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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Determine Length of Spillway <br /> <br />Assumptions: <br /> <br />-Uncontrolled discharge over the earthen dike which approximates <br />an Ogee Crest. <br /> <br />-Height of water above the crest is two (2) feet. <br /> <br />-C --coefficient of discharge = 3,0 to 3,3 <br /> <br />-Q --10,400 cfs <br /> <br />Q = C L H 3/2 <br />e <br /> <br />-Design of Small Dams P,373 <br /> <br />10,400 cfs = 3.3 (L) 23/2 <br /> <br />23/2L = 10,400 <br />3.3 <br /> <br />2.83 L = 3151.52 <br />L = 1,113.61 feet <br /> <br />Assume total L. F. of spillway required = <br /> <br />1250 L.F. <br /> <br />If C = 3.0 then <br />2.83 L = 3466.67 <br />= 1,224.97 feet <br /> <br />Average velocity over the crest assuming <br />a depth of 2' over the crest, <br /> <br />v -Q <br />- A <br />V 10,400 cfs <br />= (2) ft2 <br /> 1,250 <br />V = 4.16 ft/sec. <br />