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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 />II <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3-4 <br /> <br />Historical Water Use <br /> <br />Annual treated water consumption for the past ten years for <br />Cortez is given in Table 3-4. Included in this table are the Census <br />population figures and the associated per capita treated water <br />usage. In 1983, a sharp reduction occurred in the annual water <br />consumption and in the per capita consumption. This reduction was in <br />excess of 15 percent of total consumption and was the result of <br />replacement of 6.8 miles of leaking transmission line in the fall of <br />1982. Following replacement of this leaking pipe, the measured unit <br />consumption fell to approximately 240 gallons per capita per day <br />(gcd), throughout 1983 and 1984. It is not exepected that any <br />further such savings in unit demands will be achieved through <br />additional line replacements. <br /> <br />Seasonal Considerations <br /> <br />Seasonal water demands changes experienced at the CQrtez Water <br />Treatment plant are shown on Figure 3-3. The high water use months <br />are Hay through october with peak usage occurring in the summer <br />months of June, July, and August. Summer month peaks are attributed <br />to high lawn and park irrigation. The peak day to annual average'day <br />demand data is illustrated in Table 3-5 for the last six years. This <br />data shows a remarkably consistent ratio between the peak day to <br />annual average day demands. the average ratio over this period is <br />close to 2.75. <br /> <br />Comparison Study <br /> <br />11 comparison study viaS performed to get a feeling for the per <br />capita usage for towns with similar characteristics. The findings of <br />this study are summarized in Table 3-6. <br /> <br />Water Demand Criteria <br /> <br />The water demand criteria established for this study is given in <br />Table 3-7. For the purpose of system planning, 240 gcd for raw water <br />has been taken as an adequate supply figure to meet dry year <br />demand. Adding an allowance of 20 gcd for raw water transmission <br />losses, reservoir evaporation and seepage losses, and water treatment <br />plant losses from the 240 gcd, an annual average raw water supply of <br />260 gcd is established. This is somewhat lower than the per capita <br />use experienced in previous years, but is very close to that <br />experienced or anticipated by many other Colorado cities. Per capita <br />use will fluctuate from year to year being dependent on many factors <br />but 260 gcd is bel ieved to be the maximum that will be observed in <br />the future. <br /> <br />BROWN AND CALDWELL ~ <br /> <br />CONSULTING ENGINEERS <br />