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Tunnel (and Dillon Reservoir) and to the Moffat Tunnel collection system. And the 1995 <br />Agreement between Denver, Englewood, and Cypress Climax Metals Company concerns <br />the allocation of the Englewood-Ranch Creek Collection System yield. <br />OPERATIONAL INFORMATION <br />Denver Water operates Moffat Water Tunnel year-round. During the wintertime, Denver Water <br />diverts as much as possible through the Moffat Water Tunnel. Use of water diverted through the <br />Tunnel is dependent upon the current need of water users in the Denver metro area and the <br />projected future needs of water users. <br />The general operating strategy of Denver Water is as follows. The first water rights typically <br />used to meet the demand of water users are direct flow water rights. Following use of direct <br />flow water rights, the next supply usually comes from exchanges using reusable water supplies. <br />The remaining water demand, if any, is normally supplied with storage releases from Strontia <br />Springs, Marston, or Ralston Reservoirs. Ralston Reservoir, located within the Moffat Water <br />Collection System, is primarily filled with water transferred from Gross Reservoir through the <br />South Boulder Diversion Conduit. Denver water tries to fill Ralston Reservoir by December 15 <br />and Gross Reservoir as soon as possible during the spring months. Based on this operating <br />strategy, water diverted through Moffat Water Tunnel, unless needed for direct use, would likely <br />be stored in Gross and Ralston Reservoirs until needed. <br />Flows through Moffat Water Tunnel are limited by <br />the 1,200 cfs capacity limit of South Boulder <br />Creek below the East Portal. During high spring <br />runoff, flows through the Tunnel are reduced to <br />allow for the natural flows into the South Boulder <br />Creek basin. <br />One exchange involving the Moffat Water Tunnel <br />commonly performed by Denver Water is the <br />Williams Fork Reservoir to Moffat Tunnel <br />exchange. This exchange is accomplished by <br />diverting water through Moffat Water Tunnel and <br />releasing a like amount of water from Williams <br />Fork Reservoir on the Western slope for use by <br />downstream senior water rights <br />June 10, 1936- First water from the Western Slope <br />through the Moffat Tunnel <br />Where to find more information <br />^ Specifics relating to the data collection and filling processes used in the determination of <br />the best source of data are presented in the SPDSS Task 4 Memorandum -Identify and <br />Fill/Resolve Conflicting Records for Key Transmountain Diversion Structures. <br />^ Additional information on ditch and reservoir operations within Water District 6 is <br />presented in the Water District 6 Meeting Notes prepared for SPDSS Task 3 -Identify <br />MoffatTunnel.doc 8 of 10 <br />