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iioi��zr�N r•.i.r•.rtr•_n������� sci�oui. <br /> SUPPI.G;MliN7'AL CALCULATIOT� <br /> D1AY 9, 1989 <br /> petermine � yr. flow from site., syetem with no deLentions. <br /> Site Area = 12.53 Acres <br /> Impervious Area = 5.60 Acres <br /> Pervioue Area = 6,9 Acres <br /> CP = 6.{ 9110•21+15.60110.901 <br /> � 12,53 <br /> Cp = 0.51 Whole Site <br /> Aesume "C" valve for siLe If play field is excluded. CP = 0.80 <br /> Time of Concentrations. <br /> T�P, P1pe Flow, CII k16 to outlel see calculation sheet <br /> T�P = 18± minutes <br /> T�p, DiLch flow from fleld to outlet ' <br /> 270' overland flow, V = 1 FPS, S = 2% <br /> 500' ditch flow, V = 1 FPS, S = 0.5% <br /> T� = 10 + 270/1��1111 + b00/(601(1) = 22.83 minutes. <br /> Bas{n Areas T�p = 8.i6 acres, includes 8 minutea of conlributing area from <br /> fields. <br /> T�P = 10.41 acres, does noL include 0.24 asphalt by-pass or area <br /> to remain es {s, or creek area to be filled in. <br /> T�p, IS� = 1.2 inch/hour <br /> T�R, IS�� = 1.1 inch/hour <br /> q�P = (0.80111.2118.761 = 8.41 CFS „ .j <br /> 9;,p = 10.511(1.1)110.411 = 5,84 CFS I ' <br /> Desiqn qrase lined swele �or a peak deaiqn uf 8.41 CFS. <br /> To de;ign swale use the aide of inhle 11 and 12 from the "Handbook of Hydraulics" ' <br /> by Kii g, 4Lh edilion. <br /> J� / S _i/-S / <br /> SC� �,:�i: !1(�I�y.�J �n� <br /> d /� / <br /> ���..�r3��^�`5[� <br /> I <br />