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<br />. <br /> <br />Treatment Plants <br /> <br />. <br /> <br />Following are brief descriptions of the three Denver Water treatment plants: <br /> <br />. <br /> <br />The Marston Treatment Plant is located southwest of downtown Denver on the north <br />side of Marston Reservoir at an elevation of 5,503 feet. The plant treats South Platte, <br />Roberts Tunnel and Bear Creek water for distribution throughout the metro service area. <br />Marston has a capacity of 200 mgd. Raw water is delivered to Marston Reservoir and the <br />treatment plant by Conduit 20, which originates in Waterton Canyon, some 3 miles <br />upstream from the canyon entrance. Bear Creek water is delivered via Conduit 15, <br />which originates in the town of Morrison. Roberts Tunnel imports Colorado River water <br />from Dillon Reservoir. <br /> <br />. <br /> <br />. <br /> <br />The Moffat Treatment Plant is located west of downtown Denver in Lakewood at an <br />elevation of 5,636 feet. The plant treats water diverted through the Moffat Tunnel and <br />Gross Reservoir for delivery into Denver's distribution system, as well as water diverted <br />from South Boulder and Ralston Creeks. Moffat's capacity is 195 mgd. The plant was <br />updated in the early 1990s to meet anticipated new, more stringent water quality <br />regulations and to provide more reliable operations. Conduits 16 and 22 bring raw water <br />from Ralston Reservoir; Conduits 17,21,25, and 94 deliver treated water from the plant <br />to the service area. The plant has concrete underground reservoirs with a total capacity of <br />29 million gallons. <br /> <br />. <br /> <br />. <br /> <br />The Foothills Treatment Plant is located south of downtown Denver near Roxborough <br />State Park at an elevation of 5,880 feet. It is the newest of Denver Water's treatment <br />plants, coming on line in 1983. Foothills treats water from the South Platte collection <br />system and the Roberts Tunnel collection system. Its capacity is 250 mgd; the plant was <br />designed to be expanded to 500 mgd if warranted by future demand. Its relatively high <br />elevation allows Foothills to deliver treated water to most of the Denver area by gravity, <br />thereby reducing pumping costs. A hydro-electric turbine installed at Foothills produces <br />sufficient power to operate the plant, often with excess power to sell to local utilities. <br /> <br />. <br /> <br />. <br /> <br />Transmission and Distribution System <br /> <br />From the treatment plants, conduits deliver water either directly into the distribution <br />system or to pump stations and treated water storage reservoirs. The pump stations and <br />reservoirs in turn deliver water to the distribution system, which is divided into more <br />than 140 pressure zones. The distribution system is generally configured so that water <br />from large conduits is distributed into a grid of 12-inch pipe on about one-half-mile <br />centers. The 12-inch pipe grid in turn delivers water into the local 6-inch and 8-inch <br />distribution pipe. The system is designed for "dual feed" to any area to minimize service <br />interruption and to maintain fire protection capability when one source of water is <br />interrupted. Treatment plants are sized for maximum day demand; that is, they must be <br />able to deliver enough water to supply the highest single day demand, usually on a hot <br />summer day. Distribution pipe is sized either for a maximum hour demand, or <br /> <br />. <br /> <br />. <br /> <br />21 <br />