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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 g:avity, ft. per sec . 2 <br /> h = head on the center of orifice, ft. <br /> for C = 0.62 <br /> Q = 0.395 <br /> 4 = 32.2 <br /> h = 3.44 <br /> Q 0 395 <br /> a - - (0. 62) (2) (32 . 2) (3.441 <br /> C �gTi <br /> a = 0.043 sq. ft. <br /> a = 6.192 sq. in. <br /> since a =� r2 <br /> . . Radius = r =� = 1.40 inches <br /> , . D = 2•80 inches ' <br /> _a- � <br />