An artificial lake is impounded by an earth dam with a square-edged orifice 12 inches by 12 inches for drawdown. The elevation of the surface of the lake is 928.75, and the invert of the orifice is...

An artificial lake is impounded by an earth dam with a square-edged orifice 12 inches by 12 inches for drawdown. The elevation of the surface of the lake is 928.75, and the invert of the orifice is 905.25. When the orifice is opened, what discharge in cfs flows through into the stream below the dam?