The flood peak estimates have been produced using a fully automated version of the Flood Estimation Handbook statistical procedures. The Q(T) grids have been used in conjunction with high resolution Digital Terrain Models to produce the next generation of flood risk maps.

The estimates are not intended to be used by themselves at individual locations. They are intended to be used where network-wide flood assessments are required. They may also be used to complement a manually-derived FEH estimate at a single site, for checking purposes.


Data points screenshot from QT grids data product

Technical features

  • Scale: 50m gridded dataset
  • Supply Format: Arc/Info Grid ASCII
  • Coverage: UK
  • Return periods available: 2, 5, 10, 25, 50, 75, 100, 200, 250, 500 and 1000 years
  • Catchment Descriptors provided: URBEXT, SAAR, PROPWET, DPSBAR, DPLBAR and FARL2.642


Robson A and Reed D, 1999. Flood Estimation Handbook Volume 3: Statistical Procedures for Flood Frequency Estimation. Institute of Hydrology.

Morris D G, 2003. Automation and appraisal of the FEH statistical procedures for flood frequency estimation. Report to Defra, Centre for Ecology & Hydrology.

Obtaining a licence

To obtain a licence, please contact the UKCEH Data Licensing Team by email or telephone, or by clicking the button below to fill in our data request form:

Telephone: +44 (0)1491 692716

Web form

Please fill in our form to request map data