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Flood Data
What is flood data?
Understanding the hazards and types of risks flood presents and their likely social, environmental and economic impacts is essential in site analysis. As well as historical data from past floods, Promap provides information on flood risks from rivers, seas and groundwater in order to help you clearly assess the likelihood of a site to flood or in order for you to carry out your own flood risk assessment.
Key features
Pinpoint sites in the context of flood risk
Map background enables use in professional reports to give them greater impact and quality
Export into CAD / GIS for further flood analysis
Identify residential and commercial areas that have had flood issues in the past
Applications
Confirm which EA Flood Zone a site is in
Confirm if site is in any other Flood Zone or the likelihood of flooding
Flood risk assessments
Regional and national planning purposes (planning applications)
Masterplanning
Context in professional reports and presentations
Aid decision making in desk studies
Valuation Reports
Pre-bid submissions
Where to find flood data in Promap?
All flood data can be purchased by locating to your site and selecting the Export Data options.
The range of flood data available for that area will be displayed, select the one you require and the format type and proceed through the purchase options.
Environment Agency Flood Data
Datasets available:
EA Flood Data (Zone 2 & 3)
The Environment Agency's Areas Benefitting from Flood Defences describes those areas benefiting from the flood defences shown in a 1% fluvial or 0.5% tidal flood event.
Flood Water Storage Areas - This dataset is the Environment Agency's holding of 'Flood Storage Areas' which may be referred to as a balancing reservoir, storage basin or balancing pond. Its purpose is to attenuate an incoming flood peak to a flow level that can be accepted by the downstream channel.
Extreme Flooding from Rivers or Sea without Defences - Extent of extreme flood - the extent of a flood with a 0.1% (1 in 1000) or greater chance of happening each year
Flooding from Rivers or Sea without Defences - The data shows the natural flood plain area that could be affected in the event of flooding from rivers and the sea.
Flood Defences - Probably the most visible signs of Flood Risk Management are flood defences. We build ‘hard defences’ of concrete, metal or other construction but we also try to use natural processes wherever possible to reduce flood risk.
DXF sample
SHP sample
EA Source Protection Zones
It is essential to look after Groundwater sources as it not only provides sources for drinking water, but maintains the flow in rivers. This map has identified Source Protection Zones for 2000 groundwater sources such as wells, boreholes and springs used for public water supply. These zones detail the risk of contamination from any activities that may cause pollution in the area. The closer the activity, the greater the risk.
DXF sample
SHP sample
EA NaFRA
The National Flood Risk Assessment (NaFRA) provides an indication of flood risk at a national level. The data has been created by calculating the actual likelihood of flooding to areas of land within the flood plain of an extreme flood (1 in 1000 chance in any year).
The method considers the probability that the flood defences will overtop or breach. The data enables a comparison of the relative risks and their distribution within each catchment rather than a detailed, local assessment of the risk at a specific location.
DXF sample
TAB sample
EA Detailed River Network
The Environment Agency have developed a river network map derived from Ordnance Survey Mastermap features. The map layer details the name and type of the river as well as recording the direction of flow, source points, sink points, tributary junctions etc.
This map is useful in desk studies, particularly in modelling the impact of pollution, tracing pollution back to its source and when used in GIS applications an accurate network analysis can be carried out.
DXF sample
TAB sample
EA Historic Flood Extents
This historic dataset from Environment Agency details all the flood events recorded from 1947 amounting to over 21,000 records. This data is useful in flood risk assessments to identify past flood events and identify areas of residential and commercial development that have had flooding issues in the past.
DXF sample
EA River Quality Data
Includes both River Quality Biology and Chemistry sampling points this dataset is points based only and suitable for GIS packages. Both sets of points relate to the General Quality Assessment scheme (GQA) that determines the water quality of watercourses as supplied by the Environment Agency.
Measurements are taken at regular intervals at predefined sampling points that are representative of a single reach of a river or a series of reaches in a single catchment. Please note This data is currently only available for England and Wales.
DXF sample
Format Options: DWG, DXF, GML, SHP, TAB
BGS Flood Data
BGS Geological Indicators of Flooding
The maps from the British Geological Survey detail those areas most vulnerable to two types of flooding, inland (river floodplains) and coastal / estuarine.
Inland floodplains are the areas near rivers where mud, sand and gravel have been deposited from previous floods. For coastal plains a range of marine deposits, for example tidal flats, define areas where the sea has formerly occupied the land.
The map is based on observation of the types of geological deposit present and does not take into account any man-made influences such as buildings or flood protection schemes.
The map aids in desktop analysis, flood risk assessments and gives a clear indication as to whether a property or proposed development is at risk from inland or costal / estuarine flooding.
DXF sample
SHP sample
BGS Groundwater Flooding Susceptibility
The dataset produced by BGS is the first national hazard or susceptibility data set of groundwater flooding. Groundwater flooding is increasingly recognised as a hazard but the maps, which are based on geological and hydrogeological information, clearly identify areas where geological conditions could enable groundwater flooding.
Groundwater flooding can be as a result of high groundwater levels and intense storms and can result in significant social and economic disruption due to it lasting longer than river flooding.
The susceptibility data is suitable for use in regional or national planning purposes where the groundwater flooding information will be used along with a range of other relevant information to inform land-use planning decisions.
DXF sample
SHP sample
RMS Flood Data
Flood Hazard 75 Year Return Period
Flood Hazard 100 Year Return Period
Flood Hazard 1000 Year Return Period
RMS pluvial flood data is a modelled dataset, which uses land height, predicted rainfall and a huge variety of other factors to predict both flooding from rivers and, for the first time in Great Britain, surface water flooding, a key factor for flood predications in urban areas.
The RMS data model does not take into account Coastal/Storm Surge Flooding, Dam Failure Flooding, Sewer Overflow Flooding or risk of flooding from the sea.
DXF sample
SHP sample
Where to find flood data in Promap?
All flood data can be purchased by locating to your site and selecting the Export Data options.
The range of flood data available for that area will be displayed, select the one you require and the format type and proceed through the purchase options.
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