Unit Hydrograph & Convolution

Route effective rainfall hyetographs through watershed Unit Hydrograph ordinates to compute Direct Runoff.

Watershed Inputs

DRH(t) = ∑ [ P(j) × UH(t - j + 1) ]

Time Interval ($\Delta t$ in hours)

Effective Rainfall Excess Values ($P$ in mm, comma-separated)

Unit Hydrograph Ordinates ($UH$ in m³/s per mm, comma-separated)

Time (hr)	DRH Flow ($Q$ in m³/s)