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Figure 6 <br />Ralston Reservoir End-of--Month Storage Contents <br />ia,ooo <br />~ io,ooo <br />s,ooo <br />0 <br />~, 6,000 <br />0 <br />~ 4,000 <br />0 <br />w <br />0 <br />W 2,000 <br />0 <br />O M ~O O~ N ~ W ~ ~ O M ~ ~ N ~ W ~ <br />~n ~n ~n ~n ~O ~O ~O l~ l~ l~ o0 00 00 0o O~ O~ O~ O O <br />ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti <br />PHYSICAL INFORMATION -SOUTHERN SYSTEM <br />The Southern system includes the Roberts Tunnel collection system that conveys transbasin <br />water from Dillon Reservoir in the Blue River basin. The Southern system is currently used to <br />satisfy about 75 to 80 percent of the Denver Water annual demand, which includes a number of <br />treated water service contracts for southern and western municipalities outside of the City and <br />County of Denver, but within the Denver Water service area. <br />The major structural elements in Denver Water's Southern system are the Roberts Tunnel and <br />Roberts Tunnel Power Plant, Antero Reservoir, Eleven Mile Reservoir, Cheesman Reservoir, <br />Strontia Springs Reservoir and Foothills Water Treatment Plant, Conduit No. 20, Platte Canyon <br />Reservoir, Marston Reservoir and Marston Water Treatment Plant, High Line Canal, and <br />Chatfield Reservoir. The history, operations, and current specifications of these elements of <br />Denver Water's infrastructure are summarized below. <br />5) Roberts Tunnel (Structure ID 0800653) <br />Denver Water owns and operates Roberts Tunnel and Dillon Reservoir, which brings transbasin <br />water into the southern part of the Denver Water system. Dillon Reservoir was completed and <br />started filling in 1963. Operations of Dillon Reservoir and the Roberts Tunnel began in 1964. <br />Further information related to the Colorado River basin components of the Denver Water system <br />is included in the documentation for the Upper Colorado River Water Resources Planning <br />Model. <br />Denver Water Board Operating Memorandum 12 of 40 <br />