Partially Full Pipe Flow Calculations

Partially Full Pipe Flow Calculations - U.S. Units
II. Calculation of Discharge, Q, and average velocity, V
for pipes more than half full

Instructions: Enter values in blue boxes. Calculations in yellow
	Inputs

Pipe Diameter, D =		in
Depth of flow, y =		in
	(must have y > D/2)

Full Pipe Manning
roughness, n_full =
Channel bottom
	slope, S =	ft/ft

Calculations
n/n_full =
Partially Full Manning
roughness, n =


	Pipe Diameter, D =	ft
	Pipe Radius, r =	ft

	Circ. Segment Height, h =	ft

	Central Angle, q =	radians
	Cross-Sect. Area, A =	ft²

	Wetted Perimeter, P =	ft
	Hydraulic Radius, R =	ft
	Discharge, Q =	cfs
	Ave. Velocity, V =	ft/sec

pipe % full [(A/A_full)*100%] =