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Extracted text: A reservoir discharges through a sluice 0.915 m wide by 1.22 m deep. The top of the opening is 0.61 m below the water level in the reservoir and the downstream water level is below the bottom of the opening. Calculate (a) the discharge through the opening if C, = 0.60 and (b) percentage error if the opening is treated as a small orifice. %3D