TR-55 Shallow Concentrated Flow

This number represents the sheet flow time computed for each column of shallow concentrated flow data. Flow velocity for this flow time is computed as:

Unpaved Surfaces	Paved Surfaces

	V	=	Average velocity (ft/sec.)
	S_f	=	Slope of hydraulic grade line (ft/ft)

T_c	=	Time of concentration (hr.)
L_f	=	Flow length (ft)
V	=	Average velocity (ft/sec.)