectors identified in the Framework and Local Authorities will also be required to take account of flood risk when preparing their own sectoral and local adaptation plans.

The OPW will work with the Environment Protection Agency, Local Authorities and other agencies during the project-level assessments of physical works and more broadly at a catchment-level to identify any measures, such as natural water retention measures (such as restoration of wetlands and woodlands), that can have benefits for Water Framework Directive, flood risk management and biodiversity objectives.

Outside of the Arterial Drainage and Drainage District Schemes, landowners who have watercourses on their lands have a responsibility for their maintenance. Guidance to clarify the rights and responsibilities of landowners in relation to the maintenance of watercourses on or near their lands is available at www.flooding.ie .

A Government decision was taken on 5 January 2016 to establish a National Flood Forecasting and Warning Service. The service will deal with flood forecasting from fluvial (river) and coastal sources and when fully operational will involve the issuing of flood forecasts and general alerts at both national and catchment scales. A 5-year programme has been agreed to oversee the establishment of this new service.

A Government Task Force on Emergency Planning is currently drafting a Strategic Emergency Management (SEM): National Structures and Framework document. This is to include a Chapter on Recovery to include how funding for emergencies, particularly recovery costs, may be handled in the future.

The Department of Housing, Planning & Local Government (DHPLG) is researching how Community Resilience may be advanced as part of the overall review of the Framework of Major Emergency Management.

The outcomes of two Individual Property Protection (IPP) pilots currently underway will inform the Government on any feasible support it could provide to at risk properties.

The ongoing collection and, where appropriate, publication of flood-related data will help to continually improve preparation for, and response to, flooding.

In extreme circumstances, a homeowner may consider that continuing to live in the property at risk of flooding is not sustainable and would choose to relocate. On 11 April 2017, the Government agreed the administrative arrangements for a once-off Homeowners Voluntary Relocation Scheme for those primary residential properties that flooded during 4 December 2015 to 13 January 2016.

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An area of land (catchment) draining to a particular estuary or reach of coastline.

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Areas where, based on the Preliminary Flood Risk Assessment, the risks associated with flooding are considered to be potentially significant. For these areas further, more detailed assessment was required to determine the degree of flood risk, and develop measures to manage and reduce the flood risk. The AFAs were the focus of the CFRAM Studies.

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Progression of a Flood Forecasting and Warning System for the Boyne (UoM07) River Basin, comprising of gauging stations (existing and new) and a forecasting model system, to project-level development and assessment for refinement and preparation for planning / Exhibition and, as appropriate, implementation. The development of a flood forecasting system for the Boyne River Basin will progress as part of the development of the National Flood Forecasting Service.

See full Flood Risk Management Plan for further details

Currently there are three agencies with a statutory interest in the water levels along the River Shannon; namely the OPW, ESB and Waterways Ireland (WI). A background to these agencies and their statutory responsibilities for the River Shannon is provided in the River Shannon Level Operation Review, which is available to download at www.opw.ie/FloodPlans.

The water levels on the three lakes (Lough Allen, Lough Ree and Lough Derg) are controlled and managed by the ESB. The levels of Lough Derg are managed for the purpose of electricity generation. Levels in Lough Allen and Lough Ree are managed to ensure minimum navigation levels in the river during dry periods and to reduce the impacts of floods as far as reasonably possible. The levels of the navigation channel in between the lakes are managed by Waterways Ireland.

The management of water levels for the purpose of reducing flood risk must take into account the existing statutory minimum operating levels, the potential impacts on the environment, water supply and waterway infrastructure (both private and public) and the avoidance of causing downstream flooding.

The OPW, ESB and WI are working together, through the Shannon Flood Risk State Agency Co-ordination Working Group to build on the existing co-ordination of water level management activities and to trial the lowering of the lake levels in Lough Allen to help mitigate potential flood risk during Winter months.

See full Flood Risk Management Plan for further details

The ESB owns, maintains and operates a range of infrastructure along the River Shannon related to power generation at Ardnacrusha hydro-power station. Waterways Ireland owns, maintains and operates further infrastructure, such as weirs and some navigation canals, related to navigation on the River Shannon. It is important for the avoidance of increased flood risk that this infrastructure is operated according to the relevant regulations and is maintained in good working order into the future.

See full Flood Risk Management Plan for further details

Further studies to determine the natural channel restrictions, in the vicinity of Banagher, most influencing Summer flood levels along with ecological surveys and assessment to determine the potential environmental impacts (with particular regard to the requirement of the Habitats Directive) of improving conveyance at these restrictions, a design of such works and the whole life cost.

The OPW and Waterways Ireland are working together, through the Shannon Flood Risk State Agency Co-ordination Working Group, to examine the potential to lower the navigation channel to improve conveyance. Any works that may be proposed following the necessary ecological and engineering studies will be subject to the relevant consent processes including environmental.

See full Flood Risk Management Plan for further details

The proposed measure consists of hard defences and improvement of channel conveyance. At risk properties affected by the River Finn and on the tributaries where it has been found to be the lowest cost option would be protected by a series of flood embankments and walls. These Hard Defences would protect to the 1% AEP flood event with an average height of 1.66m and a total length of 687m. At risk properties on the tributaries where Improvement of Channel Conveyance was found to be the lowest cost method will be protected by widening and lowering of the watercourse where restrictions are causing out of bank flooding.

See full Flood Risk Management Plan for further details

Flood protection to parts of Ballybofey / Stranorlar is being provided by some existing embankments that were constructed to provide protection to agricultural land, and that were not constructed to the modern engineering standards that would be applied now when providing urban flood protection. A detailed geotechnical structural and stability assessment of the existing embankments was not undertaken as part of the CFRAM study, but should be undertaken to determine the condition and stability of tese embankments, and what remedial or maintenance works might be required.

See full Flood Risk Management Plan for further details

The FEM-FRAMS was initiated in 2008 and included assessment of Laytown, Bettystown and accompanying coastal areas. A flood risk assessment was completed and a flood relief scheme proposed for the Laytown area. The Scheme, which comprises, construction of hard defences (embankments & flood walls), is expected to provide protection against an estimated 100-Year fluvial flood (1% Annual Exceedance Probability) and a 200-Year flood (0.5% Annual Exceedance Probability) tidal event for 11 properties.

See full Flood Risk Management Plan for further details

The Northlands Flood Relief Scheme was initiated in 2013 following major flooding in 2008 and 2012, and has been substantially completed. The Scheme, which comprises of flood defence walls and a non-return flap valve, provides protection against a 100-Year flood (1% Annual Exceedance Probability) for 27 properties against flooding from the Mornington stream and its tributary.

See full Flood Risk Management Plan for further details

The proposed further measure for Mornington that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls). These works would complement the existing flood scheme already completed in Mornington. The hard defences would protect to the 1% AEP fluvial flood event and to the 0.5% AEP coastal flood event, with an average height of 1.04m and a total length of approximately 530m.

See full Flood Risk Management Plan for further details

The Mornington Flood Relief Scheme, which comprises flood defence walls and embankments along the Mornington Stream and a pumping station upstream of Lady’s Finger Bridge, provides protection against a 100-Year fluvial flood (1% Annual Exceedance Probability) and a 200-Year tidal flood (0.5% Annual Exceedance Probability) for 162 properties

See full Flood Risk Management Plan for further details

The proposed measure for Carysfort Maretimo HPW that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of flood defence walls and five offline storage areas. The result is a reduced flow along the Carysfort Maretimo reducing the length and height of any hard defences required. The hard defences provide the additional protection against the 1% AEP fluvial flood event with an average and maximum height of 0.8m and 1.4m respectively and a total length of 250m.

See full Flood Risk Management Plan for further details

The work undertaken for the Dublin FloodResilienCity Project forms the basis of a Pluvial Flood Risk Management Strategy for Dublin. Ongoing development and implementation of this strategy will allow Dublin to continue to grow and realise its full potential as a ‘Flood Resilient City’ of the future. In doing so, and as part of a fully integrated strategy for all flood risks under the Dublin Flood Initiative, Dublin can act as an exemplar city in contributing to continual development of good practice in pluvial flood risk management as well as wider and integrated flood management practice in Europe. Please refer to 'http://www.dublincity.ie/main-menu-services-water-waste-and-environment-drains-sewers-and-waste-water/flood-prevention-plans' for further information.

See full Flood Risk Management Plan for further details

The Camac Flood Protection Project was initiated as part of the CFRAM process following major fluvial flooding in 1986 and 2011. It is currently at pre-feasibility stage following no apparent viable overall scheme emanating from the CFRAM process. The next step is to appoint a service provider in 2018 to review the CFRAM outputs and see if local options may be possible to reduce flood risk for approximatey 570 properties estimated to be at flood risk in a 100-Year flood (1% Annual Exceedance Probability).

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The Poddle Flood Protection Project was initiated as part of the CFRAM process following major fluvial flooding in 1986 and 2011. This project is roughly 2/3 in South Dublin and 1/3 in Dublin City Council hence SDCC will be the lead authority on it. A consultant is to be appointed early in 2018 to progress the project and bring the resulting project to planning stage. The Scheme, which comprises of flood defences walls and embankments, flood retention ponds and floodgates is designed to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 838 properties; in the two local authorities’ areas primarily against fluvial flooding.

See full Flood Risk Management Plan for further details

The Lower Dodder Flood Alleviation Scheme was initiated in 2012 following finalisation of the Dodder CFRAM Study and major flooding in August 1986 and October 2011, and commenced construction in 2012. It is expected that the Scheme will be completed to the Smurfit Weirs on Beaver Road in 2018. There is an estimated three years of works upstream of this. The Scheme, which comprises flood defence walls and embankments from Newbridge to Ballsbridge in the Dodder tidal region and further floodwalls and embankments upstream of these to the Smurfit weirs, will provide protection against a 200-Year flood (0.5% Annual Exceedance Probability) in the tidal region and 100 year flood (1% Annual Exceedance Probability) in the fluvial region above Ballsbridge for 938 properties against fluvial flooding with associated tidal influences.

See full Flood Risk Management Plan for further details

The Dodder CFRAM Study included an assessment of the Little Dargle Stream. A flood risk assessment was completed and a flood relief scheme proposed for the downstream extent of the watercourse close to its confluence with the Dodder. The Scheme, which comprises construction of flood embankments is expected to provide protection against an estimated 100-Year fluvial flood (1% Annual Exceedance Probability) for 2 properties.

See full Flood Risk Management Plan for further details

The Dodder CFRAM Study included an assessment of the St Endas and Tara Hill areas. A flood risk assessment was completed and a flood relief scheme proposed for the area. The Scheme, which comprises construction of hard defences, dredging and the removal of two weirs is expected to provide protection against an estimated 100-Year fluvial flood (1% Annual Exceedance Probability) for 165 properties.

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The South Campshires Flood Alleviation Scheme was initiated in 2007 following the major tidal flood events of February 2002, and commenced construction in November 2014 and has been completed. The Scheme comprises flood defence walls and flood gates on George’s Quay, City Quay and part of Sir John Rogerson’s Quay adjacent to the Liffey tidal estuary, provides protection against a 200-Year flood (0.5% Annual Exceedance Probability) in the tidal region for approximately 750 buildings.

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The Dodder Tidal Flood Alleviation Scheme was initiated in 2003 following a major tidal flooding event in February 2002. Emergency construction started immediately following this tidal flooding event and continued with new flood walls adjacent to Stella Gardens in 2003 and 2004. From September 2007 to 2013 flood alleviation works from Ringsend Bridge to Newbridge on the Dodder Estuary were constructed following Part VIII planning permission. The Scheme, which comprises mainly of flood defence walls and embankments, provides protection against a 200-Year flood (0.5% Annual Exceedance Probability) for an estimated 1,000 buildings in Dublin City from tidal flooding.

See full Flood Risk Management Plan for further details

The Wad River Flood Alleviation Scheme was initiated in 2009 following two major flood events in this catchment in August 2008 and July 2009. A third City wide event in October 2011 again caused significant flooding in this catchment. Phase 1A (the Clanmoyle Flood Alleviation Scheme) which comprised works in the Clontarf Golf Club and Clonmoyle Road areas has now been completed. The Scheme comprises of large drainage culverts, a large retention pond and flood flow control devices.

See full Flood Risk Management Plan for further details

The Spencer Dock Flood Relief Scheme was initiated in 2006 following major flooding in 2000, and was constructed from 2007 to 2009. The Scheme, that comprises the restoration of a sea lock, provides protection against a 100-Year flood (1% Annual Exceedance Probability) for 1,200 properties against flooding from the River Liffey.

