2 tools · Topic

Time of Concentration Calculators

Almost every peak-flow method needs a time of concentration, and drainage manuals compute it in different ways — Kirpich, the NRCS velocity method, Kerby, Bransby-Williams. Listed here: WinTR-55, which applies the NRCS velocity method (sheet, shallow concentrated and channel flow), and Delta Hydro Studio, which has a browser Tc calculator.

Delta Hydro Studio

FreemiumVerified

Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.

Urban Stormwater & InfrastructureActiveRational Method Culvert Sizing

WinTR-55

Gov-Public

NRCS's official implementation of TR-55 small-watershed hydrology: peaks, hydrographs and storage.

Hydrology & Catchment AnalysisStableTR-55 SCS Curve Number