HEC-HMS
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The US Army Corps standard for rainfall-runoff modelling — event and continuous simulation, free to use.
Hydrology & Catchment AnalysisActiveHEC-HMSSCS Curve Number
1 tool · Topic
Unit hydrograph theory turns effective rainfall into a runoff hydrograph, and it is still the workhorse of event-based design hydrology. The tools below cover SCS dimensionless, Snyder and Clark unit hydrographs, plus libraries for deriving unit hydrographs from observed events.
The US Army Corps standard for rainfall-runoff modelling — event and continuous simulation, free to use.