Products / Flood Mapping
JBA Flood Map of Great Britain
The JBA Flood Map (CFM) of Great Britain (GB) offers a thorough view of flood risk by correlating river, surface water and coastal flood across the whole of the UK. These are presented as Flood Extents divided by flood depth bands (VE).
- Defended/Undefended coastal (split via the return periods of 75, 100, 200, 1000)
- Undefended river (split via the return periods of 20, 75, 100, 200, 1000)
- Surface water (split via the return periods of 75, 200, 1000)
Further layers include;
- Defended river areas (DRAs)
- Defended surface water areas (DSWA)
- Dam break
- Canal failure
- Areas managed by internal drainage boards (IDB).
Prices start at £20 for up to 0.05km2.
JBA Groundwater Flood Map of Great Britain
The Groundwater flood map identifies areas at risk of flooding from groundwater on a 5m resolution grid throughout Great Britain (GB). The groundwater mapping indicates areas where flooding may occur as a result of water rising through chalk aquifers for the following return periods and annual exceedance probabilities:
- 75-year (1.3%)
- 100-year (1%)
- 200-year (0.5%)
Susceptibility to Groundwater Flooding
The groundwater vulnerability maps have been created by the EA and NRW using data from the BGS, the CEH and the NSRI, providing an assessment of the vulnerability of groundwater to a pollutant discharged at ground level.
The groundwater vulnerability for each aquifer type is expressed as:
- High: areas able to easily transmit pollution to groundwater.
- Medium: areas that offer some groundwater protection.
- Low: areas that provide the greatest protection to groundwater from pollution.
- Unproductive: areas comprised of rocks that have negligible significance for water supply or baseflow to rivers, lakes and wetlands. They consist of bedrock or superficial deposits with a low permeability.
Geological Indicators of Flooding
Geological maps show where all the floodplains and coastal plains in Britain are located and therefore the main areas at greatest risk of flooding; from this information BGS has produced the Geological indicators of flooding dataset. 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 house building or flood protection schemes.
The two types of flooding, fluvial and coastal, are each separated into two zones as below:
- Fluvial: Zone 1 (Lower susceptibility) Zone 2 (Higher susceptibility)
- Coastal: Zone 1 (Lower susceptibility) Zone 2 (Higher susceptibility)
NOTE - The BGS Geological indicators of flooding data should be regarded as complementary to, and not a replacement for, existing flood risk maps.
England and Wales - Flood Map
A collection of flood datasets provided by the Environmental Agency, and Natural Resource Wales. This layer has correctly geospatial areas, divided into different three groups.
This layer contains:
- Flood Alert
- Flood Risk Areas
- Flood Warning