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ORIFICE DESIGN: Q = Ca 2gh <br />where Q = Discharge, cfs <br />C = Coefficient of discharge <br />a = area of orifice, square feet <br />g = acceleration of gravity, ft. per sec.2 <br />h = head on the center of orifice, ft. <br />for c = 0.62 <br />Q = 0.357 <br />g = 32.2 <br />h = 3.9 <br />Q 0.35r <br />a - (0.62) - (2) (32.2)c3.9) <br />c �= — <br />a = 0.036 sq. ft. <br />a = 5.23 sq. in. <br />since a =1Y r2 <br />Radius = r =Y = 1.29 inches <br />:. D = 2.58 inches <br />r <br />