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The DWDA will be expanded by 0.6 acres in order to provide additional storage until a <br />new DWDA can be permitted. <br />Runoff from the DWDA will be routed to culvert C13 via ditches D12 and D14. It is <br />assumed that half of the runoff from the 0.6 acre expansion will go to D12, and half will <br />go to D14. <br />Ditches 12 and 14 have been designed for the 100 -year, 24 -hour event. Ditches 12 <br />and 14 as currently approved (per TR -60) have adequate capacity to safely pass the <br />runoff from the DWDA expansion. The revised SedCad design for each ditch follows. <br />Table 21 lists C13 as 21" culvert, however, a field locate determined that it is actually a <br />24 ", therefore, C13 has adequate capacity to handle additional flow from the DWDA <br />expansion. Culvert C13 has been designed for the 10 -year, 24 -hour event. C13 has <br />requires an HW /D = 1.1 in order to convey to design flow. <br />Until this point, a curve number of 94 has been used for the DWDA. For this analysis, <br />the CN will remain 94, however, 90 is generally accepted by the Division for refuse and <br />will be used for hydrologic analyses pertaining to refuse in the future. <br />ENGINEER'S CERTIFICATION <br />The calculations and inf <br />with a date of 04/20/1 <br />correct to the best of <br />Exhibit 19(23) <br />DWDA Expansion <br />Tammer "��'p�3;�' p Date <br />Registered Pro ngineer <br />State of Colorado No. 43402 <br />ed on pages EXH. 19(23) -1 through 19(23) -11 <br />me, and the information presented is true and <br />lief. <br />4 - Lc= -1z <br />MR -112 EXH 19(23) -1 4 -20 -2012 <br />