1Channel & Flow Parameters

Set the geometry, then pick the unknown to solve for — flow or depth. US customary units.

Bottom width bmay be 0 (triangular)

Side slope zz H : 1 V · 0 = vertical

Channel slope S

Manning's n

–

solve

Flow Qdischarge capacity

cfs

solve

Depth dnormal depth of flow

2Result

Discharge — Q —

Top width — T

—ft

Velocity — V

—ft/s

Calculation audit

Q = (1.486/n)·A·R^(2/3)·S^(1/2) | A = (b+z·d)·d | P = b+2d√(1+z²) | R = A/P (ft, cfs)

includes 1.0 ft freeboard · vertical scale exaggerated