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Appendix Exh7-14L -Taylor Ditch <br />The Taylor Ditch is located in the NW/4 of Section 9, T3N, R93W. The alignment of this ditch <br />is shown on Map 41. The design profile is provided on Map 33A. This channel was redesigned <br />following a revision to the postmining topography approved under TR-63. <br />The ditch is designed to meet the requirements of Rule 4.05.3 for drainages less than one square <br />mile. The drainage area of this basin is about 27 acres. This requires that the channel be capable <br />of handling flows from a 10 year, 24 hour event. As shown on the profile, the steepest portions <br />within the channel have a slope of about 25 percent. The overall length of the channel is about <br />1,500 feet. <br />As shown on the attached SEDCAD printout, the design storm produces a peak discharge of <br />about 0.03 cfs and a total runoff volume of about 0.01 acre-feet at Station 0. This design event is <br />based on a Curve Number of 56 and assumes that the entire drainage area is contributory to the <br />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. 7-14L-2 Revision Date: 7/25/06 <br />Revision No.: TR-63 <br />