Derive an expression for the time required to empty a tank with (i) a rectangular notch and (ii) a triangular notch A rectangular notch has a discharge of 0.5 m3/s when the height of water over the...

Derive an expression for the time required to empty a tank with (i) a rectangular notch and (ii) a triangular notch

A rectangular notch has a discharge of 0.5 m3/s when the height of water over the crest is half the breadth of the notch. If coefficient of discharge is 0.62, then find the breadth of the notch.