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Reservoir. Easement Amendment No. 4, dated April 15, 2004, allows the summer period flow <br />reductions as follows: <br />• During Stage 1 drought response, as defined by voluntary water restrictions, Denver Water <br />may divert and recover 15 cfs of the 60 cfs at the Old Last Chance Ditch diversion (Structure <br />ID 0801002) at Chatfield Reservoir, leaving 45 cfs in the stream channel. <br />• During Stage 2 drought response, as defined by mandatory water restrictions, Denver Water <br />may divert and recover 30 cfs of the 60 cfs at the Old Last Chance Ditch diversion at <br />Chatfield Reservoir, leaving 30 cfs in the stream channel. <br />• During Stage 3 drought response, as defined by total constraint of outdoor lawn watering, <br />Denver Water may divert and recover 45 cfs of the 60 cfs at the Old Last Chance Ditch <br />diversion at Chatfield Reservoir. <br />10) Denver Conduit No. 20 and Platte Canyon Reservoir <br />The Denver Intake river diversion delivers water to Denver Conduit No. 20 and supplies Platte <br />Canyon Reservoir, Marston Reservoir, and the Marston Water Treatment Plant. Until 1985, it <br />also supplied the Kassler Treatment Plant, which was located at the mouth of Waterton Canyon. <br />Platte Canyon Reservoir is filled from the High Line Canal as well as from Conduit No. 20. Until <br />1983, with the completion of Strontia Springs Reservoir and Foothills Water Treatment Plant, <br />the Denver Intake was the major point of diversion of Denver Water's South Platte and Blue <br />River water supplies. <br />Diversions at the Denver Intake are made in response to Denver Water demands for raw water <br />supply at the Marston Water Treatment Plant. <br />11) Marston Reservoir and Marston Water Treatment Plant <br />Denver Water generally draws Marston Reservoir down in September and early October for <br />water quality purposes, and then refills the reservoir for winter. If high spring runoff is <br />anticipated, Marston Reservoir will be left empty to accommodate the potential increased runoff. <br />The Marston Water Treatment Plant is typically not used for municipal supply during the winter, <br />but is available as a back up facility for the Foothills Water Treatment Plant. <br />12) High Line Canal <br />Most of Denver's water rights that have been transferred to the Denver Intake may also be taken <br />at the High Line Canal. The High Line Canal is operated in the irrigation season, typically from <br />early/mid-April to early October. Approximately 200 cfs is diverted to "start' the canal after dry <br />periods. In general, diversion rates were historically between 90 to 150 cfs. Under more recent <br />operations the High Line Canal typically has diverted about 80 to 110 cfs when in priority, over <br />about 50 to 70 days per summer. <br />13) Chatfield Reservoir <br />An Apri13, 1979 agreement with the State of Colorado (CWCB and Division of Parks and <br />Outdoor Recreation) granted Denver Water the sole and exclusive right to regulate the 11,134 <br />ac-ft of storage between 5,423 feet msl (16,294 ac-ft) and 5,432 feet msl (27,428 ac-ft). In return, <br />Denver agreed to maintain the reservoir at 20,000 ac-ft as nearly as practicable between May 1 <br />and August 31. The effective operating pool with a minimum 20,000 ac-ft pool during this <br />period is 7,428 ac-ft. Because of variations in water supply, the goal of maintaining a minimum <br />Denver Water Board Operating Memorandum 38 of 40 <br />