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<br />I <br />i <br />I <br />I <br />r <br />t <br /> <br />3 <br /> <br />t- <br /> <br />Worksheet 4: Graphical Peak Discharge method <br /> <br />~ <br /> <br />Project <br /> <br />'. <br />, <br /> <br />Location <br /> <br />Circle on~: Present Developed <br /> <br />8y_ <br /> <br />{ <br /> <br />Date <br /> <br />Checked <br /> <br />Date <br /> <br />1. Data: <br /> <br />Orainage arca .......... Am . <br /> <br />Runoff curve number .... eN . <br /> <br />Time of concentration " Te . <br /> <br />Rainfall distribution type . <br /> <br />Pond and swamp areas spread <br />throughout watershed ...... . <br /> <br />1112 (acres/640) <br />(From worksheet 2) <br />hr (From worksheet 3) <br />(t, lA, II, Ill) <br /> <br />percent of Am (_____ acres or mi2 covered) <br /> <br />2. Frequency............................... yr <br /> <br />3. Rainfall, P (2..-hour) ................... tn <br /> <br />4. <br /> <br />Initial abstractIon, I ................. <br />a <br />(Use CN with table 4-1.) <br /> <br />5. <br /> <br />Compute I Ip <br />a <br /> <br />............................ <br /> <br />6. Unit peak discharge, ~ ................. c.m/in <br />u <br />(Use_Tc and IalP with exhibit 4-_____) <br /> <br />7. Runoff, Q ............................... 1n <br />(From worksheet 2). <br /> <br />8. <br /> <br />Pond <br />(Use <br />..lth <br />zero <br /> <br />and swamp adjustment (actor, Fp <br />percent pond and swamp area <br />table 4-2. Factor ia 1.0 for <br />percent pond and swamp area.) <br /> <br />9. <br /> <br />Peak discharge, q ...................... <br />p <br />(Where qp . quAmQFp) <br /> <br />0-4 <br /> <br />.... <br /> <br />Storm '1 <br /> <br />Storm,2 Storm'3 <br /> <br />in <br /> <br />I I I I , <br />I I I I <br />I I I I <br />,... I I I <br />I I I I <br /> <br />ell I <br /> <br />. <br />. <br />t <br />, <br /> <br />(210-Vl.TR.55, Second Ed., June 1986) <br />