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<br />• DZTCB DESIGN <br />POND NO. 007- NORTH AND SODTH DITCH <br />In order to maximize coal recovery and to contain runoff from the <br />proposed disturbed areas, a contour ditch is required along the disturbed <br />areas east of Pond No. 007, flowing into Pond No. 007. For the design of <br />this ditch, the SEDCAD+ model was used to predict runoff from the <br />watershed. A 10-year, 24-hour precipitation event was used in the <br />design. <br />Following is a list of the main input factors which were derived in a <br />similar manner to the factors for Culvert C-103: <br />INPOT 007 NORTH AND SOOTH DITCH <br />Precipitation 2.0 inch <br />Drainage Area 255 acres* <br />CN 78 <br />L 4800 feet <br />Y 4.178 <br />tc 0.653 hr <br />ODTPDT <br />Q (cfs) 51.52 cfs <br />Based on this discharge, the computer program Storm Version 6.21 was used <br />to design the ditches. <br />u <br />• * - see Exhibit 2.05.3-5 <br />(4-5-94) <br />