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Worksheet =l: Graphical Peak Discharge method <br />Project SDH~4 <br />By IIf'~ Date 7.-1-93 ?_.:.., -!~,1~, <br />~Locacion Fl~CCFSS ROP,D ~jp~Cl~ Checked Date <br />Circle one: Present Developed <br />1. Data: <br />Drainage area .......... Am ~ 0.148 mil (acres/640) <br />Runoff curve number .... CN ~ 84 (From worksheet 2) <br />Time of concentration .. Tc ~ o111vhr (From worksheet 3) <br />Rainfall distribution type ~ II (I, IA, II, IZI) <br />Pond and swamp areas spread <br />throughout watershed ...... ~ 0 percent of m ( acres or miZ covered) <br />2. Frequency ............................... <br />3. Rainfall, P (24-hour) ................... <br />initial abstraction, Ia ................. <br />(Use CN with cable 4-1.) <br />5. Compute Ia/P ............................ <br />6. Unit peak discharge, qu ................. <br />(Use Tc and Ia/P with exhibit 4- ) <br />7. Runoff. Q ............................... <br />(From worksheet 2). <br />8. Pond and swamp adjustment factor, Fp .... <br />(Use percent pond and swamp area <br />with cable 4-2. Factor Is 1.0 for <br />zero percent pond and swamp area.) <br />9. Peak discharge, qp ...................... <br />(Lthere qp ~ quAmQFp) <br />• <br />yr <br />in <br />~ 0.381 <br />0.272 <br />csmlin 510 <br />in <br />1.0 <br />cfs 27 <br />42-12 <br />