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<br />. <br /> <br />NORTII POUDRE DlTCII <br /> <br />. <br /> <br />Cross Section of Most Restrictive Point on the <br />North Poudre Ditch-at East Edge of C & S Rail- <br />road Over-pass, <br /> <br />. <br /> <br />4.5' <br /> <br />26' <br /> <br />17.5' <br /> <br />- - <br /> <br /> <br />4.1. <br /> <br />IS' ;:::::;;-" <br />r- <br /> <br />. <br /> <br /> <br />~ 26' <br /> <br />. <br /> <br />Cross Sectional Area = 215 Square feet <br /> <br />= A <br /> <br />I <br />I. <br /> <br />Q = A(l,49)(R)2/3 (S)1/2 <br />c <br />n <br />Slope (from field profiles) = .008 or 0.8% ; S <br /> <br />Using Manning Formula, <br /> <br />Roughness coefficient* <br /> <br />= .025 <br /> <br />= n <br /> <br />. <br /> <br />Hydraulic Radius <br /> <br />R= area of x-section <br />wetted perimeter <br /> <br />R; ~ =3.909 <br />55 <br /> <br />(1.49) (3.909)2/3 (,008)1/2 <br />0.025 <br /> <br />= <br /> <br />R <br /> <br />. <br /> <br />~ = 215 <br /> <br />See Computer Print-out for capacity <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />*Data Book for Civil Engineers; 3rd Edition, Vol. 1, Elwyn Seelye <br />Page 18-68 (Canals and Ditches), <br /> <br />EXHIBIT J <br />