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WINFAP 5 from Wallingford HydroSolutions is a specialist hydrological analysis package designed to generate statistically robust estimates of peak river flows and complete flood frequency curves for both gauged and ungauged catchments across the United Kingdom. The program embeds the procedures and datasets of the current Flood Estimation Handbook (FEH) so that engineers, planners and environmental consultants can quickly derive design flows required for flood-risk mapping, reservoir safety checks, bridge and culvert sizing, drainage system design and insurance modelling. Users typically import catchment descriptors or observed flow series, select an appropriate statistical distribution, and let the software compute growth curves that translate to peak discharges for return periods from two to 10 000 years; complementary tools support pooling groups, QMED adjustment, urbanisation corrections and confidence interval calculation. The single maintained release, version 5.2.9046.25885, replaces earlier legacy editions and is distributed as a native Windows desktop application that runs on 64-bit Windows 10 and 11 workstations, storing projects in compact XML-based workspaces that integrate with GIS layers and FEH Web-Service feeds. As the only commercial implementation endorsed by the Environment Agency for formal FEH methods, WINFAP 5 is routinely used by local authorities, water companies, civil engineering consultancies and academic researchers who need defensible, auditable flood estimates that satisfy regulatory standards. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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