Flood Estimation Handbook Web Service

Catchment map marker For any catchment above 0.5km²:

Point map marker For any point on the map:

The FEH Web Service is provided by the UK Centre for Ecology & Hydrology, a not-for-profit research charity, for use by the flood hydrology community. Income generated by the FEH Web Service users funds the operation, maintenance and development of the web service platform itself and is also re-invested into the web service's underpinning scientific research to ensure the continual advancement in the FEH evidence base. These advancements are guided by regular consultation with the UK regulatory agencies, and liaison with the wider scientific and user community, along with availability of data. Recent updates include new catchment descriptors (e.g. BFIHOST19) and the latest FEH depth-duration-frequency model (FEH22).

The FEH Web Service operates on a pay-as-you-go basis with discounts for pre-paid bundles. Learn more about pricing →


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 FEH22 and FEH13 models as well as the legacy FEH99 model, all 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 FEH22 and FEH13 models. 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.


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.