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snippet: Flood risk management is vital as it helps to reduce the damaging results of flooding events. The aim of these maps is to help users make scientifically informed decisions regarding flood risk management in Ireland. The maps do not, and are not intended to, constitute advice. Professional or specialist advice should be sought before taking, or stopping, any action on the basis of this map.
summary: Flood risk management is vital as it helps to reduce the damaging results of flooding events. The aim of these maps is to help users make scientifically informed decisions regarding flood risk management in Ireland. The maps do not, and are not intended to, constitute advice. Professional or specialist advice should be sought before taking, or stopping, any action on the basis of this map.
extent: [[-12.6012166311204,51.2083184499066],[-4.42182667598494,55.6427318003802]]
accessInformation: Contains Irish Public Sector Data (Geological Survey Ireland) licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0) International Licence.
thumbnail: thumbnail/thumbnail.png
maxScale: 1.7976931348623157E308
typeKeywords: ["Data","Service","Map Service","ArcGIS Server"]
description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>Historic Groundwater Flood Map</SPAN></SPAN><SPAN><SPAN> shows the observed peak flood extents caused by groundwater in Ireland. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>This map is to the scale 1:20,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 200m.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>Winter 2015/2016 Surface Water Flooding map </SPAN></SPAN><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>This map is to the scale 1:20,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 200m.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>The </SPAN><SPAN STYLE="font-weight:bold;">Synthetic Aperture Radar (SAR) Seasonal Flood Maps </SPAN><SPAN>shows observed peak flood extents which took place between Autumn 2015 and Summer 2021. </SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The maps were made using Synthetic Aperture Radar (SAR) images from the Copernicus Programme Sentinel-1 satellites. SAR systems emit radar pulses and record the return signal at the satellite. Flat surfaces such as water return a low signal. Based on this low signal, SAR imagery can be classified into non-flooded and flooded (i.e. flat) pixels.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Flood extents were created using Python 2.7 algorithms developed by Geological Survey Ireland. They were refined using a series of post processing filters. Please read the lineage for more information.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The flood maps shows flood extents which have been observed to occur. A lack of flooding in any part of the map only implies that a flood was not observed. It does not imply that a flood cannot occur in that location at present or in the future.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>This flood extent are to the scale 1:20,000. This means they should be viewed at that scale. When printed at that scale 1cm on the maps relates to a distance of 200m.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>They are vector datasets. Vector data portray the world using points, lines, and polygons (areas). The flood extents are shown as polygons. Each polygon has information on the confidence of the flood extent (high, medium or low), a flood id and a unique id.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>Groundwater Flooding High Probability map</SPAN></SPAN><SPAN><SPAN> shows the expected flood extent of groundwater flooding in limestone regions for annual exceedance probabilities (AEP</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>s) of 10%, which correspond with a return period of every 10 years. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>The map was created using groundwater levels measured in the field, satellite images and hydrological models.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>This map is to the scale 1:20,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 200m.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>Groundwater Flooding Medium Probability map</SPAN></SPAN><SPAN><SPAN> shows the expected flood extent of groundwater flooding in limestone regions for annual exceedance probabilities (AEP</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>s) of 1%, which correspond with a return period of every 100 years. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>The map was created using groundwater levels measured in the field, satellite images and hydrological models.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>This map is to the scale 1:20,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 200m.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>Groundwater Flooding Low Probability map</SPAN></SPAN><SPAN><SPAN> shows the expected flood extent of groundwater flooding in limestone regions for annual exceedance probabilities (AEP</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>s) of 0.1%, which correspond with a return period of every 1000 years.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>The map was created using groundwater levels measured in the field, satellite images and hydrological models.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>This map is to the scale 1:20,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 200m.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>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.</SPAN></P></DIV></DIV></DIV>
licenseInfo: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The data must be used only in conjunction with these guidance notes which outlines the critical map limitations.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><A href="http://gsi.geodata.gov.ie/downloads/Groundwater/Reports/GSI_Guidance_Notes_GW_Flood_Maps.pdf" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Guidance Notes</SPAN></SPAN></A></P><P STYLE="margin:0 0 0 0;"><A href="http://gsi.geodata.gov.ie/downloads/Groundwater/Reports/GSI_Guidance_Notes_GW_Flood_Maps.pdf" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>http://gsi.geodata.gov.ie/downloads/Groundwater/Reports/GSI_Guidance_Notes_GW_Flood_Maps.pdf</SPAN></SPAN></A></P><P /><P STYLE="margin:0 0 14 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Licence details</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Groundwater flooding data produced by Geological Survey Ireland (GSI) is free for use under the conditions of Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><A href="https://creativecommons.org/licenses/by-nc-nd/4.0/" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>https://creativecommons.org/licenses/by-nc-nd/4.0/</SPAN></SPAN></A></P><P STYLE="margin:0 0 0 0;"><A href="https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode</SPAN></SPAN></A></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Under the CC BY-NC-ND 4.0 Licence:</SPAN></SPAN></P><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Users must acknowledge the source of the Information in their product or application.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Users may not use the material for commercial purposes.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Users may not redistribute the material if has been modified.</SPAN></SPAN></P></LI></UL><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Please use this specific attribution statement: "</SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>Contains Irish Public Sector Data (Geological Survey Ireland) licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0) International Licence</SPAN></SPAN><SPAN><SPAN>".</SPAN></SPAN></P><P /><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>In cases where it is not practical to use the statement users may include a URI or hyperlink to a resource that contains the required attribution statement.