Open Channel Section Design
Trapezoidal open channel (sewage/rainwater), non-full flow, n=0.025. Section design and earthwork volume.
| No. | Start | End | Length L (m) | Design Qs (m³/s) | Channel H (m) | Water depth h (m) | Bottom width b (m) | Side slope a | Slope i (‰) | Invert ↑ (m) | Top width (m) | Earthwork (m³) | v (m/s) | Capacity Q (m³/s) | ΔH (m) | Invert ↓ (m) | ΔQ |
|---|
Max velocity
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m/s
Design flow ΣQs
—
m³/s
Capacity ΣQ
—
m³/s
Earthwork ΣV
—
m³
Trapezoid flow area A = b·h + h²/a. Manning velocity v = (A/(b+2·(h²+(h²/a)²)))^(2/3)·√(i/1000)/n with n=0.025; capacity Q = A·v. Top width = b + 2·H/a; earthwork = (b·H + H²/a)·L. Capacity must be no less than design flow.