Which expression gives the discharge over a rectangular notch?
Correct answer D. 2/3 Cd b (2g)^1/2 H^3/2
Explanation
Integrating the velocity √(2gh) over strips of the notch from depth 0 to H gives Q = 2/3 Cd b √(2g) H^3/2, so discharge varies with head to the power 3/2.
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