See full Flood Risk Management Plan for further details

The Tolka Flood Alleviation Scheme was initiated in 2002 following a major tidal flooding event in February of that year and a major fluvial flooding event in November 2002, these had estimated return periods of 68 and 100 years. Emergency construction started immediately following the November 2002 event with the majority of the works completed between 2003 and 2009. Construction was undertaken within three local authority areas Meath, Fingal and Dublin City. Within Dublin City the scheme, comprises flood defence walls, embankments, channel conveyance improvements, a new raised bridge in Griffith Park and a pumping station adjacent to Drumcondra Bridge and Botanic Avenue for storm water that would otherwise accumulate behind the new defences. These works provide protection against a 100-Year flood (1% Annual Exceedance Probability) for an estimated 1,346 buildings in Dublin City against flood damage from mainly river flooding although a small number of these were at tidal flooding risk as well. This number was significantly increased during the 1954 flood when the railway bridge from Fairview Park to East Wall Road collapsed during this river flood. The vast majority of the Funding was provided by the Office of Public Works for this €20m scheme in three different counties

See full Flood Risk Management Plan for further details

The Carysfort Maretimo Stream Improvment Scheme was constructed between 2010 and 2012. The scheme, that comprised improved channel conveyance, raised wall, culvert bypasses and screen upgrades, provides protection against a 1:50 to 1:100 year flood event (1-2% Annual Exceedance Probability) for 40 plus properties, against flooding from the Carysfort Maretimo Stream.

See full Flood Risk Management Plan for further details

The Dollymount Cycletrack and Flood Alleviation Scheme commenced construction in March 2015. A phase of the Scheme was completed from Causeway Road to the Bull Island Wooden Bridge in Q2 2017. The Schem comprises flood defence walls a flood ramp and flood gates, will provide protection for an estimated 100 properties.

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The Clontarf Promenade Flood Protection Project was initiated in 2003 following major tidal flooding in 2002. It is currently at detailed feasibility stage with ongoing close consultations with local residents and businesses, and is expected to go to construction, subject to local buy in, in 2019 and be completed in 2021. The Scheme, that comprises tidal flood defences walls and floodgates as well as utilising the existing sea wall and 30-50m wide promenade, is expected to provide protection against a 200-Year flood (0.5% Annual Exceedance Probability) for 400 properties against flooding from high tides including associated waves.

See full Flood Risk Management Plan for further details

The Sandymount Flood Protection Project was initiated in 2003 following major tidal flooding in 2002. The sections at Merrion Gates and opposite Marine Drive have been constructed. Phase 1 involves new flood walls, raising existing flood sea wall, floodgates at entrances and repairing existing damaged sections along the 1.1km Promenade Section. Preliminary design has been carried out on this and consultation with local resident groups took place in July 2016. A Part VIII planning procedure has commenced with construction planned for Q2 2018. Phase 2 involves providing flood protection at the 700m section of sea walI north of the promenade to Sean Moore Park. The Scheme, that comprises of tidal flood defences walls, existing promenades, rock armour and floodgates as well as utilising existing and possibly future promenades, is designed to provide a 200-Year flood (0.5% Annual Exceedance Probability) standard of protection for over 1,000 properties against flooding from high tides including associated waves.

See full Flood Risk Management Plan for further details

The Wad River Flood Alleviation Scheme was initiated in 2009 following two major flood events in this catchment in August 2008 and July 2009. A third City wide event in October 2011 again caused significant flooding in this catchment. Dublin City Council (DCC) is currently preparing a request for funding to the Office of Public Works (OPW) for works on Phase 1B of the Wad River Flood alleviation scheme which will comprise works under the Howth Road and under Clontarf Promenade. When Phase 1B is complete DCC will make an application to OPW for funding to carry out a second phase of the Scheme along Collins Avenue East, Malahide Road and Collins Park. The total Scheme, which comprises of large drainage culverts, a large retention pond and flood flow control devices, will provide protection against an estimated current 100-Year fluvial flood (1% Annual Exceedance Probability) for approximately 206 buildings, as well as reducing flood risk to the Dublin to Belfast railway line, Howth Road, Malahide Road, Collins Avenue East and many local roadways in the Wad River Catchment.

See full Flood Risk Management Plan for further details

The North City Drainage Network Upgrades was initiated in 2010 following major flooding in August 2008 and July 2009 with construction subsequently commencing in 2012. The Scheme is ongoing, and analyses pure drainage network improvements or diversions of flood waters to neighbouring networks which have spare capacity to reduce local flood risk as much as possible. The benefit of each scheme is assessed on its merits and not all schemes can reach the level of protecting buildings (mainly dwellings) to the 1% AEP level. Approximately 2km of new drainage networks and collection systems have been put in place to date. Some of these schemes have involved private elements.

See full Flood Risk Management Plan for further details

The North City Pluvial Flood Alleviation Project was initiated in October 2008 following major pluvial flooding earlier that year and continued after another significant thunderstorm event in July 2009. Some of these areas which had never been flooded before, in living memory, flooded again in October 2011 each time to a previously estimated one in 100 year local flood level. From 2012 to the present large local flood water retention depressions (called swales as they are normally dry) have been constructed in Ashtown (2), Finglas, Cabra (2). These range in size from 500 cubic metres to over 3,000 cubic metres. When the drainage system is surcharged rainwater overflows into these storage areas and is released by gravity when the storm subsides and water levels in the drainage network abate. The local drainage network is also analysed and optimised to cater for this relatively new type of flooding. The solutions described above provide an estimated 100-year flood protection (1% AEP) to over 100 houses in these areas from the critical one hour to three-hour thunderstorm flood events. Part 8 planning and close liaison with residents is required for each local scheme.

See full Flood Risk Management Plan for further details

The proposed further measure for Leixlip that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls). The hard defences would protect to the 1% AEP fluvial flood event, with an average and maximum height of 1.2m and 2.1m respectively and a total length of 461m.

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The Leixlip Scheme was initiated in 2004 and was constructed from 2007 to 2010. The Scheme, comprises flood defence walls and embankments along the Rye Water and flood defence walls along the Silleachain river, provides protection against a 100-Year flood (1% Annual Exceedance Probability) for 50 properties against flooding from the Rye Water and Silleachain rivers.

See full Flood Risk Management Plan for further details

The proposed measure for Lucan to Chapelizod that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls). The hard defences would protect to the 1% AEP fluvial flood event with an average and maximum height of 1.2m and 2.9m respectively and a total length of 3.0km of wall and a total length of 2.1km of embankment

See full Flood Risk Management Plan for further details

The River Griffeen Flood Alleviation Scheme was initiated in 2003 following major flooding in 2000, and was constructed from 2003 to 2004. The Scheme, that provides protection to the 1 in 100 year Standard of Protection against flooding from the Griffeen River, comprised of: a) the lowering of the river bedrock in Lucan Village, b) the lowering of the horseshoe weir at Vesey Bridge, c) repointing and raising height of masonry pillars, and d) repointing and raising height of wall in Main Street Lucan. In addition to this Scheme, further developer led flood relief measures were completed along the watercourse.

See full Flood Risk Management Plan for further details

This option involves rehabilitating (i.e. strengthening and raising) 0.5km of existing walls which run alongside the R106 at Strand Road. The option also involves rehabilitating of the flapped gates on the Sluice River at Portmarnock Bridge and the construction of a flood embankment on the left bank of the Sluice River upstream of Portmarnock Bridge.The existing flood walls and their foundations would be strengthened using structural engineering works to allow walls to provide sufficient flood defence function up to the 0.5% AEP tidal event. The flapped gates on the Sluice River at Portmarnock Bridge prevent the propagation of high tides upstream of this bridge. These gates would be replaced with new flapped gates as part of this option. 120m of flood embankments are required upstream of Portmarnock Bridge. The average height of these embankments is 0.6m and provides protection up to the 1% AEP fluvial event and 0.5% AEP tidal event. Hydraulic modelling indicates that there is no impact on water levels upstream or downstream of Strand Road.

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The FEM FRAM Study included an assessment of the Malahide Town Centre area. A flood risk assessment was completed and a flood relief scheme proposed for the AFA. The Scheme, which comprises construction of demountable flood defences at the underpass along with localised embankments is expected to provide protection against an estimated 100-Year flood (1% Annual Exceedance Probability) in the fluvial region and the 200-Year flood (0.5% Annual Exceedance Probability) tidal event for 37 properties.

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The proposed further measure for Maynooth that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) and an overland flow route. The hard defences will provide a SoP of 1% AEP for fluvial flood events with an average and maximum height of 1.6m and 2.0m respectively and a total length of 350m. The overland flow route will be defined by 375m of hard defences with an average height of 0.8m.

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The Lyreen and Meadowbrook Flood Relief Scheme was initiated in 2001 following major flooding in November 2000 and was constructed from 2002 to 2003. The scheme works, included cleaning 4 kilometres of the Lyreen River channel and 1.6 kilometres of the Meadowbrook River channel, cleaning / repairing / replacing culverts, together with cleaning out aqueducts at Bond Bridge and Jackson’s Bridge. The scheme also provided trash screens and flap valves on channels, where appropriate, and repairing a damaged wall at Parsons Lane. The scheme provides increased flood protection for 30 properties against flooding from the Meadowbrook and Lyreen Rivers.

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The proposed measure for Naas that may be implemented after detailed assessment, including data collection and an assessment of potential non-fluvial sources, and then subsequent project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls), storage, formalisation of an existing flow path to create a flow diversion channel and improvement of channel conveyance. At risk properties would be protected by storage areas located in the upper catchment to attenuate flow on the Morell, Naas and Broadfield Rivers. Any combination of storage areas result in partial protection to properties and some hard defences (with an average and maximum height of 0.9m and 1.9m respectively) are still required to protect to the 1% AEP fluvial flood event. The location and volume of storage determine the locations and heights of hard defences required downstream, these issues will be considered at project-level assessment stage. Other at risk properties would be protected by a diversion of flow and improvement of channel conveyance.

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The Morrell Johnstown Flood Relief Scheme was initiated in 2002 and was constructed from 2010 to 2013. The Scheme, comprises flood defence walls and embankments along the Morell River, the Annagall Stream, the Tobenavoher Stream and the Hartwell River. The scheme also includes a new diversion channel from Forenaghts to the Morrell River. This scheme provides protection against 100-Year flood (1% Annual Exceedance Probability) for 25 properties against flooding from the Morell River, the Annagall Stream, the Tobenavoher Stream and the Hartwell River.

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The Raheny (Santry River) Flood Protection Project was initiated following major fluvial flooding in 1986, 2008, 2009 and 2011, and a first phase was constructed in 2013. A phase from the Malahide Road to Raheny Village is at design stage by Dublin City Council and, subject to funding, will progress to submission for planning approval. A third phase downstream of Raheny village is planned for construction thereafter again subject to funding and planning approval.

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The Raheny (Santry River) Flood Protection Project was initiated following major fluvial flooding in 1986, 2008, 2009 and 2011. The first phase was constructed in 2013 and comprised works to attenuate flood flows upstream of Harmonstown Road Bridge.

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The Raheny (Santry River) Flood Protection Project was initiated following major fluvial flooding in 1986, 2008, 2009 and 2011. A phase from the Malahide road to Raheny Village is at design stage by Dublin City Council and, subject to funding, will progress to submission for planning approval. A third phase downstream of Raheny village is planned for construction thereafter again subject to funding and planning approval. The full Scheme, when completed, will comprise of flood defences walls and embankments and flood retention ponds is designed to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 28 properties in the Dublin City area primarily against fluvial flooding.

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The Morrell River (Turnings Area) Flood Relief Scheme was initiated in 2001 following major flooding in November 2000, and was constructed from 2002 to 2003. The scheme works included construction of extra flow capacity to three bridges and the replacement of a further bridge. Embankments were also constructed along some of this reach. These works increased the capacity of the River Morell as far as its confluence with the River Liffey and provided flood attenuation to 10 properties against flooding from the Morrell River.

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The Lower Morrell (Straffan) Flood Relief Scheme was initiated in 2010 following major flooding in 2009. It is currently at planning / detail design stage, and is expected to go to construction in 2018. The Scheme, that comprises of embankments and flood defence walls along the Morrell and Painstown Rivers, is expected to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 36 properties and the M7 motorway against flooding from the Morrell and Painstown Rivers

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The level of risk in Hazelhatch may be considered to be low, with 4 properties identifed within the 1%AEP extent. However, there is a history of extensive flooding, which could not be replicated in the CFRAM Study Mapping. It is possible that mechanisms that were outside the scope of the CFRAM study, such as pluvial and/or groundwater flooding or interactions with the canal, are a factor. Further study and data collection are recommended.

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The Shinkeen (Hazelhatch) Scheme was initiated in 1999 and was constructed from 2001 to 2002. The Scheme, comprised channel widening and deepening along the Shinkeen stream and provides protection against a 100-Year fluvial flood (1% Annual Exceedance Probability) for 26 properties.

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The River Dargle (Bray) Drainage Scheme commenced construction in May 2012, and was completed in 2017. The Scheme, that comprises widening and deepening of the river channel, the construction of walls, embankments and culverts, underpinning of Bray Bridge, river regrading, soil nailing and erosion protection, provides protection against a 100-Year flood (1% Annual Exceedance Probability) for fluvial flooding and a 200-Year flood (0.5% Annual Exceedance Probability) against tidal flooding for 658 properties.

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The Old Connaught scheme was constructed in 2015. The scheme, that comprised a new culvert bypass, provides protection against a 1:100 year flood event (1% Annual Exceedance Probability) for 10 plus properties, against flooding from the Old Connaught Stream.

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The proposed further measure consists of building hard defences, at risk properties would be protected by a series of flood embankments on the Burrin River and on the Knocknagee Stream in the Castle Oaks area. These hard defences would protect to the 1% AEP fluvial flood event with an estimated average height of 1.1m and a total length of 276m.

