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<br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />JOB NO 96.001.00 DATE 1/31/96 <br />PROJECT Stevens Clay Mine <br />ONSITE FLOWS <br /> Time <br /> of Concentration RunAff <br />~ = T. + T <br /> r <br /> 1.8(l.l - C5 )~ <br />T. _ <br />! ~ <br /> O=CIA <br /> 1.81.1 - 0.1~ 300 <br />T. _ <br />r 3 10 <br />0 <br /> . A = 20.8Acres <br />T. = 14.5 min C -0.25 <br />is - <br /> <br />T t __ I C,~ =0.50 <br /> ~ For T = 21.2 min: <br />T <br />/ - 900 = 400 sec = 6.7min i,o=3.25 in/hr <br /> 2.25 <br />T =21.2 mint- rim=4.9in/hr <br />c <br />Q,o=16.9cfst- <br />O,~ = 51.0 cfs t- <br />Detention Volume <br />Assume Triangular Distribution to Calculate Total Volume of Run-off <br />V=1l2 • Base • Height <br />Base = 2 • T~ (T~ in Seconds) <br />Height = O <br />V,o = 1/2 ` 2`21.2'60`16.9 = 21.497 ft3 <br />V~~ = 1/2 ` 2.21.2'60.51.0 = 64.872 ft'- <br />