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(;O�E�y CENTER �8- iias <br /> .. <br /> ` � FOR DETERMINING THE VOLUME QF 5TORM RUNOFF, <br /> THE RATIONAL METHOp yVAS USED. THE DE'fENT10N <br /> � REQUtREMENTS WERE CALGuLATEO USING THE <br /> YRJANAINEN ANO WARREN METHOD PREStNTED IN THE <br /> �ECEMI3ER iy�3 IS5uE OF '� WATER ANO SEWAG-E WORKS� <br /> W'HIGH EC�UATES THE INSTANTANEOUS RATE OF INFI.�W <br /> WITH THE 1�15TANTANEOUS RATE OF OtJTFLOW lt� <br /> UEVELOP THE MAxIMUM Vo�uME OF 3ToRP+GE <br /> REqui aED. <br /> I. DETERMiNAT10N OF PEAK INF�oW FRoM <br /> �X15TING GON�ITION � <br /> QEXISTING i CEXISTING '� t1pyEAR x A <br /> AREA TG CEXISTING 11AV�AR A QEICISTINC� <br /> A 12.min, 0.40 I.SO in Jhr 0.30qcce5 O. 18 c{s <br /> , B io 0.4o I .63 0. i2 o.oe <br /> ; <br /> C lo 0 .40 1 ,�3 0.0� 0.04 <br /> WHERE T�= TIME OF GONGENTRATON OF RA�NFALL <br /> RUNOFF, OETERMINED FROM THE <br /> MAXIMUh1 LENGTH OF RVNOFF, THE <br /> GRout�D SLOPE, THE CHARAGTER OF <br /> TNE GRUVND COVER, AND DERIVED <br /> FROM TF�E ENCLDStD "OVERLQ,ND <br /> FL,OW 'T'IME." CHART ; <br /> C��;iSTiNG` RuNOFF FAG'iOR DERIVED FROM � �UNOFF <br /> FACTORS FOR SToFtM SE W ER 5"TABLE� <br /> 2 10 Y�R = RP+INFALL �I�,�TEN51Ty FOR STORM OF <br /> 10 yEqR FREQUENG�/ DERIVEp FROM <br /> �NGLOSEO ' RAINFALL (fyTENSITY- <br /> DuRAT�oN - �R�WuENGy ' GRAPH. <br />