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~~~ ~- <br />\~'orlcshect 4: Graphical Pealc Discharge method <br />„sect klrtq/t'f` /~.ne Ey D W, Date !d-6 ~D¢ <br />`~ <br />cation ~d'~reaiv( Checked Date <br />Circle one: rese [ Developed <br />1. Data: )/qp ( /$k6 2 <br />Drainage area .......... Am = o•OOg~ o.olgL m12 (acres/640) <br />Runoff curve number .... CN = 7S (From worksheet 2) <br />Time of concentration .. Tc = o'2>y o.zS'~ hr (From worksheet 3) <br />Rainfall distribution type = ~ (I, IA, II, III) <br />Pond and swamp areas spread <br />Cliroughout watershed ...... _ ~ percent of Am ( acres or mil covered) <br />c,L / S~~ Z <br /> Storm 1 Storm 112 Storm I13 <br />2. Frequency ............................... yr ~~ ~ ~ <br />3. Rainfall, P (24-hour) ................... in /•-s /.5 <br />Initial abstraction, Ia ................. <br />(Use CN wi[h [able 4-1.) <br />5. Compute I /P ............................ <br />a ~ <br />in 0.667 0.667 <br />o.~¢S O,~s <br />6. Unit peak discharge, q ................. <br />u <br />(Use To and Ia/P with exhibit 4-,~ ) <br />7. Runoff, Q ............................... <br />(From worksheet 2). <br />csm/in ~s~-ZO ¢30 <br />in ©./6S O./6S <br />8. Pond and swamp adjustment factor, F ,... <br />P <br />(Use percent pond and swamp area <br />with table 4-2. Factor is 1.0 for <br />zero percent pond and swamp area.) <br />9. Peak dis clia rge, q ...................... <br />P <br />(Where qp = quAmQFP) <br />cfa 0,561 /.36z-- <br />t <br />D-9 (~10-VI-TR-55, Second 1•;d., June 1986) <br />