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
Time of Concentration Calculators
Almost every peak-flow method needs a time of concentration, and almost every drainage manual computes it differently — Kirpich, NRCS velocity method, Kerby, Bransby-Williams. These tools implement the common formulas with the unit handling and method choices made explicit, so your Tc is defensible.
WinTR-55
Gov-Public
NRCS's official implementation of TR-55 small-watershed hydrology: peaks, hydrographs and storage.
Hydrology & Catchment AnalysisStableTR-55SCS Curve Number