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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 this version if you purchased WINFAP from WHS. This version is licensed to a single PC.

    Download WINFAP5 5.3.9411 - Standalone licence
    Version: 5.3.9411 | Release date: 07 Oct 2025 | Checksum: 7c8e5bb96378b067badb30189e1c929f

    • 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 Flow Dataset versions 14 and above, earlier versions with a reduced descriptor set can be used. In these cases WINFAP automaticaly selects the 2008 method.
    • Release 5.3.9399 includes performance improvements in opening WINFAP, clarification in the report of the urbanisation parameters for the 2025 method and amendment of the copy functionality from the QMED donor table to ensure values reflect those on the screen.
    • Release 5.3.9403 corrects the adjustment to the L-CV when urbanisation is modified using the 'Edit Urban Parameters' dialog.
    • Release 5.3.9411 corrects the selection of 'small catchment' reccommendations options. Users will not be allowed to select this for the 2008 method where catchments are greater than 40km2. For the 2025 method the misleading 'tick' for catchments less than 20km2 is removed.

  • Network licence

    Download this version if you purchased WINFAP from our reseller, Jacobs. This version uses network and cloud-based licensing which will enable any user across your organisation to access the software, even remotely via VPN, as long the number of concurrent users does not exceed the licensed limit.
    See the Jacobs website for more information and FAQs

    Download WINFAP5 5.3.9411 - Network licence
    Version: 5.3.9411 | Release date: 07 Oct 2025 | Checksum: 3e70d562de2f555eab026ce2a9e113d2

    • 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 Flow Dataset versions 14 and above, earlier versions with a reduced descriptor set can be used. In these cases WINFAP automaticaly selects the 2008 method.
    • Release 5.3.9399 includes performance improvements in opening WINFAP, clarification in the report of the urbanisation parameters for the 2025 method and amendment of the copy functionality from the QMED donor table to ensure values reflect those on the screen.
    • Release 5.3.9403 corrects the adjustment to the L-CV when urbanisation is modified using the 'Edit Urban Parameters' dialog.
    • Release 5.3.9411 corrects the selection of 'small catchment' reccommendations options. Users will not be allowed to select this for the 2008 method where catchments are greater than 40km2. For the 2025 method the misleading 'tick' for catchments less than 20km2 is removed.

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.