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The Carlow Flood Relief Scheme was initiated in 1996 following severe flooding in 1995 and was constructed from 2010 to 2013. The Scheme, which comprises flood defence walls and embankments along the River Barrow and Burren Stream with a pumping station at their confluence, provides protection against a 100-Year flood (1% Annual Exceedance Probability) for 185 properties.

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The proposed measure consists of building hard defences, at risk properties would be protected by a series of embankments and walls, sheet piled where necessary and set back where possible from the river channel. These hard defences would protect properties from the 1% AEP fluvial event and with estimated an average height of 1.56m and a total length of 1.31km.

In addition there is a Community Resilience Pilot Scheme on-going for Graiguenamanagh, to progress flood alert and community flood response schemes. This scheme is intended to facilitate a community based response to flood events by improving the resilience and preparedness of the local community. The scheme includes consideration of the provision of an early flood warning system and flood barriers for individual property protection in Graiguenamanagh. The pilot study includes a detailed building survey to identify all potential flow paths through the affected properties and the type of foundation and floor in affected property along with other factors which may affect the viability of any proposed measures.

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In addition to the proposed option identified through the CFRAM study, the Graiguenamanagh & Thomastown Community Resilience Pilot Scheme was initiated in 2015. The feasibility report for the pilot IPP schemes is finalised and the matter of progressing with the pilot schemes in the towns is under review in light of the Plan's proposed viable permanent defence schemes for the towns and the on going work to develop a national policy on IPP

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A flood relief scheme has been implemented for Leighlinbridge AFA. In addition to the maintenance of the existing scheme, additional measures are required to ensure full protection is provided. The proposed measure consists of augmenting the existing defences with the construction of embankments, walls set back from the river where possible and the installation of automatic flood gates. The new hard defences would protect to the 1% AEP flood event with an estimated average height of 1.2m and a total length of 1.1km.

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The flood alleviation works at Leighlinbridge were initiated in 2010 following flooding in 2009 which overwhelmed existing defences, and were constructed from 2011 to 2012. The Scheme, that comprises a storm water pumping station, flood defence walls, flood defence gates and embankments provides circa 1 in 100-Year flood protection (1% Annual Exceedance Probability) for 37 properties.

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The Callan Minor Works Flood Relief Scheme was initiated in 2008 following a major flood event in 2004. It was constructed from 2011 to 2012. The Scheme, that comprises flood defence walls, embankments, and a pumping station for storm water that would otherwise accumulate behind the defences, provides protection against empirically observed flood levels for 22 properties along the Kings River.

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The proposed measure consists of building hard defences, at risk properties would be protected by embankments and walls, sheet piled where necessary and set back where possible from the river channel. These hard defences would protect properties from the 1% AEP fluvial event and with an estimated average height of 1.9m and a total length of 2.7km. It is important to note that the measures set out in the Plan are not definitive and final, and that as part of the project-level assessment that is required to prepare the measure for planning / Public Exhibition, then more detailed assessments are required at a local level and further public and stakeholder consultation will be undertaken. As such, there is further scope for the community views to influence the measure that is progressed to implementation.

In addition there is a Community Resilience Pilot Scheme for Thomastown, to progress flood alert and community flood response measures. This scheme is intended to facilitate a community based response to flood events by improving the resilience and preparedness of the local community. The scheme includes consideration of the provision of an early flood warning system and flood barriers for individual property protection in Thomastown. The scheme development includes a detailed building survey to identify all potential flow paths through the affected properties. The survey will also consider the type of foundation and floor in the property along with other factors which may affect the viability of any proposed measures.

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In addition to the proposed option identified through the CFRAM study, the Graiguenamanagh & Thomastown Community Resilience Pilot Scheme was initiated in 2015. The feasibility report for the pilot IPP schemes is finalised and the matter of progressing with the pilot schemes in the towns is under review in light of the Plan's proposed viable permanent defence schemes for the towns and the on going work to develop a national policy on IPP

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It is recommended that a gauge is installed on the water course on the Anner tributary in the Mullinahone AFA. Due to the complex hydraulic processes in this AFA additional data would contribute to improving the accuracy of the current hydraulic model.

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In April/May 2000, flood alleviation works were undertaken by the local community in Mullinahone, funded by the OPW through South Tipperary County Council. Flooding in Dec 2015/Jan 2016 resulted in some bank erosion and debris being washed into the channel. In March 2017, Tipperary County Council secured further funding via OPW's minor works programme to reduce the risk of flooding to 14 properties. These works were completed in late 2017 and involved the removal of debris from the channel and banks, to make safe prior to building a foundation and retaining wall along the banks.

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The proposed measure for Youghal that may be implemented after project-level assessment and planning or Exhibition and confirmation might include Monitoring and Flood Defences. Tidal monitoring to be carried out in advance of any mitigation works to review and determine the design tide plus surge level. Tidal flood Defences along the quays and to the rear of properties comprising of sea walls, removable barriers / gates are included at certain locations to maintain existing access points along with storm water pump stations. These Flood Defences are expected to provide protection against the 0.5% AEP tidal flood event.

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The proposed measure for Youghal that may be implemented after project-level assessment and planning or Exhibition and confirmation might include Monitoring and Flood Defences. Tidal monitoring to be carried out in advance of any mitigation works to review and determine the design tide plus surge level. Tidal flood Defences along the quays and to the rear of properties comprising of sea walls, removable barriers / gates are included at certain locations to maintain existing access points along with storm water pump stations. These Flood Defences are expected to provide protection against the 0.5% AEP tidal flood event.

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The Blackpool Flood Relief Scheme was initiated in 2013 following major flooding in 2012. It is currently at the Detailed Design stage, and is expected to go to construction in 2018. The Scheme, which comprises conveyance improvement, Flood Defence embankments and walls, and pumping stations is expected to provide protection against the 100-Year flood (1% Annual Exceedance Probability) for about 285 properties from the River Bride.

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The Lower Lee Flood Relief Scheme was initiated in 2013 following major flooding in 2009 and 2012. It is currently at the Outline Design and Exhibition stage, and is expected to go to construction in 2018. The Scheme comprises of Flood Defences along the River Lee downstream of Inniscarra dam and through Cork city, changes to the operating procedures for the Carrigadrohid and Inniscarra reservoirs for the purposes of flood risk management (as may be facilitated by the proposed Flood Defences) and a flood forecasting system to help guide decision-making on dam discharges and, if necessary, the erection of temporary / demountable defences downstream and in Cork City. The Scheme is expected to provide protection against the 100-year fluvial flood (1.0% Annual Exceedance Probability) from the River Lee, and against the 200-year tide (0.5% Annual Exceedance Probability) for about 2,100 properties.

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Hydrometric monitoring is proposed in Ballingeary to improve confidence in the design flows, noting that is has been reported that recent floods exceeded the level and extent of the predicted 1% AEP.

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The proposed measure consist of flood walls and embankments to protect vulnerable properties in Ballingeary. These wall range in height from 0.7 – 1.1m while the embankments have a maximum height of 2.3m.

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The Bandon River (Dunmanway) Drainage Scheme was initiated in 1990 following major flooding in 1986, and was constructed from 2000 to 2002. The Scheme, that comprises Flood Defence embankments, berm/channel conveyance improvements, provides protection against a 100-Year flood (1% Annual Exceedance Probability) for 35 properties against flooding from Bandon River.

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The proposed further measure for Foynes that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• A 1.26km long quay/sea wall is required to defend the AFA from the 0.5% AEP event. Floodgates would also be required at a number of locations along the wall to maintain access to the port. It is important to note that the exact positioning of the wall would need to be determined during detailed design stage following consultation with all the relevant stakeholders, as there are a number of pipeline and other utility services within the working corridor of the proposed defence wall.
• An improved outfall structure is required on the Foynes River where it discharges at the quay, to prevent tidal ingress. It was noted at the Public Consultation Day in Foynes during the Draft Flood Mapping stage that “the sluice gate at this location is not currently maintained and there is silt build up, maintaining and removing the silt would help reduce flood risk”. Therefore, this measure should be an improved sluice or flapped outfall arrangement with an accompanying active inspection and maintenance regime.
• A 37m long flood defence wall with a typical height of 0.6m above ground level.
• A 85m long flood embankment with a typical height of 1m above ground level.
• The existing arterial drainage maintenance scheme will need to be maintained as part of this option.

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The Foynes Tidal Flood Alleviation Scheme was initiated in 2014 following major flooding in January and February of that year. It went to construction in 2016 and has been completed. The works comprise largely of constructing flood defence walls, installing non return valves and some short sections of demountable defence and provide protection to 188 properties against the 0.5% AEP (200 year) coastal event.

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The proposed further measure for Newcastle West that may be implemented after project-level assessment, planning or Exhibition and confirmation might include:

• Construction of 851m of new flood walls and 284m of new flood defence embankments;
• Existing regime is to be maintained.

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The Newcastle West works were initiated in 2008 following major flooding in August of that year and were constructed from 2009 to 2010 by the OPW using the provisions of Section 38 of the 1945 Arterial Drainage Act that permit improvements to the existing Deel Catchment Drainage Scheme. The works comprised largely of raising and improving flood defence walls, installing non return valves and providing a flood alarm to the town and provide protection to 50 houses against the 1% AEP (100 year) fluvial event.

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The Al River Athlone works were initiated in 2002 and constructed from 2002 to 2003. The works comprise channel and culvert improvements along the Al River downstream of the culvert in the Technology Park to improve capacity to at least 2m³/sec and the construction of a penstock to attenuate the flow.

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The proposed measure for Athlone includes:

• Construction of 1.038km of new flood defence walls, 2.29km of embankments, and a 16m floodgate;
• Installation of a simple flood-forecasting unit, which includes the addition of telemetry to an existing hydrometric gauge to send warning messages when water level reaches a specified trigger point.
• Introduction of a storage area.
• Targeted public awareness will be introduced for properties affected by the various floodgates throughout the town.

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The proposed measure for Ballinasloe that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction of 530m of new flood defence walls, 5,050m of flood defence embankments and a demountable flood gate;
• Construction of two new 6m wide flood alleviation arch culverts at Ballinasloe East Bridge. The invert level of these culverts is 35.3m;
• Regarding of the riverbank 130m upstream and downstream of the bridge to 35.3m to maximize efficiency of the flood alleviation culverts;
• Construction of two Lock Gates across the Canal and a sluice gate across the channel flowing into the marina from the canal;
• Upgrade existing culvert to a 2.0m dia. Culvert;
• Upgrade the existing Kilclooney Road Bridge on the River Deerpark;
• Regarding of the riverbed upstream and downstream of Kilclooney Road Bridge to maximize efficiency of the upgraded structure;
• Public Awareness, Flood Forecasting will also be required as part of this measure;
• Maintain all existing defences;
• The West and East Atlas channels need to be maintained to ensure their full capacity can be utilised in a flood event.

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The Derrymullan Flood works were initiated in 2010 following major flooding in the 2009 flood event, and constructed from 2010 to 2011. The works comprise the construction of a flood relief wall around Derrymullan, installation of penstock and flood gates and provides protection against a 1% AEP (100 year) fluvial event from the Deerpark River for 135 properties.

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The River Fergus Upper (Ennis) Certified Drainage Scheme was constructed from 2008 to 2010. The scheme comprises flood defence walls and pumping stations and provides protection against a 1% AEP (100 year) fluvial event from the River Fergus for 450 properties. This scheme was undertaken by the OPW and is maintained as part of current duties.

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The River Fergus Lower (Ennis) Certified Drainage Scheme commenced construction in 2013. It is expected that the Scheme will be completed in 2018, (Fior Uisce/Aughanteeroe contract). The scheme comprises flood defence walls, embankments and pumping stations and will provide protection against a 1% AEP (100 year) fluvial event from the River Fergus for approximately 700 properties. This scheme is being undertaken by the OPW and will be maintained as part of current duties.

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The Ennis South Flood Relief Scheme has received An Bord Pleanála approval and is expected to go to construction in 2018. The scheme comprises flood defence embankments and flow diversion culverts and is expected to provide protection against a 1% AEP (100 year) fluvial event. The scheme is being implemented by Clare County Council with funding from the OPW.

