The head of water over an orifice of diameter 10 cm is 12.5 m. The water issued from the orifice is collected in a rectangular tank of size 2 m × 0.95 m and the rise of water level was observed 1.2 m...

The head of water over an orifice of diameter 10 cm is 12.5 m. The water issued from the orifice is collected in a rectangular tank of size 2 m × 0.95 m and the rise of water level was observed 1.2 m in 30 seconds. Determine the coefficient of discharge.