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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Revised 7/8/E2 <br />Flow Through Orifice <br />Orifice Diameter 2.5 inches <br />Factor C = .60 <br />Q = Ca(2gh)1/2 <br />J <br />From Civil Engineering <br />Handbook, Leonard Church <br />Urquhart, Editor, McGraw <br />Hill, 4th Edition, p. 4-35 <br />where C = entrance factor <br />a = Area of orifice <br />q = 32.2 ft/sect <br />h = head in feet <br />elevation of orifice 6001.5 <br />head (ft) Q flow (cfs) <br />.10 .05 <br />.20 .07 <br />.30 .09 <br />.40 .10 <br />.50 .12 <br />.60 .13 <br />.70 .14 <br />.80 .15 <br />.90 .16 <br />1.0 .16 <br />2.0 .23 <br />3.0 .28 <br />4.0 .33 <br />