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Design Features (Reference Figures 1 through 9, Appendix D) <br />Channel Cross Section <br />• The channel section has been designed for constructibility with Caterpillar <br />excavators (345, 365, or 375) as shown on Figure 3 <br />• The section has been designed for accessibility with the Company's JD690 <br />excavator for future maintenance dredging as shown on Figure 4. <br />• The channel will vary from 14 ft. deep at the inlet to 26 ft. deep near the outlet <br />(Figure 3). It will be a triangular section at the bottom with a maintenance bench <br />on one side (opposite the water pool) to allow the JD690 to reach the entire cross <br />section. <br />• The channel from the inlet to the new outlet gates (Station 50 +00) will be <br />trapezoidal with a bottom width of 10 feet. <br />• The side slopes have been designed at 2.25:1 based on stability analyses that <br />were performed by Kumar and Associates. The safety factor for static conditions <br />will exceed 1.5:1. The safety factor for rapid draw down will be minimal (1.1 to <br />1.2:1), but considered acceptable. <br />• The channel will carry 200 to 800 cfs at a maximum velocity of 3 cfs. <br />Channel Alignment <br />• Two alignments were considered. The preferred alignment is near the high water <br />line for the purpose of providing access and flexibility for future modifications if <br />they occur. <br />• All of the channel and associated structures will be on Company property. <br />• The total length will be 25,000 feet and the total volume excavated will be about <br />900,000 cy. <br />Outlet Works (Preliminary Design) <br />• The outlet will include four 72 "x72" high flow gates and one 12" canal gate for <br />releasing low flows. <br />• The gates will be equipped with electrical operators. <br />• The channel will be armored in the vicinity of the outlet with 18 -inch riprap, <br />granular bedding, and geo -grid reinforced earth. <br />• The outlet will initially be designed and equipped with a conventional trash -rack. <br />However, the Colorado Department of Wildlife has expressed interest in <br />equipping the outlet with fish screens to help preserve the fishery during high <br />flow reservoir releases. The current plan is to facilitate the addition of the fish <br />screens. <br />Sediment Control <br />• Bob Creek will be routed down a channel on the west side of the diversion dike <br />(Ref. Figure 3) to remove sediment. Access to the channel will be provided for <br />maintenance dredging if it is required. <br />Lake Meredith Res. Co. 3/7/03 <br />Feasibility of Outlet Channel Page 3 <br />