HEC-HMS
FreeVerified
The US Army Corps standard for rainfall-runoff modelling — event and continuous simulation, free to use.
Hydrology & Catchment AnalysisActiveHEC-HMSSCS Curve Number
HEC-SSP
ActiveStatistical hydrology from HEC: Bulletin 17C flood frequency, volume-duration and general frequency analysis.
by US Army Corps of Engineers (HEC)
- Pricing
- Free
- License
- US Government (public domain)
- Commercial use
- Permitted
- Ecosystem
- Standalone
- Platform
- Windows
About HEC-SSP
HEC-SSP (Statistical Software Package) is the Hydrologic Engineering Center's tool for the statistical side of hydrology. Its flood-frequency module implements Bulletin 17C — including the Expected Moments Algorithm, Multiple Grubbs-Beck low-outlier screening, historic flood data and regional skew — which makes it one of the two standard ways (with USGS PeakFQ) to produce a defensible flood-frequency curve in US practice.
Beyond peak-flow frequency it handles volume-duration frequency, distribution fitting, duration analyses and curve combination. It reads USGS gauge data directly and exchanges data with other HEC software via DSS, so it slots naturally into a HEC-HMS/HEC-RAS workflow.
Where it fits in the workflow
TerrainCatchmentRainfallRunoffRoutingHydraulicsMappingReporting
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