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The proposed measure for Limerick City that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Structural flood defences.
• Limerick Port Area – This area provides a flow path in the 0.5% Coastal AEP flood event and as a result a number of properties are at risk of flooding in the area. This risk can only be reduced/removed with the use of structural defences. There is a significant challenge in providing flood defences while also not disrupting the ports activities. This measure includes demountable defences along two sections of the port. There are existing mitre gates that enclose deep water in the freight dock. Mitre gates can only resist deep water on one side of the gate. In the 0.5% coastal AEP design event the high tide in the Shannon estuary will exceed the water level inside the dock and overtop the existing gates. To provide protection from the 0.5% Coastal AEP flood event a pair of opposed gates are required, opening outwards away from each other. A new set of mitre gates that open out into the estuary are included as part of this measure.
• Upgrade the existing culvert on the Ballysheedy watercourse. Larger culvert box to be provided. The culvert is approximately 425m long. Some dredging (deepening and widening) of the stream is required for a distance upstream of the culvert entrance. The exact alignment of the culvert to be reviewed at detailed design stage.
• Upgrade three existing culverts on the Ballincurra (Creek).
• Upstream lock gates on the Plassey Canal - The existing canal lock gates need to be replaced as part of this measure. The new lock gates will be higher than the existing gates and be capable of retaining flood water on the upstream side to a level of 6.5m AoD Malin.
• Downstream lock gates on the Plassey Canal – The existing downstream lock gates have been assumed to be in good condition Limerick City 58 and capable of performing a coastal flood defence function up to a level of 5.1m AoD Malin. Therefore, the existing lock gates must be maintained as part of the measure.
• Mill Race Watercourse - Two sluice gates capable of retaining coastal flood water to a level of 5m AoD Malin are required on the Mill Race watercourse.
• Ballygrennan watercourse – As part of this measure a new flapped outfall is required on this watercourse at the R464 road culvert. Two/three top-hinged rectangular tide gates are required to flap the outfall. An online storage area is required.
• Mount Shannon Road - Structural flood defences are required in this area. Demountable flood gates will also be required to maintain access.
• Raise 500m section of the Old Cratloe Road.
• Public Awareness for properties.
• Flood Risk Management Plan for the Shannon Upper and Lower River Basin
• A Flood Forecasting system for the Lower Shannon will also apply as part of this measure.

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The Howleys Quays works were constructed in circa 2012. The works comprise flood defence walls and demountable barriers was part of a public realm project and provides protection against the then view of the 1% AEP (100 year) fluvial event from the River Shannon. These works were undertaken by Limerick City Council with some funding from the OPW and are maintained under local authority duties.

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The Clancy Strand works were constructed in the mid 2000’s. The works comprise flood defence walls and demountable barriers and provides protection against the then view of the 1% AEP (100 year) fluvial event from the River Shannon for 100 properties. These works were undertaken by Limerick City Council with funding from the OPW and are maintained under local authority duties.

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The Sir Harry’s Mall works were constructed in the mid 2000’s. The works comprise flood defence walls and provides protection against the then view of the 1% AEP (100 year) fluvial event from the Abbey River for 134 properties. These works were undertaken by Limerick City Council with funding from the OPW and are maintained under Local Authority duties.

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The King’s Island Flood Relief Scheme was initiated in 2014 following major flooding in February 2014. It is currently at preliminary design stage, and is expected to go to planning in 2018. An advanced phase at Verdant Place has been completed. The Scheme comprises tidal flood defences embankments and walls, pumping stations and is expected to provide protection against a 0.5% AEP (200 year) coastal event for 473 properties (as estimated by ARUP/JBA) from the River Shannon, Abbey River and tidal events.

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The Gort River (Bridge Street) Drainage Scheme was initiated in 1996 following major flooding in 1990 and 1994/1995, and was constructed in 1997. The Scheme comprises channel deepening and widening upstream and downstream of the N18 Road Bridge on the Gort/Cannahowna River for a length of 260m including associated bank protection walls, underpinning of the N18 Road Bridge and the construction of a flood embankment along the southern side of the N18 east of the bridge. The scheme provides protection against a 100-Year flood (1% Annual Exceedance Probability) from the Gort/Cannahowna River for 21 properties.

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This system would include a "level trigger flood warning" which would require the installation of a new telemetered level gauge at Gort Bridge. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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A tidal flood forecasting and warning system to include high resolution forecasts for Louisburgh is to be developed. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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Progress the project-level development and assessment of a Flood Relief Scheme for the Cois Aibhainn Flood Cell in Westport, including environmental assessment as necessary and further public consultation, for refinement and preparation for planning / Exhibition and, if as appropriate, implementation.

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AFA scale flood relief works may be viable depending upon the findings of structural investigations into the performance of the existing river walls and the ability of the existing foundations to foot new or improved flood defence walls. The December 2015 flooding was in excess of the 1% AEP design standard and so the proposed flood relief works do not protect to this standard, however a number of methods are technically viable and should be considered if extra funding is available to protect to a higher design standard. At the same time as progressing potentially viable flood relief works in the Cois Aibhainn flood cell, a more detailed assessment of the costs to be progressed to determine if an economically viable measure, for the whole of the Westport AFA, may in fact exist that could justify the progression to full project-level assessment.

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A tidal flood forecasting and warning system to include high resolution forecasts for Westport Quay is to be developed. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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The River Deel (Crossmolina) Flood Relief Scheme was initiated in 2012 following on from a Feasibility Report on the "Crossmolina Flooding Problem” carried out by OPW in January 2012. Significant flooding has occurred in Crossmolina in October 1989, December 2006 and November 2015, with the highest on record in December 2015. The Scheme is currently at design stage. It is proposed that a new flood overflow channel upstream of the town to Lough Conn will be implemented as part of the works. The scheme is scheduled to move to Exhibition stage in Q2 2018, and when completed is expected to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 116 properties against flooding from the Deel River.

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The Crossmolina Individual Property Protection (IPP) Pilot Scheme was initiated in 2016, with the relevant properties protected by September 2017. The Scheme, that comprises of flood defence gates for the doorways of individual properties, reduces the risk of internal flooding from the Deel River for 76 properties.

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The costs of disruption and evacuation of a Nursing Home need to be costed in partnership with the nursing home operators and Mayo County Council emergency planners. Such costs will give sufficient level of certainty in the flood damages to screen potentially viable flood risk management methods.

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The slow response of the River Moy means it is possible to develop a fluvial flood forecasting and warning system for Ballina and Foxford using local level gauges. One additional level gauge in Foxford is proposed. Fluvial warnings for Foxford and Ballina should be based on a level to level system using existing gauges and re-instated Foxford gauge.

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A fluvial flood forecasting and warning system, which will be a level trigger based, is to be developed for the Swinford AFA, with the level gauge located near the railway bridge, to provide warning for properties downstream on Railway Terrace. Levels will trigger a warning to be issued to the few properties at risk. Setting a low threshold will allow for sufficient response time.

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The proposed measure would include the construction of an embankment measuring 415m long and 1.2m average height to store / attenuate flood water in larger events and an associated controlled outfall to prevent overland flooding of properties downstream (including the Woodlands Estate and the nursing home) when flow exceeds the existing culvert capacity.

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High resolution forecasts are available at Galway Bay and could be used to provide warning to Sligo town. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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The proposed measure consists of a series of flood embankments and walls. These hard defences would protect to the 1% AEP fluvial event with an average height of 1.85m and a total length of 797m. The hard defences option would also require a number of culverts through flood defences to be constructed including non-return valves.

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The proposed measure consists of a series of flood walls to protect to the standard of a 1% AEP fluvial flood event. These walls consist of a total of 416m of wall height ranging between 0.6m and 3m.

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The proposed measure consists of a series of flood embankments and walls. These Hard Defences would protect to the 1% AEP fluvial event with an average height of 2.1m and a total length of 2.6km. The proposed measure would also require raising two local roads in the northern part of the AFA. The proposed measure relies on flood protection being provided by some existing embankments that were constructed to provide protection to agricultural land, and that were not constructed to the modern engineering standards that would be applied now when providing urban flood protection. A detailed geotechnical structural and stability assessment of the existing embankments was not undertaken as part of the CFRAM study, but should be undertaken as part of the project-level assessment in progressing this measure.

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The proposed measure consists of diverting surface water flow originating from the hills to the north and west of Raphoe by the creation of an open channel to collect and divert flows away from the town. Earth embankments from the excavated channel will be created on the lower side of the channels to provide freeboard and prevent overtopping. Diverted flow will be directed to existing river channels to the south-west and south-east of the town respectively.

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The proposed measure consists of a series of flood embankments and walls with additional measures in place to protect properties in the Milltown area. These FRM methods would protect properties only to the 1% AEP flood event. The Hard Defences would provide design SoP with an average height of 1m and a total length of 3km.

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The proposed measure consists of a series of walls and embankments and by improving the existing embankment. New defences would, where possible, be set back from the existing rock amour along the coastline. These hard defences would protect to the 0.5% AEP coastal event with an average height of 1.13m and a total length of 2.4km.

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The proposed measure consists of a series of flood embankments and walls. These hard defences would protect to the 1% AEP flood event with an average height of 0.8m and a total length of 0.6km.

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The proposed measure consists of a series of hard defences, including flood embankments and walls, rock armour coastal protection, demountable barriers, road raising, a sluice gate and tanking of two properties, and channel conveyance improvements. The defences would be required along with improvement of channel conveyance on the Blackrock River and Dundalk Blackwater River, along with Storage on the Castletown River. This proposed measure would protect to the 0.5% coastal events and the 1% AEP fluvial flood event. Hard defences required have an average height of 1.4m and a total length of between approximately 17 and 20km (there are two options for the route of the defences). A full structural assessment of the existing defence wall in Blackrock should be undertaken.

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At risk properties would be protected by a series of flood embankments, walls and two pumping stations. The fluvial Hard Defences would contain the flow of 1% AEP fluvial event within the upper reaches of the Carlingford and Carlingford Commons watercourses to provide partial protection. When required during a fluvial event and at high tidal water levels the two Pumping Stations would extract any flood water that cannot be discharged to Carlingford Harbour as normal. The fluvial Hard Defences and the Pumping Station would both need to be in place to achieve full protection from a 1% AEP fluvial event.

The coastal Hard Defences would provide design SoP for the 0.5% coastal events with an average height of 1m and a total length of 2.5km. At risk properties would be protected by a series of flood embankments, walls, and an upgrade to a culvert. The upgraded culvert would contain the flow of 1% AEP fluvial event within the Mullatee watercourse. The coastal Hard Defences would provide design SoP for the 0.5% coastal event with an average height of 0.7m and a total length of 1km.

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The proposed measure consists of a series of hard defences, including flood embankments and walls, rock armour coastal protection, demountable barriers, road raising, a sluice gate and tanking of two properties, and channel conveyance improvements. The defences would be required along with improvement of channel conveyance on the Blackrock River and Dundalk Blackwater River, along with Storage on the Castletown River. This proposed measure would protect to the 0.5% coastal events and the 1% AEP fluvial flood event. Hard defences required have an average height of 1.4m and a total length of between approximately 17 and 20km (there are two options for the route of the defences). A full structural assessment of the existing defence wall in Blackrock should be undertaken.

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The proposed measure consists of a series of flood embankments and walls. Hard Defence would also include a 253m long section of raised road where space is restricted for walls or embankments. The raising of the road would require that the soffit level of a critical bridge structure be raised in conjunction with the road raise. These hard defences would protect to the 1% AEP fluvial flood event with an average height of 1.36m and a total length of 0.64 km.

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The proposed measure consists of improvement of channel conveyance in two areas along the Termonfeckin watercourse. This FRM option would protect to the 1% AEP flood event by removing a weir downstream of Drogheda Bridge, dredging approximately 1135m 3 of material and underpinning four bridges along Strand Road.

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The proposed measure for Baltray that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls), largely constructed along a new line set back from the existing line of defences. The proposed hard defences would protect to the 1% AEP fluvial flood event and to the 0.5% AEP coastal flood event, with an average height of 1.33m and a total length of 1.05km. The proposed hard defences avoid impinging on the qualifying habitats for which the SPA / SAC were designated but does not protect a local recreational area.

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The proposed measure for Drogheda that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) along the River Boyne and improvement of conveyance, hard defences and a flow diversion channel on various tributaries. Some sealing of manholes and localised raising of roads would also be required, as would automated defences to allow continued operation of port activities. The hard defences would protect to the 1% AEP fluvial flood event and to the 0.5% AEP coastal flood event, with an average height of 1.95m and a total length of 4.3km. The improvement of channel conveyance consists of 215m of additional 1.5m diameter twin culvert within the vicinity of the old Usher’s Mill at Greenhills and 91m of dredged and widened channel.

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The proposed measure for Navan that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls), road raising and clearance of a 500m reach of the Abbeylands Tributary. The hard defences would protect to the 1% AEP fluvial flood event with a total wall length of 889m, a total embankment length of 340m and a total length of 986m of road to be raised.

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The assessment for Trim found no viable measures with a benefit-cost ratio greater than 0.5, and so no further assessment at an AFA-scale was carried out. The low benefit-cost ratio is due to the relatively low risk to properties during the 1% AEP fluvial flood event in Trim, resulting in a small benefit value. However, Trim could benefit from the implementation of the Boyne Flood Forecasting and Warning System

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The Ashbourne Flood Relief Scheme was initiated in 2015 following major flooding in November 2014. It is currently at construction stage, and is expected to be completed in 2018. The Scheme, which comprises of the construction of an overflow weir to divert flow to the Broadmeadow River and the improvement of channel and culvert capacity along channel C1/7 of the Broadmeadow and Ward Scheme, is expected to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 69 properties against flooding from channel C1/7 of the Broadmeadow and Ward Scheme

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The Duleek Flood Relief scheme was initiated in 1995 and was constructed from 1997 to 1998. The Scheme, comprises flood defence walls and embankments along the Nanny River and Paramadden stream and a storm water pumping station, provides protection against a 100-Year fluvial flood (1% Annual Exceedance Probability) for 88 properties.