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>More permissions granted above and beyond (but still including) the CC licence can be found </SPAN></SPAN><A href="https://www.gsi.ie/documents/Licence_CCPlus_Groundwater_Flooding_data.pdf" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>here</SPAN></SPAN></A><SPAN><SPAN>.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><A href="https://www.gsi.ie/documents/Licence_CCPlus_Groundwater_Flooding_data.pdf" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>https://www.gsi.ie/documents/Licence_CCPlus_Groundwater_Flooding_data.pdf</SPAN></SPAN></A></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Please read the disclaimer and conditions of use below carefully to avoid incorrect interpretation of the information and data enclosed. The data must be used only in conjunction with these notes, and must not be used in isolation.</SPAN></SPAN></P><P /><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Disclaimer</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>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 maps were prepared in order to address the deficit of groundwater flood data and to assist stakeholders to make scientifically informed decisions regarding groundwater flood risk in Ireland. The maps do not, and are not intended to, constitute advice. Professional or specialist advice should be sought before taking, or refraining from, any action on the basis of the Flood Maps or the website content.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Geological Survey Ireland makes no representations, warranties or undertakings about the data or any aspect of the data including, without limitation, their accuracy, their completeness or their quality or fitness for any particular purpose.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>To the fullest extent permitted by applicable law, neither the State, Geological Survey Ireland nor any of its members, officers, associates, consultants, employees, affiliates, servants, agents or other representatives shall be liable for loss or damage arising out of, or in connection with, the use of, or the inability to use, the information provided including, but not limited to, indirect or consequential loss or damages, loss of data, income, profit, or opportunity, loss of, or damage to, property and claims of third parties, even if Geological Survey Ireland has been advised of the possibility of such loss or damages, or such loss or damages were reasonably foreseeable. </SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Geological Survey Ireland reserves the right to change the content and / or presentation of any of the information provided at its sole discretion, including these notes and disclaimer.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>This disclaimer and conditions of use shall be governed by, and construed in accordance with, the laws of the Republic of Ireland. If any provision of these disclaimer, guidance notes and conditions of use shall be unlawful, void or for any reason unenforceable, that provision shall be deemed severable and shall not affect the validity and enforceability of the remaining provisions.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN>This viewer was developed by the Department of the Environment, Climate and Communications. No reproduction of images in the viewer is allowed without permission of the Department. Base Map information is provided by the Ordnance Survey of Ireland under licence: Ordnance Survey Ireland Licence No. EN 0047222, (Digital Contract) Ordnance Survey Ireland/Government of Ireland. No reproduction of Ordnance Survey Ireland Data is permitted. </SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Terms of Use</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Access to the groundwater flood maps data assumes implied acceptance of the following conditions:</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Whilst every effort has been made to ensure the accuracy of the information/material contained on the web site, Geological Survey Ireland, its servants or agents, or the relevant data owners, assume no responsibility for and give no guarantees, undertakings or warranties concerning the accuracy, completeness or up to date nature of the information provided on the web site/media and do not accept any liability whatsoever arising from any errors or omissions. </SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The User agrees that Geological Survey Ireland has the absolute right to reprocess, revise, add to, or remove any data available on this website as it deems necessary, and that the User will in no way hold Geological Survey liable for any damage or costs incurred as a result of such acts.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The User understands that neither Geological Survey Ireland does not guarantee the accuracy of any data available on this website, and it is the User’s responsibility to independently verify and quality control any of the data used and ensure that it is fit for purpose/use.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Whilst the re-use of the information is encouraged, the user accept that you must not use the Flood Maps for any commercial, business, professional or other income generating activity.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The user understands that the Flood Maps do not, and are not intended to, constitute advice. Professional or specialist advice should be sought before taking, or refraining from, any action on the basis of the Flood Maps or the Website content.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The user accepts all and any liability and responsibility for the interpretation and use of any content on the Website that is downloaded, read or interpreted or used in any way by you or which arises out of any content being passed to a third party by you. </SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The user agrees that they will not pass on any of the Flood Maps or any other content on the Website to any third party without ensuring that said party is fully aware of and accepts the Terms and Conditions.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Subject to the Terms and Conditions, you are free to copy, publish, distribute and transmit the content of the Flood Maps provided that the following conditions are complied with:</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You must not modify or adapt the content.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You acknowledge the source of the content.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You must ensure that you do not use the content in a way that suggests any official status or that Geological Survey Ireland endorse you or your use of the content.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You must ensure that you do not mislead others or misrepresent any information, content or its source.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You agree not to use the content for the principal purpose of advertising or promoting a particular product or service or for an illegal, immoral, fraudulent or dishonest purpose.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You must ensure that your use of the content does not breach Data Protection legislation as may be amended from time to time.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>You must ensure that you do not reverse engineer, decompile etc. any code, data or content on the Website so as to recreate a full dataset or other content.</SPAN></SPAN></P></DIV></DIV></DIV>
catalogPath:
title: IE GSI Groundwater Flood Probability and Historic Flood Maps 20k Ireland (ROI) ITM
type: Map Service
url:
tags: ["Geology","Ireland","IE/GSI","Flood","Groundwater","Predictive","Historic","Geological Survey Ireland","Department of the Environment","Climate and Communications","Synthetic Aperture Radar","SAR"]
culture: en-IE
name: IE_GSI_Groundwater_Historic_and_Probability_Flood_Maps_20K_IE26_ITM
guid: 0307F7AD-3E8B-4285-A192-6329D32740E7
minScale: 0
spatialReference: IRENET95_Irish_Transverse_Mercator