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� i <br /> DRAINAGE SiUDY FOR <br /> SUMI1Ii WESTERN 72-UNIT APAi2Tf9ENT COMPLEX <br /> April 9, 1985 I <br /> REViSED APRIL 26, 1905 <br /> I , PEAK RUNOf'F RAfE FOR 10-YEAR STORM <br /> RATIONAL �dETHOD: p = CIA WHERE : C c Runoff Coefficient <br /> I = Rai�fall Intensity <br /> A c Acres, Area <br /> T = Time of Concentration <br /> c <br /> UNDEVELOPED CDNDITIONS <br /> A = 2.46 <br /> C = 0.10 (From Table 1J <br /> i� = 10 + 475 - 20. 5 (Velocity from Figure 1 ) <br /> 0 .75 <br /> I = 1 .27 (Chart 18) <br /> Q = �0.10) ( 1 . 27) ( 2.46) - 0. 31 <br /> II , RUNOFF COEI-FICIENT AVERAGE <br /> �Dev ° 0.60(0 .20) + 1 .06(0, 90) - 0 . 73 <br /> 2. <br /> III . MAXIMUM OUTFLOW PER ACRE IMPERVIOUSNCSS (CFSf AC <br /> Qo = Allowable Outflow <br /> creage x RunoPf Coefficient Cp) <br /> Qo = 0. 31 <br /> 2 .4b x 0.73 <br /> Q = 0 .17 <br /> 0 <br /> IU . STORAGE TIME ( 25-YEAR STORhi) <br /> The instant storage beg:ins unCil the peak storage is attained (Min) . <br /> T = -25 + 2706 <br /> Qo <br /> T - -25 + 2706 <br /> (�. 17 <br /> 1 <br />