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A flood relief scheme for Ratoath was developed under the FEM-FRAMS, elements of which have been constructed. Further works including the replacement of the Broadmeadow bridge and associated works are yet to be completed. However the measure identified has a BCR below unity and a detailed assessment of the costs is recommended to determine if an economically viable measure may exist that could justify the progression to full project level assessment.

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A flood relief scheme for Rush was developed under the FEM-FRAMS and proposed for progression to implementation in the FEM FRMP. However the measure identified has a BCR below unity and a detailed assessment of the costs is recommended to determine if an economically viable measure may exist that could justify the progression to full project level assessment.

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The FEM-FRAMS was initiated in 2008 and included assessment of the Skerries area. A flood risk assessment was completed and a flood relief scheme proposed for the AFA. The Scheme, which comprises, construction of hard defences (embankments & flood walls), culvert removal and the upgrade of three access bridges, is expected to provide protection against an estimated 100-Year fluvial flood (1% Annual Exceedance Probability) and a 200-Year flood (0.5% Annual Exceedance Probability) tidal event for 61 properties.

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The FEM FRAM Study included an assessment of the St. Margaret’s, Belcamp and Balgriffen areas. A flood risk assessment was completed and a flood relief scheme proposed for the AFA. The Scheme, which comprises improving channel capacity by removing an existing unused bridge together with construction of flood defence embankments & walls upstream of the R123 (Balgriffin Cottages/Moyne Rd.) and along the left bank of the Mayne River and tributary is expected to provide protection against an estimated 100-Year fluvial flood (1% Annual Exceedance Probability) for 20 properties.

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The proposed measure for Blessington that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) and, on the Newtown Park watercourse, the sealing of four manholes. The hard defences would protect to the 1% AEP fluvial flood event, with an average and maximum height of 1.2m and 2.4m respectively and a total length of 1.5km. A 125m length of road would also have to be raised.

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The proposed measure might include physical works, such as a series of hard defences (flood embankments and walls) and improvement of channel conveyance. The hard defences would protect to the 1% AEP fluvial flood event with an 80m flood embankment adjacent to the Coolfitch watercourse and a 82m wall adjacent to the River Liffey in the town centre with an average and maximum height of 0.67m and 0.79m respectively. The proposed measure would also consist of improving the channel conveyance along 646m of the Coolfitch watercourse and removal of a weir on the Kilwoghan watercourse.

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The proposed measure for Clane that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) and improvement of conveyance. The hard defences would protect to the 1% AEP fluvial flood event, with a height range of 0.6m – 1m and a total length of 633m. The improvement of channel conveyance consists of the removal of a culvert and the upgrade of three access bridges.

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The Tolka Flood Alleviation Scheme was initiated in 2002 following a major tidal flooding event in February of that year and a major fluvial flooding event in November 2002, these had estimated return periods of 68 and 100 years. Emergency construction started immediately following the November 2002 event with the majority of the works completed between 2003 and 2009. Construction was undertaken within three local authority areas Meath, Fingal and Dublin City. The Co. Meath elements of the works were primarily centred around Dunboyne and Clonee with flood defence walls and embankments along the Tolka River and a diversion of the Clonee Stream under the M3 Motorway. Further embankments were placed along the Castle Stream with channel deepening/widening also carried out. When combined these works provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 332 properties.

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The Tolka Flood Alleviation Scheme was initiated in 2002 following a major tidal flooding event in February of that year and a major fluvial flooding event in November 2002, these had estimated return periods of 68 and 100 years. Emergency construction started immediately following the November 2002 event with the majority of the works completed between 2003 and 2009. Construction was undertaken within three local authority areas Meath, Fingal and Dublin City. The Co. Meath elements of the works were primarily centred around Dunboyne and Clonee with flood defence walls and embankments along the Tolka River and a diversion of the Clonee Stream under the M3 Motorway. Further embankments were placed along the Castle Stream with channel deepening/widening also carried out. When combined these works provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 332 properties.

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The Tolka Flood Alleviation Scheme was initiated in 2002 following a major tidal flooding event in February of that year and a major fluvial flooding event in November 2002, these had estimated return periods of 68 and 100 years. Emergency construction started immediately following the November 2002 event with the majority of the works completed between 2003 and 2009. Construction was undertaken within three local authority areas Meath, Fingal and Dublin City. Within Fingal the scheme was constructed in Mulhuddart and comprises flood defence walls, embankments and a pumping station. When combined these works provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 18 properties

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The proposed measure for Newbridge that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls), four new or upgraded trash screens tanking two existing properties and works to improve channel conveyance including dredging 90m of the Doorfield tributary and upgrading two culverts. The hard defences would protect to the 1% AEP fluvial flood event with an average and maximum height of 1m and 1.7m respectively and a total length of 520m. The two culverts will be upgraded to 1.5m diameter pipes in order to convey the 1% AEP fluvial flow within the channel.

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The proposed measure for Sutton & Howth North that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a combination of wave return walls and flood defence walls with an average and maximum height of 1.1m and 2.4m respectively

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The Aspen Road (Swords) Scheme was initiated in 2011, and was constructed from 2011 to 2012. The Scheme, that comprises involves increasing the channel capacity by widening the Gaybrook Stream along a 200m length at Aspen, provides protection for 9 properties against fluvial flooding.

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The Kilcock Flood Risk Assessment and Management Study was initiated in February 2009 to address deficiencies highlighted by An Bord Pleanála with previous flood risk assessments in the area and was completed in August 2009. The developer led study proposed a flood risk management option, which would protect existing properties and proposed development areas against flooding from the River Rye Water. In light of significant changes to the zoning of land in Kilcock in 2014 by the Meath County Council, the construction of a length of flood defences within the town, and the final water levels, flows and mapping produced by the Eastern CFRAM Study, a review of the 2009 Study is now recommended.

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The Arklow Flood Relief Scheme [Avoca River (Arklow) Drainage Scheme] was initiated in 2002 following major flooding in 1986, 1989 and 2002. It is currently at Design stage and is expected to go to planning in mid-2018. The Scheme, will comprise of general river maintenance and the construction of sheet piled and concrete walls as well as embankments. The possibility of underpinning Arklow Bridge and the possible removal of a ‘pinch point’ in the channel downstream of Arklow Bridge are also being considered. It is expected to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for fluvial flooding and a 200-Year flood (0.5% Annual Exceedance Probability) against tidal flooding.

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The proposed measure for Wicklow, Ashford and Rathnew that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences, storage and improvement of channel conveyance. The hard defences would protect to the 1% AEP fluvial flood event, with an average height of 1.1m (reaching a maximum height of 1.5m) and a total length of 4km. The two storage areas on the Broomhall and Burkeen catchments have a total capacity of approximately 14,800m3. The improvement of channel conveyance consists of the removal of a weir on the Ballynerin watercourse.

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The proposed measure for Aughrim that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls). The hard defences would protect to the 1% AEP fluvial flood event, with an average height of 1.5m and a total length of 0.76km.

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The proposed measure for Avoca AFA that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) along with improvement of channel conveyance on a tributary. The hard defences would protect to the 1% AEP fluvial flood event, with an average height of 1.4m and a total length of 0.5km. Improving the channel conveyance of a tributary at the AFA’s northern boundary would consist of removing three weirs, dredging a length of 18m of the river and underpinning a bridge.

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The proposed measure for Greystones that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls, 1.5km long) and a storage area. The measure would protect to the 1% AEP fluvial flood event, with an average hard defence height of 0.9m (reaching a maximum height of 1.8m).

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The proposed measure for Kilcoole that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls). The hard defences would protect to the 1% AEP fluvial flood event, with an average height of 0.8m (reaching a maximum height of 1.3m) and a total length of 640m.

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The proposed measure for Loughlinstown that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) along with dredging, a bridge and culvert upgrade on the Shanganagh River and two storage areas on the Deansgrange River. The proposed measure would protect to the 1% AEP flood event with a total wall length of 0.9km, a total embankment length of 0.6km, a total volume of in-channel excavation of 350m3, a total volume of storage area excavation of 3,874m3, one bridge upgrade and five culvert upgrades. The hard defences have an average height of 1.6m (reaching a maximum height of 3.4m).

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The proposed measure for Newcastle that may be implemented after project-level assessment and planning or Exhibition and confirmation might include natural flood risk management measures and physical works, such as a series of hard defences (flood embankments and walls) to provide a standard of protection for the 1% AEP fluvial flood event. It was assumed during the assessment that the natural flood risk management measures would reduce the peak flow of a 1% AEP flood event to the equivalent of a present day 2% AEP flood event. It is recommended that the viability of this method is analysed further through detailed design. In addition to natural flood risk management measures, at risk properties would be protected by a reduced series of flood walls and embankments on the Newcastle watercourse. The hard defences will have an average height of 1.1m (reaching a maximum height of 2m) and a total length of 830m.

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The proposed measure for Wicklow, Ashford and Rathnew that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences, storage and improvement of channel conveyance. The hard defences would protect to the 1% AEP fluvial flood event, with an average height of 1.1m (reaching a maximum height of 1.5m) and a total length of 4km. The two storage areas on the Broomhall and Burkeen catchments have a total capacity of approximately 14,800m3. The improvement of channel conveyance consists of the removal of a weir on the Ballynerin watercourse.

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The proposed measure for Old Connaught and Wilford that may be implemented after project-level assessment and planning or Exhibition and confirmation might include physical works, such as a series of hard defences (flood embankments and walls) in conjunction with, a culvert upgrade and channel dredging at the Dublin Road adjacent to St Brendan’s School, and a flow diversion channel on the Old Connaught River. The hard defences would protect to the 1% AEP fluvial flood event, with an average height of 1.0m (reaching a maximum height of 1.7m) and a total length of 1.1km.

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The proposed measure consists of building hard defences, at risk properties would be protected by a series of flood embankments and walls. These hard defences would protect to the 1% AEP flood event with an estimated average height of 1.3m and a total length of 0.58km.

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The development of a flood relief scheme is currently underway for Enniscorthy (Slaney). The Fairfield & Cherry Orchard area of Enniscorthy is affected by fluvial flooding, however, no properties are at flood risk during a 1% AEP event. Therefore, no additional measures specific to Enniscorthy are proposed.

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A flood relief scheme has been implemented for Tullow AFA, and is maintained by the Local Authority. No additional measures specific to Tullow AFA are proposed.

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The proposed measure consists of building hard defences and improvement of channel conveyance. At risk properties would be protected by a series of flood embankments and walls, along with improvement of channel conveyance close to the downstream end of the Carricklawn River. The hard defences required to protect to the 1% AEP fluvial flood event and a 0.5% AEP coastal flood event, have an estimated average height of 1.4m and a total length of 1.3km. Conveyance could be improved by dredging the existing channel, which conveys the entire flow from the downstream end of the Carricklawn River over 271m before reaching the downstream of the Coolcots River and the sea.

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The proposed measure consists of building hard defences, at risk properties in Athy would be protected by a series of hard defences consisting of flood embankments and walls. These hard defences would be set back from the river channel where possible and would protect to the 1% AEP fluvial flood event with an estimated average height of 1.2m and length of 2.9km.

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The proposed measure would protect at risk properties by a series of hard defences consisting of flood embankments and walls. These hard defences would be set back from the river channel where possible and would protect to the 1% AEP fluvial flood event with an estimated average height of 1m and a total length of 2.4km.

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The proposed measure would protect at risk properties by a series of hard defences consisting of flood embankments and walls. These hard defences would be set back from the river channel where possible and would protect to the 1% AEP fluvial flood event with an estimated average height of 1.6m and a total length of 3.3km.

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An interim flood defence scheme was constructed in New Ross from 2007 to 2009 to provide protection to 65 properties. This interim scheme has been complemented by a more comprehensive scheme, which has been substantially completed, to provide a higher standard of protection and protect more properties in the town. The Scheme, which comprises 2.1km of tidal flood defences walls and engineered embankments, glass flood panels, demountable barriers, drainage and storm water pumping.

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The proposed measure would protect at risk properties by a combination of an embankment and flow diversion from the Ballyhale watercourse to the Little Arrigle River. The embankment would protect to the 1% AEP flood event with an estimated average height of 0.9m and a total length of 53m. The flow diversion would be located immediately downstream of the bridge where a weir structure would be required to regulate the flow between the proposed flow diversion and the existing channel. This would reduce flow along the Ballyhale watercourse therefore significantly reducing the extent of hard defences required.

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The proposed measure consists of a combination of flow diversion and improved channel conveyance methods, at risk properties would be protected by the construction of two flow diversion channels. Proposed diversion channel 1 being 3.12km long, 3m wide and 1.5m deep and proposed diversion channel 2 being 2.6km long, 3.5m wide for the first 878m and 3m wide for the remainder and 1.5m deep throughout. This option would also require seven 2.1m x 1m box culverts and a weir control at the confluence with the Upperwood watercourse. Two weirs would be removed on the Nuenna River (02WEIR02 at Chainage 1227 and 03WEIR01 and Chainage 1240). Improvement of Channel conveyance on the Upperwood River would involve the lowering of 216m of channel by 0.4m.

