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An uncontrolled spillway, 8 m high and 75 m long will be designed with an appropriate...

An uncontrolled spillway, 8 m high and 75 m long will be designed with an appropriate type of energy dissipation structure and tailrace section in rectangular cross-section having lengths of 75 m. The tailrace channel has a Manning’s roughness coefficient of n=0.025 and a slope of S0=0.0006. Determine the depth Δ to be excavated for Q0= 450 m3 /s.

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