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Exhibit 39 <br />DWDA Expansion - TR -60 <br />Notes for Calculations: <br />1. In order to maintain continuity between the initial Exhibit 39 evaluation and the <br />DWDA expansion part of TR -60, a curve numbers of 94 for newly graded areas was <br />used to evaluate the peak flows for Ditches D -12 and D -14. <br />2. Ditches are shown on Figure 2e and discussed in Section 2.05.3(4) <br />3. Peak flow for ditches and culverts were calculated with SedCad 4.0. Ditches have <br />minimum freeboard =0.3'. Based on previous documentation by River City Consultants <br />(RCC), ditches 12 and 14 have a bottom width of 3.0', side slopes of 1:1, minimum <br />slope of 1.0% and are 1.5 feet deep. Existing conditions have been applied to <br />proposed ditch designs for D -12 and D -14. <br />9. Culvert C -13 has been evaluated for capacity. Based on previous documentation by <br />RCC, C -13 is a 24" culvert. A 24" culvert is adequate to carry the increased flows from <br />the DWDA expansion. <br />ENGINEER'S CERTIFICATION <br />The calculations and infor ted on pages EXH. 39 -12 through 39 -24 with a <br />date of 10/11 were prep ��%L e month of October 2011, and the information <br />presented is true and c re, t e y knowledge and belief. <br />43402 y; <br />Ta meri er,f3i Wh-�gineer E. Date <br />Registered slid <br />State of Colorado No. 43402 <br />TR -60 Page EXH. 39 -11 10/11/11 <br />