Input
SCS only
Results
Lag time tp (hr)—
Peak time Tp (hr)—
Peak discharge qp (m³/s)—
Base time tb (hr, SCS only)—
Volume check (m³ from 1 mm)—
Method
SCS triangular: Tp = tr/2 + tp; tp = 0.6·Tc; for 1 mm runoff over A, qp = 2·V/(Tp·3600·1.67), tb = 2.67·Tp. Snyder: tp = Ct·(L·Lc)^0.3 [hr]; Qp_per_km² = Cp·640/tp [cfs] or in SI Qp = 2.75·Cp·A/tp [m³/s].