Manning's equation
on a trapezoidal open channel ( By Eng. Hosam El Nagar )
Parameters
Bottom width ( b )
m
Water depth ( y )
m
Side slope ( Z : 1 )
: 1
Bed slope ( S )
Manning's ( n )
Smooth concrete — 0.013
Earth canal — 0.022
Gravel bottom — 0.025
Natural winding stream — 0.040
Cross-section
Results
Area (A)
—
m²
Wetted perimeter (P)
—
m
Hydraulic radius (R)
—
m
Velocity (V)
—
m/s
Discharge (Q)
—
m³/s
—
mcm/d =
—
bcm/y
Flow regime
—
—
—
Top width (T)
—
m
Hydraulic depth (D)
—
m