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<br />I <br />I <br />. <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br />I <br /> <br />CHAPTER 2 <br /> <br />INTRODUCTION <br /> <br />2.1 PROJECT BACKGROUND <br /> <br />Under the pressure of rapid growth during the 1970's, the City of Grand <br />Junction along with its neighboring towns, communities and special districts <br />were faced with enormous capital improvement expeditures in order to adequately <br />provide services to all its residents both now and in the foreseeable future. <br />While concentrating efforts and finances towards completion of the badly needed <br />Persigo Wastewater Treatment Plant, the City's excess raw water supply <br />capability was also rapidly diminishing. Of primary concern in this regard is <br />the maximum utilization of water rights with respect to capturing, storing and <br />delivering raw water to the filter plant for treatment. <br /> <br />Under normal circumstances, 100 percent of the City's raw water comes from the <br />Kannah Creek watershed. Thi s water is conveyed to the fi lter plant vi a twi n <br />flow lines, each with a capacity of 6.5 MGO according the City records. Ouring <br />the drought of 1976 and 1977, however, the raw water supply system was unable <br />to deliver water to the filter plant in sufficient quantity to keep up with hot <br />summer day peak demands. This condition was largely due to the following two <br />factors: <br /> <br />1. Limited capacity for capturing spring runoff. <br /> <br />2. Limited transmission line capacity. <br /> <br />2-1 <br />