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WINFAP Downloads

System Requirements
Licence Information
WINFAP5 Release History

Downloads are available for WINFAP below. Most users should download WINFAP 5. To allow continued use for existing studies, the legacy WINFAP 4 can be installed alongside WINFAP 5.

Please also download the latest Peak Flow Dataset.

WINFAP 5.3 uses version 14 of the new NRFA Peak Flow Dataset.  Please see our FAQ for more details. WINFAP 5 does not support old Peak Flow Datasets (version 9 and earlier) nor WINFAP 4 project files (.feh4).

WINFAP 5

  • Standalone licence

    Download WINFAP5 5.3.9380 - Standalone licence
    Version: 5.3.9380 | Release date: 09 Sept 2025 | Checksum: fe89903e6eceeb2191bf08093834d030

    • Release notes:

    • WINFAP 5.3 introduces the 2025 statistical model, which updates the estimation of both the index flood (QMED) and the growth curve. Urbanisation methods have also been updated.
    • These methods rely on new descriptors from the FEH Web Service and NRFA Peak Flows datasets. For more information, see https://www.ceh.ac.uk/services/feh-2025-statistical-updates
    • In addition, this release implements the non-flood years method through the addition of a Generalised Logistic non-flood years distribution.
    • The software provides backwards compatibility with older projects using the 2008 statistical model, and while WINFAP 5.3 is designed to be used with Peak Flows Dataset versions 14 and above, earlier versions with a reduced descriptor set can be used. In these cases WINFAP automatically selects the 2008 method.

  • Network licence

    Download WINFAP5 5.3.9380 - Network licence
    Version: 5.3.9380 | Release date: 09 Sept 2025 | Checksum: 57b0c587bdcb33d11aff389316f9b630

    • Release notes:

    • WINFAP 5.3 introduces the 2025 statistical model, which updates the estimation of both the index flood (QMED) and the growth curve. Urbanisation methods have also been updated.
    • These methods rely on new descriptors from the FEH Web Service and NRFA Peak Flows datasets. For more information, see https://www.ceh.ac.uk/services/feh-2025-statistical-updates
    • In addition, this release implements the non-flood years method through the addition of a Generalised Logistic non-flood years distribution.
    • The software provides backwards compatibility with older projects using the 2008 statistical model, and while WINFAP 5.3 is designed to be used with Peak Flows Dataset versions 14 and above, earlier versions with a reduced descriptor set can be used. In these cases WINFAP automatically selects the 2008 method.

WINFAP 4

  • Download WINFAP4 4.2.7282
    Version: 4.2.7282 | Release date: 09 Dec 2019 | Checksum: ec28dd64983eedbe398898faaa3b2434

    • Release notes:

    • WINFAP 4.2 incorporates the Peak Flow v8 data.
    • There is no requirement for WINFAP 4.0 or 4.1 users to upgrade to WINFAP 4.2 if you have downloaded the Peak Flow v8 data from the NRFA website.
    • Note if you upgrade from WINFAP 4.0 or 4.1 to WINFAP 4.2 you will need to update the Load Options Station file path, as this will maintain your previous settings.
    • For new installations of WINFAP 4.2, your Load Options Station file path will automatically connect to Peak Flow v8 folder.