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Appendix Exh7-14I -East Taylor Ditch <br />The East Taylor Ditch is located in Sections 4, 9, and 16 of T3N, R93W. The alignment of the <br />East Taylor Ditch is shown on Map 41. The design profile is provided on Map 33A. The upper <br />portion of this channel was redesigned following a revision to the postmining topography <br />approved under TR-63. <br />The ditch is designed to meet the requirements of Rule 4.05.4 for drainages greater than one <br />square mile. The drainage area of this basin is about 675 acres. This requires that the channel be <br />capable of handling flows from a 100 year, 24 hour event. As shown on the profile, the steepest <br />portions of the channel have a slope of about 13 percent. The overall length of the channel is <br />about 15,000 feet. <br />As shown on the attached SEDCAD printout, the design storm produces a peak discharge of <br />about 16 cfs and a total runoff volume of about 8 acre-feet. This design event is based on a <br />Curve Number of 56 and assumes that the entire drainage area is contributory to the channel. <br />For ease of construction, a trapezoidal channel cross-section 12 feet in width will be employed. <br />Channel side slopes will be 3H:1 V slopes and a minimum depth of 4.0 feet will be used. For <br />design consistency, an average riprap diameter of 18 inches will be used. Using Figure 3 of <br />Exhibit 7, Item 14H, it can be determined that this size is more than adequate for the peak flow <br />and channel slope involved. <br /> <br />Exh. 7-14I-2 Revision Date: 7/25/06 <br />Revision No.: TR-63 <br />