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<br />. <br /> <br />IVlNnSOR DITCH <br /> <br />. <br /> <br />Cross Section of Most Restrictive Point on the Windsor <br />Ditch - at County Road Overpass Immediately North-east <br />of Wellington. <br /> <br />I <br />I. <br /> <br />25' <br /> <br />5.7' <br /> <br />5.4' <br /> <br />. <br /> <br />6.9' <br /> <br /> <br /> <br />. <br /> <br />Cross Sectional Area = 156 square feet <br /> <br />= A <br /> <br />Using Manning Formula, <br /> <br />Q = A(1.49) (R)2/3 (S)1/2 <br />c <br />n <br /> <br />. <br /> <br />Slope (from field profiles) = .002125 <br /> <br />= S <br /> <br />(NOTE: Average slope for entire length of ditch in <br />question = .00225) <br /> <br />. <br /> <br />Roughness Coefficient* ; ,0020 <br /> <br />; n <br /> <br />Hydraul ic <br /> <br />Radius <br /> <br />R ; 156 <br />37.1 <br /> <br />; 4.205 <br /> <br />= R <br /> <br />. <br /> <br />QG ; 156 (1.49) <br /> <br />(4.205)2/3 (.002125)1/2 <br />0.20 <br /> <br />. <br /> <br />. <br /> <br />*Data Book for Civil Engineers, Elwyn Seeyle, 3rd Edition, Vol. 1, <br />Page 18-68 (Canals and Ditches) <br /> <br />. <br /> <br />IiJUI1JHT K <br />