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<br />. <br /> <br />~:ti <br /> <br />; <br /> <br />located on the west bank of the river approximately 1/4 mile downstream <br />from the town of Durango. It would consist of an intake structure, a <br />set t 1 ing bas in to remove sed iment , and a pumping plant. The int ake <br />structure would be a 300-foot-long, concrete-lined structure leading from <br />the river to the settling basin. Approximately 150 cubic yards of <br />concrete would be placed in the river. It would have a side slope ratio <br />of 2: 1 and a maximum water depth of about 11.6 feet. A gate structure <br />would regulate diversions from the river to the canal, and a trashrack <br />would guard against debris clogging the gates or entering the settling <br />basin. A screen would be placed over the inlet to keep fish from <br />entering; fish would be rechanneled back to the river through a 300-foot- <br />long pipe. The settling basin, which would not be ~oncrete lined, would <br />have about 2 surface acres and a maximum water depth of 11.6 feet. The <br />settling basin is designed to remove particles of sediment 0.10 milli- <br />meter and larger. An estimated 6,300 cubic yards of sediment would <br />settle out annually, and removal of the deposited material would be <br />required about once a year. The material would consist primarily of fine <br />and medium sand, and could be used locally within a 5-mile radius for <br />building fill material, road construction, sanitary landfill cover, or <br />improving the Ridges Basin Reservoir shoreline. Design drawings for the <br />pumping plant are shown in Attachment 5. <br /> <br />r <br /> <br />The pumping plant would house 13 sets of electri- <br />cally-powered pump units, consisting of a vertical pump and a horizontal <br />pump connected in series ; operation and maintenance offices, and shops in <br />a building with about 18,000 square feet of floor space. A parking area <br />and substation would be located adjacent to the building. The pumping <br />plant would 'have the cspacity to deliver water at a rate of 430 cubic <br />feet per second (cfs) through a maximum static lift of 525 feet to the <br />reservoir and would have a peak electric requirement of 25,500 kilowatts <br />and an average annual energy requirement of 105,508,000 kilowatt-hours. <br /> <br />The Ridges Basin Inlet Conduit would begin at the <br />pumping plant and extend up the ridge that separates the reservoir basin <br />from the Animas River. It would parallel an existing county road and <br />have an overall length of about 2.1 miles. About 1.6 miles of the <br />conduit would be formed of concrete and steel pipe with an inside dia- <br />meter of 8.5 feet, buried about 5 to 10 feet below the ground surface, <br />and the remaining 0.5 mile would consist of concrete-lined tunnel. A <br />valve station would allow water to be delivered to an adjacent treatment <br />plant, to be constructed by the Durango area water users. The inlet <br />conduit would begin at 'an elevation of 6,453 feet and would end at an <br />elevation equal to the top of the reservoir's inactive pool (elevation <br />6,897.5 feet). The final 0.5 mile would consist of a tunnel bored <br />through the separating ridge, to hold to a minimum the pumping head <br />required to deliver water to the reservoir. The tunnel would allow <br />gravity releases back through the conduit to the treatment plant turnout <br />when water was not being pumped to the reservoir. Gravity releaaes would <br />be controlled by a gate chamber in the tunnel. The gates themselves <br />would be operated from a control house located about midway along the <br />tunnel portion of the conduit, <br /> <br />A-6 <br />