Laserfiche WebLink
. L <br /> Table 2 (at the back of this report) lists the outlet works discharge for each foot of <br /> elevation. <br /> Trash Rack Control Gate, and Inlet Structure Desian <br /> The trash rack and the inlet structure were designed in accordance with the <br /> procedures set forth in SCS Technical Release No. 464 (TR-46). The trash rack is <br /> comprised of several individual members which will be assembled on site and may be <br /> disassembled if necessary. The trash rack is designed for a minimum plugged loading <br /> condition of 25 percent of the maximum reservoir head, or 618 psf (39.6 ft * 62.4 Ib/sq-ft <br /> * 25% = 618 psf). For purposes of the trash rack design, maximum reservoir head is <br /> measured from the dam crest elevation (10,725 feet) to the elevation of the trash rack <br /> centerline 0 0,685.4 feet). <br /> The gross area of the inlet will be about 40.1 square feet with 24 percent bar area <br /> and 76 percent open area. The average velocity through the trash rack will be approxi- <br /> mately 1.48 feet per second for peak flow attainable at the normal water elevation (45 <br /> cfs). The velocity through the trash rack will be 0.80 feet per second for the maximum <br /> release rate under 10 feet of head (24.5 cfs). <br /> The inlet will include a 4-inch diameter vent to atmosphere, as recommended by <br /> TR-46, that will be installed along the side of the control stem. A 3-inch diameter pipe will <br /> also be installed alongside the stem to provide for the placement of a pressure transducer <br /> inside the 3-inch pipe at the inlet elevation for purposes of monitoring reservoir levels. <br /> A Hydrogate Model 501 sluice gate (or equivalent) including a 1 Y2-inch diameter <br /> encased stem, and geared crank lift, has been selected for the service. The stem supports, <br /> handwheel pedestal, and stem details have been specified based on TR-46 and the gate <br /> manufacturer's recommendations. The sluice gate and controls shall be designed for a <br /> minimum seating head of 45 feet and a nominal unseating head. The gate shall also be <br /> designed to accommodate throttling under high head conditions. <br /> 8 <br />