Question: Discharge of water through a rectangular channel width = 8 m , Q = 1 5 m ^ 3 / s , depth 1 .

Discharge of water through a rectangular channel width =8m, Q=15m^3/s, depth 1.5m. q=Q/w =1.875,
E=h+q^2/2gh^2 E=1.580
Derive an expression for critical depth in terms of q and g.
Specific energy E, is minimum at critical depth found by differentiating and equating dE/dh=0

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