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The proposed measure consists of building hard defences, at risk properties would be protected by a series of flood embankments and walls set back where possible from the river channel allowing the floodplain function to remain active. These hard defences would protect properties from the 1% AEP fluvial event and the 0.5% AEP coastal event with an estimated average height of 1.7m and a total length of 870m.

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A flood relief scheme has been implemented for Kilkenny (Nore) AFA, and is maintained by the OPW. No additional measures specific to the Kilkenny (Nore) AFA are proposed.

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The proposed measure would consist of a combination of hard defences and storage methods. The at-risk properties would be protected from a 1% AEP fluvial flood event by a series of flood walls and embankments (average height of 1.2m and a total length of 1.3km), along with storage along the Glasha River and the Kilcoran watercourses (approx. storage volume of 135,014m3).

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by a combination of flood defences, road raising and two electrically operated penstocks. The proposed flood defences would include sheet piles to counter the underground flow paths which exist between the river and flood receptors and consist of a series of flood embankments (average height of 1.25m and a total length of 667m) and retaining walls (average height of 1.5m and a total length of 300m).

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by a combination of flood defences and improved channel conveyance. The potential flood defences would consist of a series of flood embankments (average height of 1.0 m and a total length of 78m), flood walls (average height of 1.2m and a total length of 90m) and road raising (0.4m over bridge) on the Cromoge River. The potential improvement in channel conveyance would consist of a bridge replacement with a culvert (1.6m x 6m wide) on the Cromoge River and pipe replacement with culvert (2m x 8m x 15m long) on the Coolataggle tributary. The potential improvement in channel conveyance would also consist of 2m of channel widening and 110m of channel conveyance on the Cromoge River and channel conveyance of 95m and 88m of new channel to be cut on the tributary river.

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by a combination of flood defences, improved channel conveyance and other works. The potential flood defences would consist of a series of flood embankments (average height of 1.2 m and a total length of 265m) and flood walls (average height of 1.2m and a total length of 503m) on the Suir River and its tributary. The potential improvement of channel conveyance would consist of upgrading one existing weir in the diversion channel and upgrading one existing culvert on the tributary river, and Installation of a Penstock Sluice Gate in the diversion channel of the River Suir – 2 m height x 8 m width.

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The Carrick on Suir Flood Defence Scheme was constructed in 2001. The Scheme comprises of flood defence walls, embankments, localised floating barriers and pumping stations for storm water that would otherwise accumulate behind the defences. It provides protection against a 50-Year flood (2% Annual Exceedance Probability) for 110 properties against flooding from the River Suir.

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The Clonmel Flood Defence Scheme was constructed between 2008 to 2012. The Scheme comprises of flood defence walls, demountable elements, and embankments, channel conveyance improvements and pumping stations for storm water that would otherwise accumulate behind the defences. It provides protection against a 100 -Year flood (1% Annual Exceedance Probability) for 500 properties against flooding from the River Suir.

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by flood defences. The potential flood defences would consist of the following:

• Flood embankments (average height of 1.2m and a total length of 621m),
• Flood walls (average height of 1.3m and a total length of 184m),
• Upgrading existing walls (average height 1.3m and a total length of 116m),
• Installation of flood gates (3 No. 2m x 3m and 4 No. 2m).

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by flood defences. The proposed flood defences would include sheet piles to counter the underground flow paths which exist between the river and flood receptors and consist of a series of flood embankments (average height of 1m and a total length of 425m), flood walls (average height of 1.2m and a total length of 50m) and a demountable barrier (1.5m length x 1.2m high).

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It was not possible to determine accurately what underground flow structures exist at the outflow from the lake, and so a robust hydraulic model could not be developed for the area.

Funding via OPW’s Minor Works Programme was approved for a site investigation including culvert systems and design of repair and reconstruction works.

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by a combination of flood defences and Improved Channel Conveyance. The potential flood defences would consist of a series of flood embankments (average height of 1.5 m and a total length of 220m), flood walls (average height of 1.2m 20m parapets for bridge, 50m at main channel downstream of Bridge on Main Stream and 50m at side channel north of Newcastle) and road raising (over the existing culvert and at the bridge on main street over a length of 30m and raised by 0.4m (average)). The potential improvement in channel conveyance would consist of a bridge replacement of the existing bridge on Main Street and channel maintenance between the Ardfinnan Road and the Suir.

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by a combination of flood defences and Improved Channel Conveyance (Bridge Replacement).

• The potential flood defences would consist of a series of flood embankments (average height of 1.2 m and a total length of 125m), flood walls (average height of 1.2m and total length of 72m) and road raising (On minor channel 130m length, raise by 0.6m (maximum) and 20m road re-establishment over Creamery Bridge),
• The potential improvement in channel conveyance would consist of a bridge and culvert replacement of 14m by 1.8m, 10m length arch bridge 4m by 2m, 15m length box culvert,
• The potential improvement in channel conveyance would also consist of in channel excavation - 800m3 of excavated materials and underpin minor channel footbridge - 6m to depth 0.3m.

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The Templemore Flood Relief Scheme was initiated in 2008 and is currently at construction stage. The Scheme, that comprises a new river diversion channel, associated road and field crossing culverts along with fluvial flood defence walls and embankments is expected to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for approximately 110 properties against flooding from River Mall.

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by flood defences. The potential flood defences would consist of a series of flood embankments (average height of 1.5 m and a total length of 493m), flood walls (average height of 1.2m and total length of 589m) and flood gate (1m at bridge opening at crossing of Emmet Street and Thomond Road).

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The Waterford City Flood Alleviation Scheme was initiated in 1994 and was constructed from 2008 to 2015. The Scheme comprises of flood defence walls, embankments, flood gates and pumping stations for storm water that would otherwise accumulate behind the defences. It provides protection against a 200-Year flood (0.5% Annual Exceedance Probability) for 615 properties against flooding from Waterford Harbour, the River Suir Estuary and the Johns River.

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The proposed measure would consist of building hard defences within the Dungarvan Harbour and Colligan Estuary areas and the improvement of conveyance upstream of Ringphuca. At risk properties in the Dungarvan Harbour and Colligan Estuary areas would be protected by a series of flood walls and a flood gate at the Strand Side South slipway. The walls proposed within the Dungarvan Harbour area (i.e. in open coastal areas) would have to be designed to accommodate wave overtopping during the detailed design phase. These hard defences would protect at risk properties from the 1% AEP fluvial event and the 0.5% AEP coastal event with an average height of 1.2m and a total length of 1.3km. Although this Hard Defence option would be located within the Dungarvan SPA, it would protect a number of NIAH buildings along Strand Side South and the at risk properties within the Dungarvan urban area. At risk properties in the Ringphuca area would be protected by upgrading a culvert adjacent to the River Lane estate and widening the channel upstream. These improved conveyance methods would provide protection from the 1% AEP fluvial event and involve removing approximately 338m3 of sediment from within the channel and upgrading the culvert to a 2.1m x 1m box culvert.

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The proposed measure would consist of building hard defences within the Dungarvan Harbour and Colligan Estuary areas and the improvement of conveyance upstream of Ringphuca. At risk properties in the Dungarvan Harbour and Colligan Estuary areas would be protected by a series of flood walls and a flood gate at the Strand Side South slipway. The walls proposed within the Dungarvan Harbour area (i.e. in open coastal areas) would have to be designed to accommodate wave overtopping during the detailed design phase. These hard defences would protect at risk properties from the 1% AEP fluvial event and the 0.5% AEP coastal event with an average height of 1.2m and a total length of 1.3km. Although this Hard Defence option would be located within the Dungarvan SPA, it would protect a number of NIAH buildings along Strand Side South and the at risk properties within the Dungarvan urban area. At risk properties in the Ringphuca area would be protected by upgrading a culvert adjacent to the River Lane estate and widening the channel upstream. These improved conveyance methods would provide protection from the 1% AEP fluvial event and involve removing approximately 338m3 of sediment from within the channel and upgrading the culvert to a 2.1m x 1m box culvert.

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The proposed measure consist of Flood Defence walls and embankments. These walls and embankments will be up to 1.1m in height.

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The proposed measure consist of fluvial Flood Defences comprising of walls and embankments up to a maximum height of 2.5m. Road raising will also be carried out in certain locations.

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The Fermoy Flood Relief Scheme was initiated in 2002 and it was decided to implement the scheme on a phased basis. The northern phase was constructed between 2009 and 2010. The Fermoy (North) Flood Relief Scheme, that comprises flood defence walls and embankments, demountable flood defence walls, and pumping stations, provides protection against a 100-year flood (1% Annual Exceedance Probability) for about 77 properties from the (Munster) Blackwater River. Construction of the South and West phases was commenced in 2012. The Fermoy (South and West) Flood Relief Scheme, that comprises flood defence walls and embankments, demountable flood defence walls, penstocks, and pumping stations, will provide protection against a 100-year flood (1% Annual Exceedance Probability) for about 264 properties from the (Munster) Blackwater River.

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The Freemount Flood Relief Scheme was initiated in 1998 following major flooding in 1997, and was constructed in 2001 by Cork County Council. The Scheme that comprises of two bypass culverts provides protection against a 100-year flood (1% Annual Exceedance Probability) for 16 properties against flooding from fluvial flooding.

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The proposed measure consist of the provision of a storage area on the Dalua River upstream of the town along with fluvial Flood Defences on the Dalua and Allow rivers comprising of walls and embankments along with storm water pump stations.

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The Mallow Flood Relief Scheme was initiated in 2002 and it was constructed in phases between 2005 and 2013. The scheme, that comprises flood defence walls and embankments, demountable flood defence walls, flood relief culverts with trash and security screens, penstocks, conveyance improvement, and pumping stations, provides protection against a 100-year flood (1% Annual Exceedance Probability) for about 230 properties from the (Munster) Blackwater River.

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The proposed measure consist of the diversion of flood flows from the Kilbrien Stream via a 1200mm diameter culvert to the Shanowen River and will protect against the 1% AEP fluvial flood event.

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The proposed measure consist of flood walls and embankments to protect vulnerable properties in Inchigeelagh. These defences range from 0.6 – 1.9m in height.

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A study is currently underway to review the hydrology and hydraulic analysis completed under the Lee Pilot CFRAM Study to determine whether a flood protection scheme may be potentially viable for Macroom. This study is expected to be completed in 2018.

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The proposed measure consist of the diversion of the Kiltha River around the town via an existing bypass channel through the grounds of the hotel and the construction of flood walls to protect vulnerable properties at the confluence of the Kiltha and the bypass channel.

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The Midleton Flood Relief Scheme was initiated in 2016 following major flooding in December 2015. It is currently at Outline Design stage, with consultants having been appointed by Cork County Council in 2016. It is expected to go to construction in 2019/2020 and to be completed in the following two years. The proposed Scheme, which comprises permanent tidal and fluvial Flood Defence walls and/or embankments in the town. It is expected to provide protection against a 200-Year tidal flood (0.5% Annual Exceedance Probability) and a 100-Year fluvial flood (1% Annual Exceedance Probability) for 246 properties against flooding from the Dungourney and Owenacurra Rivers.

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Flood defences were previously built to protect properties in the community of Tower / Blarney.

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The development of a tidal flood forecasting system was proposed for Whitegate under the Lee CFRAM Study.

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The development of a tidal flood forecasting system was proposed for Passage West under the Lee CFRAM Study.

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A flood relief scheme for Little Island was developed under the Lee CFRAM Study, and proposed for progression to implementation in the Lee CFRAM Study. The proposed measure consists of the installation of a sluice gate under the N25 to prevent the natural propagation of tidal water into low lying lands to the north of the N25 and is expected to provide protection against a 200-Year flood (0.5% Annual Exceedance Probability).

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The Douglas (Togher) Flood Relief Scheme was initiated in 2014 following major flooding in 2012. It is currently at the Outline Design and Planning stage, and is expected to go to construction in 2018. The Scheme, that comprises conveyance improvement, culvert removal and replacement, Flood Defence walls and a trash screen, is expected to provide protection against the 100-Year flood (1% Annual Exceedance Probability) for about 130 properties from the Ballybrack Stream in Douglas, as well as about 100 properties from the Tramore River in Togher.

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The Carrigaline Flood Relief Scheme has been under review to confirm the technical aspects and viability, and, subject to outcomes, will then progress to Outline Design and Planning.

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The Glashaboy Flood Relief Scheme was initiated in 2014 following major flooding in 2012. It is currently at Confirmation stage under the Arterial Drainage Acts, and is expected to go to construction in 2018. The Scheme, that comprises Flood Defence embankments and walls, culverts and bridge works, vegetation clearing, individual property protection, and a pumping station is expected to provide protection against the 100-Year flood (1% Annual Exceedance Probability) for about 98 properties from the Glashaboy River, as well as protection for a further 19 properties against the 200-Year (0.5% Annual Exceedance Probability) tide.

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The Douglas Flood Relief Scheme was initiated in 2014 following major flooding in 2012. It is currently at the Outline Design and Planning stage, and is expected to go to construction in 2018. The Scheme, that comprises conveyance improvement, culvert removal and replacement, Flood Defence walls and a trash screen, is expected to provide protection against the 100-Year flood (1% Annual Exceedance Probability) for about 130 properties from the Ballybrack Stream in Douglas, as well as about 100 properties from the Tramore River in Togher.

