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HydroBase Data <br />The data available in HydroBase for the 1950 to present period pertaining to High Line Canal <br />include the following: <br />Total River Diversions <br />• Complete record 1950 to present (see Figure 15) <br />• Historical diversions average about 22,500 ac-ft/yr over the 1950 to present period <br />• Annual deliveries typically occur during the irrigation season <br />• No water was diverted through the High Line Canal during 2002 due to concerns of <br />excessive ditch losses <br />Figure 15 <br />Highline Canal Monthly Diversions <br />20,000 <br />,~-, 16,000 <br />w <br />0 <br />12,000 <br />A <br />~ 8,000 <br />0 <br />4,000 <br />0 <br />O M lp Ol N V7 00 ~ l~ O M ~O Ol N V7 00 ~ <br />V7 V7 V7 V7 lp lp lp l l l 00 00 00 00 01 01 01 O O <br />ti ti ti ti ti ti ti ti ~ ~ ~ ti ~ ti ti ti ti ti ti <br />13) Chatfield Reservoir (Structure ID 0803514) <br />Chatfield Reservoir is located on the South Platte River approximately two miles south of <br />Denver. The reservoir was built for flood control and conservation by the Army Corps of <br />Engineers (COE) after the 1965 flood. Chatfield Dam was completed in 1973. The reservoir <br />started regulating South Platte River flows in June 1979, according to the COE. In a March 1, <br />1979 agreement between the United States and the State of Colorado (CWCB and DWR), the <br />state agreed to maintain water within a conservation pool in Chatfield Reservoir. This reservoir <br />pool level was designated between elevation 5,423 and 5,432 feet msl (see Table 8 below). It <br />was dedicated in the interest of recreation and fish and wildlife functions "except during periods <br />Denver Water Board Operating Memorandum 26 of 40 <br />