Delta Hydro Studio
FreemiumVerified
Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.
Urban Stormwater & InfrastructureActiveRational MethodCulvert Sizing
2 tools · Topic
Unit Hydrograph Software & Libraries
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.
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