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The Ballymakeery / Ballyvourney (Baile Mhic Ire / Baile Bhúirne) Flood Relief Scheme is currently at pre-Exhibition Stage, and is expected to go Exhibition in 2018. The Scheme comprises of a combination of embankments, walls, channel straightening, bridge underpinning and localised dredging and is expected to provide protection against a 100-Year flood (1% Annual Exceedance Probability) for 80 properties against fluvial flooding.

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The Bandon Flood Relief Scheme was initiated in 2010 following major flooding in 2009. It is currently under construction and it is expected to be completed in 2019. The Scheme that comprises conveyance improvement works, Flood Defence embankments and walls, and pumping stations is expected to provide protection against the 100-year flood (1% Annual Exceedance Probability) for about 392 properties from the Bandon River.

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The Clonakilty Flood Relief Scheme was initiated in 2014. It is currently at detailed design stage, and is expected to go to construction in 2018. The Scheme, that comprises mainly of tidal Flood Defences walls and upstream storage in a retention basin upstream of the town, in addition to pump stations, localised defences and repair works to the existing channel banks, to provide protection against a 100-Year flood (1.0% Annual Exceedance Probability) for fluvial and a 200-Year flood (0.5% Annual Exceedance Probability) for tidal for 296 properties against flooding from either fluvial flooding, tidal flooding or both.

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The proposed measure consist of walls and embankments with a maximum height of 2.0m along the River Bandon.

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The Skibbereen Flood Relief Scheme was initiated in 2011 following major flooding in 2009. It is currently under construction and it is expected to be completed in 2019. The scheme that comprises Flood Defence embankments and walls, pumping stations, together with a small element of conveyance improvement, is expected to provide protection against the 200-year flood (0.5% Annual Exceedance Probability) for about 312 properties from the tidally influenced River Ilen.

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The proposed measure consists of the construction of a new culvert along the Schull Stream, located along the road and diversion of the Meenvane Stream to an alternative watercourse via a flow diversion culvert.

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The proposed measure consist of Fluvial Flood Defences comprising of walls and embankments and Tidal Flood Defences comprising of sea walls.

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The proposed measure consist of sea walls with removable barriers for access to slipways etc. The walls range from 1.1 – 2.1m in height.

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The proposed measure consist of Fluvial Flood Defences comprising of walls and embankments on the Finnihy and Kealnagower rivers and Tidal Flood Defences comprising of walls, embankments and removable barriers. The measure also includes the removal of the existing pipe under Finnihy Bridge.

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The proposed measure consist of the construction of an open channel to divert the Anglore Stream around Tullig and Fluvial Flood Defences comprising of walls and embankments. This measure does not provide protection downstream of the Church Street Bridge.

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The proposed measure consist of the provision of a storage area on the Dingle Stream upstream of the town and Tidal Flood Defences comprising of sea walls and embankments.

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The proposed measure consist of Fluvial Flood Defences comprising of walls and embankments.

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The proposed measure have been investigated for Milltown. The assessment of these works are detailed in the Preliminary Options Report. None of the methods were found to be economically viable. This is because the flood risk in the Milltown AFA is relatively low. There are only 6 no. residential properties and 9 no non-residential properties at risk in Milltown from the 1% AEP event. The assessment found that the cost of protecting those properties was over four times the value of the potential flood damage to those same properties.

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The proposed measure consist of the construction of an open channel to divert the Anglore Stream around Tullig and Fluvial Flood Defences comprising of walls and embankments. This measure does not provide protection downstream of the Church Street Bridge.

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The proposed measure for Abbeydorney that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Localised widening of the River Boherroe from a 4m to a 5.5m wide channel along the 150m reach between the Bridge road bridge and R556 road bridge. It is intended that the works will provide protection to properties at risk of flooding in the 1% AEP and a reduction in flood depths to properties in area.
• An earth embankment with an average height of 1m across the floodplain to prevent the flow route from the Milltown House Stream to provide complete protection to properties for the 1% AEP event.
• Introduction of maintenance programme for the defences and other watercourses within the AFA.

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The proposed measure for Banna that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of an embankment, 325m long with an average height 1-1.5m above ground level.
• Discontinuing the existing regime of removing silt and debris from the outfall at Blackrock.

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The proposed measure for Listowel that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Increase the height of 0.9km of existing embankments and raise approximately 30m of road in order to eliminate flood risk to the properties within the 1% AEP event.
• Flood forecasting to allow the community/local authority to ensure that the amenity walkway along the river is cleared and appropriate pedestrian diversions are in place.
• Existing maintenance regime for the Feale along with a maintenance programme for the improved and existing defences.

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The proposed measure for Tralee that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Increase capacity of the diversion channel between Mackies River and the River Big.
• Provide a wall on the right bank of the open channel of the flood diversion between the Mackies River and the River Big.
• Improve inlet arrangement at the diversion channel diverting flow from the River Big to the River Ratass.
• Construct diversion channel from the River Ratass to the River Tralee.
• Construct diversion channel from the River Tralee to the River Ballynabrennagh replacing the River Tralee culvert.
• Improve the capacity of the River Ballynabrennagh and provide embankments on the left bank.
• Construct walls along the River Big downstream of Brewery Road.
• Embankment and flapped outfall to protect properties at Knockmoyle and Caheranne Village.
• Clean and maintain the Ratass watercourse as it flows through the industrial estate of Manor West.
• Embankment and raise the road to protect the Pier 17 business centre.
• Upgrade of walls adjacent to Windmill lane including the provision of floodgates at the carpark entrance.
• Construct wall to protect properties adjacent to the canal at Blennerville.
• Construct wall along Kearney’s Road.
• Clean and maintain the Caherweesheen, Cloghers, Ballydunlea and Ballyvelly watercourses. Only cleaning is required where channel maintenance has been identified as part of the measure, changes in channel geometry in the form of deepening or widening of the channel area is required.
• Construct embankments along the right bank of the River Lee and Lower Ballynabrennagh to protect properties in Manor Village, Castlemorris Mews.
• Construct embankments along the left bank of the River Lee to protect properties in the Ballymullan area including, Hunters Wood, Cois Abhann, LIDL, Topaz, Aspen Grove, Castlemaine, Glencastle.
• Construct walls along the lower Caherweesheen watercourse. Construct embankments and raise the N70 road further upstream on the Caherweesheen and Cloghers Stream.
• Construct two embankments to provide protection from the Ballyvelly and Ballydunlea watercourses (area to the south of Tralee Rugby Club).

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The proposed measure for Athea that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of 160m of flood defence walls.
• Construction of 150m of flood defence embankments.

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The proposed measure for Adare that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of 455m of new flood defence walls and 2,435m of new flood defence embankments.
• A demountable flood gate will be required across the old railway line and should be tied into the new flood defence wall and embankment. Flood forecasting will also be required as part of this measure.
• Adare Bridge is a Protected Monument of National Importance. The parapet wall on the upstream face will need able to provide a flood defence function up to the required design standard. It has been assumed that the entire parapet wall will need to be rebuilt, with the average height being 1.5m above existing road level. It has also been assumed that the bridge is structurally sound and capable of withstanding the loading forces of a 1% AEP fluvial flood event. The new embankments on the left bank will need to tie into the parapet wall.
• Existing arterial drainage maintenance scheme will need to be maintained as part of this option.

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The proposed measure for Askeaton that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of 968m of new flood defence walls and 405m of new flood defence embankments;
• Increased conveyance from the tributary to the River Deel. This tributary is located upstream of the town centre and flows into the River Deel from the West. This involves widening and deepening approximately 30m of the tributary channel and replacing 130m culvert linking the tributary to the main channel. The replacement culvert would flow underneath the road and the Aeroboard factory premises, and requires a new headwall at the upstream extent to prevent overtopping. The existing arterial drainage scheme needs to be maintained as part of this option.

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The proposed measure for Ballylongford that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of 800m of new flood defence walls and 1,200m embankments as will eliminate the flood risk within the AFA for the 0.5% AEP coastal event and the 1% fluvial AEP event.
• Existing arterial drainage maintenance scheme will need to be maintained as part of this option.

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The proposed measure for Rathkeale that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• A new flood defence embankment, 400m in length. The embankment will typically be between 1.0m - 1.5m above the existing ground level.
• Existing arterial drainage maintenance scheme will need to be maintained as part of this option.

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The Dromcolliher Scheme was initiated in 1998 following major flooding in 1997 and was completed c.2001 by Limerick County Council. The Scheme, which comprises largely of a control structure and a bypass culvert built almost entirely under the streets of the village, provides protection to 10 properties against the 1% AEP (100 year) fluvial event.

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The proposed measure for Birr that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construct 591m of new flood defence walls.
• Installation of a simple flood forecasting unit, which includes the addition of telemetry to an existing hydrometric gauge to send warning messages when water level reaches a specified trigger point.
• Targeted public awareness.

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The Mulkear River (Cappamore) Certified Drainage Scheme was constructed from 1998 to 2002. The Scheme comprises flood defence walls and embankments, channel conveyance improvements, a flood bypass channel, and watercourse diversions and provides protection against a 1% AEP (100 year) fluvial event from the Mulkear River and tributaries for 70 properties.

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The proposed measure for Clonaslee that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Maintain existing arterial drainage channels along the Gorragh River;
• Remove the existing weir and localised levelling of the River bed on the Clodiagh River upstream of the R422 Bridge;
• Increase channel capacity by dredging a section of the Clodiagh River.

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The proposed measure for Killaloe & Ballina that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Deepen and widen the Drumbane channel;
• Deepen and widen the Grange channel;
• Replace Bridge on the Grange watercourse.

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The Mullingar Scheme was initiated in 2002 and was constructed from 2005 to 2010. The Scheme comprises flood defence walls and embankments along the Brosna River and provides protection against a 1% AEP (100 year) fluvial event from the Brosna River for 20 properties.

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The proposed measure for Nenagh that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construct a new 480m embankment along Nenagh River to defend properties.
• Replace culvert on Benedin Stream with hydraulic control to limit flows downstream during flood events.
• Flood forecasting unit on River Nenagh.
• Targeted public awareness.
• Introduction of a storage area.

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The Mulkear River (Ballymackeogh) Certified Drainage Scheme in Newport was initiated in 1997 and was constructed from 1997 to 1999. The works were primarily to restore the old Drainage District scheme and comprised making good the embankments and some improvements, such as the deepening and widening of the restrictive stretch alongside the Bunky tributary. The scheme provides protection for 53 properties in Newport against flooding from the Mulkear River.

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The proposed measure for Portumna that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction of a 434m new flood defence wall and an 870m embankment.
• Installation of a simple flood-forecasting unit, including an addition of telemetry to an existing hydrometric gauge to send warning messages when water level reaches a specified trigger point.
• Public awareness
• Raised road level over a length of 20m along the north of Portumna Harbour.
• Vertical Sector Gate to act as a barrier to flooding across the entrance to Portumna Harbour to prevent the inlet receiving flood water directly from the Shannon. The structure would consist of a set of gates which could be closed after a flood warning, and open during normal conditions to allow the passage of boats.
• Maintain existing flood defences.

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The proposed measure for Rahan that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Maintain existing arterial drainage scheme;
• Construct a new 90m flood defence embankment, on the right bank of the Clodiagh River upstream of Rahan Bridge.

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The proposed measure for Roscrea that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construct 630m of new structural flood defence walls and 213m of flood defence embankments.

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The Tullamore Scheme was initiated in 2008 and was constructed from 2012 to 2013. The Scheme comprises flood defence walls and embankments along the Tullamore River and the Barony Stream and provides protection against a 1% AEP (100 year) fluvial event for 100 properties.

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The proposed measure for Castleconnell that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction of a new flood defence wall, embankment and floodgates.
• Raising roads in key locations.
• Maintain existing flood forecasting and public awareness campaign operated by the ESB

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The proposed measure for Springfield that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction of a new flood defence embankment, floodgate and pump.
• Maintain existing flood forecasting and public awareness campaign operated by the ESB.

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The proposed measure for Boyle that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of 340m of new flood defence wall.
• Maintain existing flood defences and arterial drainage scheme in the Boyle AFA.
• Promotion of Individual and Community Resilience.

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The proposed measure for Carrick on Shannon that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction 1,799m of new flood defence walls, 846m of new embankments and a 2m floodgate.
• Rising the road level.
• Installation of a simple flood forecasting unit, including an addition of telemetry to an existing hydrometric gauge to send warning messages when water level reaches a specified trigger point.

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The proposed measure for Longford that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construct a 30m new flood defence wall.
• Remove the existing footbridge on the Camlin River upstream of the N63 Bridge.

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The proposed measure for Mohill that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of 69m of new flood defence walls;
• Public awareness.

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The proposed measure for Roscommon that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construct 2,065m of flood defence walls and 350m of flood defence embankment;
• Upgrade existing culvert along N63 Galway Road at Ballinagard tributary;
• Public awareness.

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The flood risk management measures considered are based on the predicted flood risk maps which were determined using all available survey and historical data up to Summer 2012. Anecdotal evidence from flood events in November/December 2015 and hydrometric gauge 26120 suggest that the Shannon CFRAM predicted flood maps may, however, under-predict the flood extent for less frequent (i.e. greater magnitude) flood events, and that there are areas of Ahascragh at risk of flooding that are not represented in the CFRAM predicted flood maps.

