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c- <br /> DRAINAGE STUDY FOR <br /> GENERAL TELEPHONE COMPANY OF THE NORTHWEST <br /> CASINO ROAD PNHKING LOT <br /> I . PEAK RUNOFF RATE FOR 10-YEAR STORM <br /> RATIONAL METHOD: Q = CIA WHERE : C = Runoff Coefficient <br /> I o Rainfall Intenaity <br /> A = Acres , Area <br /> T = Time of Concentration <br /> c <br /> UNDEVELOPED CONDITIONS <br /> A e 0.62 <br /> C c 0.10 (From Table 1) <br /> T� e 10 + 250 - lk (Velocity from Chart 1) <br /> 60 1 .0 <br /> I e 1.57 (From Chert 18) <br /> q = (o. io) (i .s�> (o.6z) = o.io <br /> II . RUNOFF COEFFICIEN7 AVERAGE <br /> Impervious Area Lendacaped Area <br /> �Dev ° {0.90) (0. 51 ) + (0. 2) (0.11) <br /> 0.62 <br /> = 0.78 <br /> III . MAXIMIJM OUTFLOW PER ACRE IMPERVIOUSNESS (CFS/AC) <br /> Q e Allowable Dutflow <br /> ° Acreage x Runoff Coefficient CD <br /> Qo = 0.10 <br /> 0,62 0.78) <br /> Q c 0.207 <br /> 0 <br /> 2 <br /> 9/2B/83 <br /> J <br />