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<br />lob Ie 2 SOLUTION OF RATIONAL EQUATION PARAMETER "C" <br /> <br />RATIONAL EQUATION Q=CIA PROJECT: CRIPPLE CREEK <br />Q=CFS (FOR GIVEN FREQUENCY) <br />C=RUNOFF COEFICIENT <br />I=IN/HR RAINFALL INTENSITY = (1.0/DUR)*CI.*P) <br />A = ACRES OF CONTR IllUT! NG DRA I NAGE AREA <br />DUR=DURATION FOR DETERMINING I <br />%=PERCENT OF 24 HR PRECIP FOR OUR <br />P=2:4 HR PREClP <br /> <br />NOTE: DETERMINE I USING A DURATION APPROXIMATELY EQUAL TO <br />TIME OF' CONCENTFMTION <br />DURATION FOR DETERMINING I (DUR) = <br />% OF 24 HR PF<ECIF' FOR ABOVE DURATION (%) = <br /> <br />0.5 HR <br />37.8 % <br /> <br />************************************************************************ <br />Frequency Area <br />10 yr ~:;O yr 100 yr Ac eN <br />*********************;~************************************************** <br />24 hr P 2.03 3.25 3.93 <br />X*P 0.77 1.2:;: 1.49 <br />I (I n/Hr) 1.53 2:.4';, 2:.97 <br /> <br />See 14(J3) <br />Q 38 99 137 <br />C 0.39 0.63 0.72 <br />See 20(E) <br />Q 7c. 20~' 281 <br />C 0.35 0.59 0.67 <br />See 22(F) <br />0 :-:7 95 131 <br />C 0.3E: 0.60 0.69 <br />See 34 ((I ) <br />Q 36 104 147 <br />C 0.34 0.60 0.71 <br />See 32(P) <br />Q 10 2:9 4~ <br /> ~ <br />C 0.20 0.37 0.44 <br />See 28(0) <br />0 36 tOE, 148 <br />C 0.27 0.50 0.58 <br />See 26(R) <br />0 26 P 102 <br />C 0.33 0-:58 0.67 <br />See 46(H) <br />Q 109 276 379 <br />C 0.41 0.65 0.74 <br />See 58(J) <br />Q 12::: 324 444 <br />C 0.41 O.C.4 0.73 <br />See 36(S) <br />0 58 160 224 <br />C 0.33 0.57 0.66 <br /> <br />64 80 <br /> <br />141 80 <br /> <br />64 81 <br /> <br />70 79 <br /> <br />32 77 <br /> <br />86 78 <br /> <br />51 79 <br /> <br />173 81 <br /> <br />205 81 <br /> <br />115 79 <br />