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The proposed measure for Dromod that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction of 368m of new flood defence walls, 263m of new embankments, and a 13m flood gate to defend properties.
• Flood forecasting.
• Promotion of Individual and Community Resilience.

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The proposed measure for Leitrim village that may be implemented after project-level assessment and planning or Exhibition and confirmation might include;

• Construction of 142m of new flood defence wall and a 498m new embankment, and a flood gate.
• Construction a flapped outfall unit for the watercourse that passes through the embankment to prevent reverse flow from the River Shannon.
• Installation of a simple flood forecasting unit, including a new hydrometric gauge with water level monitoring and telemetry to send warning messages when water level reaches a specified trigger point.
• Maintain existing arterial drainage scheme.

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The proposed measure for Athleague that may be implemented after project-level assessment and planning or Exhibition and confirmation might include:

• Construction of a 190m new flood defence wall, 340m embankment and a floodgate to defend properties.
• The introduction of the above flood defences and their location will interfere with existing drainage. Current flood surface water drainage flows directly in the Silver Stream. During flood events the Silver stream acts as a flow path for flood waters from the River Suck. A series of sewers, non-return valves and a pumping station will be required to ensure that pluvial flooding is also reduced. This would have additional benefits which are not captured within the CFRAM process. The costs of the required upgrade sewer have not been included in the costing for this measure.

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The proposed measure for Bunratty that may be implemented after project-level assessment and planning or Exhibition and confirmation, might include:

• Construction of new flood defence walls 190m long on the right bank side of the Owenagarney River, upstream and downstream of Bunratty Bridge, (Quay walls – on upstream bank).
• Public Awareness will apply to one commercial property.
• Existing flood defences will need to be maintained as part of this option.

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The proposed measure for Kilkee that may be implemented after project-level assessment and planning or Exhibition and confirmation, might include:

• Construction of new flood defence walls of total length 850m along the right bank of the Kilkee Lower (River) watercourse and along the left and right bank of the Kilkee Upper (River) watercourse.
• Any existing embankment along the left bank of the Kilkee Upper (Stream) watercourse will need to be assessed and raised in some places by 0.3m. Downstream of the existing embankment, the existing wall will need to be assessed and will need to provide a flood defence function up to a level of 5.8m OD.
• Construction of new flood defence wall parallel to the Kilkee East watercourse.
• Upgrading existing culvert downstream of the Kilkee East watercourse.

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The proposed measure for Kilrush that may be implemented after project-level assessment and planning or Exhibition and confirmation, might include;

• Construction of new flood defence embankments of 177m and 60m respectively, and a new flood defence wall of 33m along the right bank.

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The proposed measure for Shannon town that may be implemented after project-level assessment and planning or Exhibition and confirmation, might include:

• Construction of 1,555m of new flood defence walls and 1,215m of new flood embankment.
• Diversion of flow, from the Watercourse that flows between Smithstown Industrial Estate and Beech Park Logistic Centre to a natural storage area south east of the watercourse located on the Ballycasey Creek.
• Natural online storage areas, balancing pond and natural flood plain areas.
• Replace existing 90m culvert and 35m culvert.
• Maintain existing coastal defences.

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The Sixmilebridge Scheme was constructed in 1996/1997. The scheme comprises flood defence embankments and provides protection against a 1% AEP (100 year) fluvial event from the Owenagarney River for 16 properties. This scheme was undertaken by the OPW and is maintained as part of current duties.

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High resolution forecasts are available at Galway Bay and, as part of a coastal flood forecasting system for Galway Bay, could be used to provide warning to the residents of Kinvarra. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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High resolution forecasts are available at Galway Bay and, as part of a coastal flood forecasting system for Galway Bay, could be used to provide warning to the residents of Oranmore. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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The Scheme will provide protection for approximately 80 properties against for 1% Annual Exceedance Probability flood event from the Clare River and Turlough areas at Carnmore / Cashla and Lakeview and which comprises of the following:

• Flood eye at Claregalway Bridge (complete) with associated channel deepening upstream under and downstream of the bridge and flood eye (partially complete)
• Construction of a new bridge at Crusheeny (complete)
• Channel widening from downstream of Crusheeny Bridge for 1.3 km upstream
• Embankment construction upstream of the confluence with the Islandmore drain for 0.7 km with a non-return valve on the Islandmore drain (in progress)
• Embankment at the Nine Arches Bridge (complete)
• Increasing capacity of two culverts on the Kiniska drain (complete)
• Providing drainage for floodwater via pipeline from Lakeview to the Clare River (substantially complete)
• Providing drainage for floodwater from Carnmore / Cashla area via pipeline to Islandmore drain
• Associated maintenance of the stretch of the Clare River and tributaries within the Scheme
• Road raising at Miontagh South (in progress) and Miontagh North

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The proposed measure would include the placement of quay defence walls in order to protect against the 0.5% AEP design event with an average wall height of 1.2m, as required for public safety. This includes a freeboard allowance of 0.3m. The quay walls would extend from the dock, continuing along Long Walk and Spanish Arch. The properties in the Claddagh area, along Grattan road and Father Griffin would be provided protection by building a quay wall along the Claddagh basin and Nimmo's pier. Flood defences along the property line and localised land and road raising in Salthill will manage wave overtopping risks.

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High resolution forecasts are available at Galway Bay and, as part of a coastal flood forecasting system for Galway Bay, could be used to provide warning to the residents of Roundstone. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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The proposed measure would involve the construction of an earthen embankment at Clifden Glen approximately 0.3 -1.2m in height and a flood wall at the Low Road 1.2m in height. No protection is required at Riverside as depths are not above threshold level of the properties.

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A tidal flood forecasting and warning system to include high resolution forecasts for Newport is to be developed. This system would provide the ability to inform managing authorities and the public of the potential for failure or overtopping of flood defence structures and to trigger emergency response plans.

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The proposed measure would include constructing new quay walls with piled foundations, 1.2m high at Bachelors Walk (470m long) and 0.6m high with 0.6m high railings above, in front of properties on Clare Street (340m long). The flood wall at Clare Street will continue north for 170m to tie into higher ground. In front of the Cathedral on the N59, 210m of river bank will be raised to fit into the existing landscape. Along Ridgepool Road railings will be replaced with flood defence walls, in some points the existing walls will be raised with a total of 200m length of works here. In many of the gaps, walls will only need to be raised to 0.6m above ground level with 0.6m high railings (to provide a 1.2m guarding height). This will fit into the height of the existing river walls and maintain some visual connection. Freeboard for all walls and raised river banks is in excess of 0.3m above the peak flood level.

Two pumping stations (either new or upgraded existing) will be required to manage surface water and fluvial flooding behind the river walls, one on each bank of the River Moy.

On the Knockanelo (or Sruffaunbrogue) the inlets to the flood relief culvert and downstream culverts will be improved with some further works to the existing box culverts at Marian Crescent.

This option includes ongoing maintenance of the river walls, pumping stations and enhanced maintenance above the current Arterial Drainage maintenance programme for the full length of culverts on the Knockanelo through the town centre and the Flood Relief Culvert.

Upstream catchment and land management should be reviewed as a means of optimising the benefits of capital and resource expenditure.

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The proposed measure for Cavan that may be implemented after project-levelassessment and planning or Exhibition and confirmation might include physical works. The proposed measure consists of a series of flood embankments and walls. These harddefences would protect to the 1% AEP flood event with an average height of 1.4m and a total length of 2km.

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The proposed measure for Ballybay that may be implemented after project level assessment and planning or Exhibition and confirmation might include physical works. The proposed measure consists of a series of flood embankments and walls. These hard defences would protect to the 1% AEP flood event with an average height of 1.6m and a total length of 2.5km.

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The proposed measure for Donegal AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of storage and a series of flood embankments and walls. These hard defences would protect to the 1% AEP flood event with an average height of 0.9m and a total length of 2.4km.

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The proposed measure for Killybegs AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood walls and road raising. These hard defences will provide an SoP of 1% AEP for fluvial flood events and 0.5% for coastal flood events, at a total length of 1.3km and an average height of 1m.

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The proposed measure for Kerrykeel AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of removing a restrictive bridge structure.

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The proposed measure for Downings AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood embankments and flood walls. The hard defences will provide an SoP of 0.5% AEP for coastal flood events and an SoP of 1% AEP for fluvial flood events. The hard defences have an average height of 1m and a total length of 0.3km.

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The proposed measure for Dunfanaghy AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood walls, raising of the deck level of Dunfanaghy pier and ‘tanking’ of three properties. These measures will provide a 0.5% AEP SoP for coastal flood events. The flood walls are required to be an average height of 1.0m and a total length of 200m. The Dunfanaghy pier would require approximately 850m2 of raising by an average of 900mm. Additionally, a structural survey of the existing wall would be required to ensure it is fit for purpose as a flood defence.

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The proposed measure for Glenties AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood embankments and walls and land use management. These measures will provide a 1% AEP SoP. One location would consist of 67m of flood walls between 1m and 1.8m high and tanking of two existing building walls. The second location would consist of 139m of flood embankment 0.8m high (average). Land use management would be applied to the catchments in order to mitigate any adverse effects from constructing the hard defences on a protected species. The freshwater pearl mussels’ habitat is located downstream in the Owenea River. Land use management would be assessed to identify land use features that would reduce surface water runoff. Consequently, there would be flood risk reduction juxtaposed with a reduced sediment and pollutant load entering the protected watercourses.

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The proposed measure consists of a series of walls and embankments. These hard defences would protect to the 1% AEP fluvial flood event and 0.5% AEP coastal event with 197m of wall height between 0.6m and 1.2m, and 160m of wall height between 1.2 and 2m.

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The proposed measure consists of a series of sea walls, flood embankments and flood walls. The hard defences will provide an SoP of 0.5% AEP for coastal flood events, and an SoP of 1% AEP for fluvial flood events with an average height of 1m and a total length of 1.6km.

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The proposed measure consists of flood embankments and urban walls. The hard defences would protect to the 1% AEP flood event with an average height of 2.1m and a total length of 0.6km. The proposed measure relies on flood protection being provided by some existing embankments that were constructed to provide protection to agricultural land, and that were not constructed to the modern engineering standards that would be applied now when providing urban flood protection. A detailed geotechnical structural and stability assessment of the existing embankments was not undertaken as part of the CFRAM study, but should be undertaken as part of the project-level assessment in progressing this measure.

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The proposed measure for Letterkenny AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood walls and embankments, along with the replacement of a footbridge on the Cullion watercourse. The hard defences will provide an SoP of 0.5% AEP for coastal flood events and an SoP of 1% AEP for fluvial flood events. The hard defences have an average height of 1.4m and a total length of 3.8km. The replacement of the footbridge will have a minimum soffit level of 6.5mOD Malin. The proposed measure would also involve extending and raising existing flood defences where they are found to have insufficient height/length to prevent flooding. It is assumed that existing flood defences can be extended, the required extension height and associated base width was determined.

The proposed measure relies on flood protection being provided by some existing embankments that were constructed to provide protection to agricultural land, and that were not constructed to the modern engineering standards that would be applied now when providing urban flood protection. A detailed geotechnical structural and stability assessment of the existing embankments was not undertaken as part of the CFRAM study, but should be undertaken as part of the project-level assessment in progressing this measure.

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The proposed measure for Ramelton AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood embankments with revetment protection, walls, demountable barriers along the quays and a flood gate located on Shore Road. These hard defences would protect to the 0.5% AEP coastal event and 1% AEP fluvial flood event with an average height of 1.4m and a total length of 797m. At risk properties would also be protected by installing a trash screen upstream of a bridge which is susceptible to blockage.

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The proposed measure for Rathmullan AFA that may be implemented after project-level assessment and planning or exhibition and confirmation might include physical works. The proposed measure consists of a series of flood embankments, walls and improvement of channel conveyance. This combination would protect to the 1% AEP fluvial flood event and 0.5% AEP coastal flood events. An average height of 2m and a total length of 281m will be required. The Improvement of Channel Conveyance consists of 71m of upgraded culvert.

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The proposed measure consists of using storage areas providing a combined volume of 66,310m 3 on the Ballywilly Brook along with a series of embankments and walls along the Donagh River. Improvement of channel conveyance would protect properties impacted by flooding from the Carndonagh watercourse and hard defences would protect properties impacted by flooding from the Glennagannon River. These combined measures provide protection to a 1% AEP fluvial event.

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The proposed measure consists of embankments and walls which would protect properties to both the 0.5% AEP coastal events and 1% fluvial events.

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by flood defences. The proposed flood defences would include a series of flood embankments (average height of 1.2m and a total length of 191m), upgrading flood walls (average height of 1.2m and a total length of 38m and average height of 1.5m and a total length of 96m) and a flood gate (1 No. over 2m width).

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The potential measure would protect at-risk properties against the 1% AEP Fluvial flood event by flood defences. The proposed flood defences would include a series of flood embankments (average height of 1.4m and a total length of 469m) and a flood gate (1 No. over 6m and 1 No. over 1m).

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