Flood Estimation Handbook Web Service
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Flood Estimation Handbook Web Service

The FEH Web Service delivers catchment descriptors and rainfall data to support the methods outlined in the Flood Estimation Handbook (FEH), and implemented in the FEH software, for estimating floods and site runoff rates across the UK.

Get started in England, Scotland & Wales or Northern Ireland

Catchment map marker For any catchment above 0.5km²:

Point map marker For any point on the map:

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What is the FEH Web Service?

The FEH Web Service provides the data and rainfall model outputs that are required to apply the UK flood frequency and rainfall estimation procedures. These procedures are defined by the Flood Estimation Handbook (FEH) and subsequent updates, and implemented in the FEH Software.

It provides catchment level descriptors and rainfall depth-duration-frequency (DDF) estimates to enable flood risk to be estimated for over four million catchments across the UK. It also provides the descriptors and rainfall DDF estimates for any location to support the derivation of runoff rates and volumes to support drainage design using the FEH rainfall runoff methods (ReFH 2).

Catchment map marker For purchased catchments, you can view and export:

  • catchment descriptors (XML, CSV and CD3).
  • depth-duration-frequency (DDF) using the latest FEH13 methods as well as the legacy FEH99 method calculations, both on a catchment average basis and at the nearest 1 kilometre grid location. The DDF information is plotted on interactive rainfall graphs, which can be exported as a csv or an image.
  • catchment boundaries as ESRI shapefiles or PNG images.
  • Learn more

Point map marker For any purchased point on the map (with 1m resolution), you can view and export:

  • XML point soil and climate descriptors.
  • depth-duration-frequency (DDF) using the current FEH13 model. The DDF information is plotted on interactive rainfall graphs, which can be exported as a CSV or an image.
  • Note the legacy FEH99 rainfall depth/rarity values and DDF parameters (C, D1..3, E & F) are not available for points.
  • Learn more

Explore the hydrologically relevant mapping interface to identify the catchment boundaries (over 0.5 km2), and review the variation in annual rainfall (SAAR41-70), hydrogeology and level of urbanisation.

To help in the application of the FEH methods, the interface displays NRFA gauging stations, including Peak Flows classification and links to the station NRFA page.

The FEH Web Service replaces the FEH CD-ROM.

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What is the FEH?

The Flood Estimation Handbook (FEH), with its subsequent updates and FEH Software, provides the industry-standard methods for assessing flood risk in the UK. It offers guidance on the estimation of rainfall and river flood frequency and development site runoff rates across the UK. These are required for:

  • Flood risk assessment
  • SuDS and traditional drainage system design
  • Flood defence planning
  • Design of structures such as bridges, culverts and reservoir spillways
  • To form the basis of flood risk maps
  • Rarity assessment of notable rainfalls or floods

The procedures are clearly explained, and supporting theory and results included.