Understand that open-channel flow velocity depends on the channel's shape (through the hydraulic radius), its slope, and its surface roughness — steeper and smoother channels flow faster.
Velocity
1.73 m/sDischarge
5.19 m³/sHydraulic radius: R = A / P (A = b·y, P = b + 2y for a rectangular channel)Manning's equation: V = (1/n) · R^(2/3) · S^(1/2)Discharge: Q = V · ARaise the slope to 0.005 or higher (keeping width, depth, and roughness at their defaults). Confirm velocity climbs above 2 m/s.
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