Channel module

Inputs

• Discharge \(Q\)
• Channel slope \(S\)
• Material and Manning \(n\)
• Shape and constraints (triangular/rectangular/trapezoidal; side slopes, width limits)

Steps

1. Select channel segment/row and enter discharge and slope.
2. Select shape and material (or enter Manning \(n\)).
3. Run sizing:
4. compute \(y_n\) (normal depth)
5. compute \(y_c\) (critical depth)
6. compute velocity and regime classification
7. Adopt suggested dimensions or iterate with constraints.

Review checklist

• \(y_n\) is stable (small input changes don’t produce large oscillations).
• Regime classification is plausible for the slope and geometry.
• Velocities meet lining/protection requirements.