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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />i <br /> <br />II <br /> <br />7 <br /> <br />The reason for this projection is urban water management optimization for <br />municipal water supply. There may be little or no release of South Platte <br />River water from Chatfield Reservoir for lengthy periods in dry years. <br /> <br />For the Denver municipal water system there are large diversion structures <br />on the South Platte River upstream from Chatfield Reservoir. These facili- <br />ties have the capacity to divert more water than they have historically. <br />The water diverted into the Denver municipal system travels through a <br />network of water distribution lines and sewage collection lines and returns <br />to the South Platte near Sand Creek below Denver as treated sewage efflu- <br />ent. This route bypasses the river channel between Denver's intake and the <br />Denver Metro Sewage Treatment Plant. <br /> <br />Downstream irrigation demands would be met with sewage effluent releases <br />from Denver Metro, with Clear Creek and Sand Creek natural flow, and with <br />other inflow from downstream tributaries. As the Denver municipal water <br />system and its service area grows the Denver Metro sewage effluent dis- <br />charges will increase. Ultimately, practically all of the South platte <br />flows upstream of Denver in a dry period could bypass the reach between <br />Chatfield and Sand Creek including the Columbine Valley area. <br /> <br />An estimate has been made of the probable low flow of the South platte <br />River during a dry year at about the Year 2000, assuming an extension of <br />the current water management practices. <br /> <br />The values in Table 7 below reflect the following assumptions: <br /> <br />o The gates in Chatfield Dam are completely closed. <br />o The Mission Viejo Sewage Treatment plant in Marcy Gulch is dis- <br />charging effluent to the South Platte a short distance below Chat- <br />field Dam at its ultimate projected capacity of 3 cfs. <br />