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of 20,000 ac-ft during the summer "may not be continually attainable, and the amount in storage <br />maybe allowed to fluctuate" below 5,423 feet during "severe and prolonged drought conditions" <br />as determined by CWCB. Denver Water is responsible for replacing the evaporation losses from <br />the reservoir when the lake level is less than 5,432 feet msl. Denver was granted the first right of <br />exchange to Chatfield Reservoir. The dam's manifold has been decreed as an exchange point <br />and/or alternate point of diversion for numerous water rights. <br />Chatfield Reservoir is the lowest storage facility in Denver Water's raw water system. Denver <br />Water typically uses its Chatfield Reservoir storage to capture the required minimum flow <br />releases from Strontia Reservoir. These flows were imposed by the federal government for a <br />right-of--way that was required for Strontia Dam and the Foothills Water Treatment Plant. Denver <br />Water also uses its Chatfield Reservoir storage to exchange wastewater effluent. It usually <br />utilizes this exchange when water is available that cannot be captured at Denver Water's <br />upstream points of diversion. <br />Up unti12002, any of this water not exchanged would be considered "lost' when Chatfield <br />Reservoir spilled because of Denver Water's physical inability to take and use water stored in <br />Chatfield Reservoir. In 2002, Denver Water created the following two new connections by which <br />they could take the "lost' water. <br />• Water stored in Platte Canyon Reservoir is pumped back to Last Chance Pipeline. This <br />approach is used to regulate flow through Denver Conduit No. 20. <br />• Chatfield Pipeline, controlled by the Chatfield pumps (unknown WDID) diverts water <br />directly from Chatfield Reservoir to Denver Conduit No 20. Typically, 10 to 20 cfs is <br />pumped through the 30 cfs maximum Chatfield Pipeline. <br />• Denver Water anticipates bringing on-line a third system that will divert water directly from <br />Chatfield Reservoir to Denver Conduit No. 20. <br />Reusable Supplies <br />Denver Water has reusable return flows available at the Littleton-Englewood WWTP and Metro <br />WWTP from its use of transbasin Roberts Tunnel and Englewood-Ranch Creek Moffat Tunnel <br />deliveries. These reusable supplies are typically diverted by exchange at upstream points of <br />diversion and storage after diversion of Denver Water's native South Platte River water supplies <br />to meets its potable demand. Additional demands on the use of the reusable supplies include the <br />recent non-potable deliveries from Denver Water's Metro reuse plant, as discussed above. <br />Where to find more information <br />^ Procedures for determining key diversion structures and a list of all key diversion structures <br />selected is presented in SPDSS Task 3 -Identify Key Diversion Structures Overall Task <br />Memorandum. <br />^ Procedures for determining key reservoirs and reservoir systems and a list of all key <br />reservoirs and reservoir systems structures selected is presented in SPDSS Task 5 - <br />Identify Key Storage Elements Overall Task Memorandum. <br />^ Additional information on ditch and reservoir operations within the Water Districts is <br />presented in the SPDSS Task 3 -Meeting Notes for Water Districts 2, 8, 9, 23, and 80. <br />Denver Water Board Operating Memorandum 39 of 40 <br />