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<br />I"'J <br />an <br />L"" <br /> <br />r,:.-, <br /> <br />-, <br />'....,.' <br />. <br /> <br />CHAPTER II <br /> <br />GRAND VALLEY RIVER BUDGET <br /> <br />The salt pickup in Grand Valley was determined by analyzing the salt <br /> <br />"budget" for the valley. <br /> <br />The valley is defined as the area South of the Government Highline <br /> <br />Canal, north of the Colorado River and the Orchard Mesa and Redlands Canals, <br /> <br />west of the Grand Valley Diversion Dam, and east of West Salt Creek (see <br /> <br />Frontispiece Map). The total acreage within this area is 123,100 acres. <br /> <br />The budget accounts for the salt inputs and outputs, ~ld then calculates <br /> <br />the difference, which is the salt pickup. Specifically, thl! inputs were <br /> <br />. represented by the Colorado River near Cameo, the Gunnison River near Grand <br /> <br />Junction, Plateau Creek near Cameo, inflows from ungaged lands, and municipal <br /> <br />inports. The output was the Colorado River near the Colorado-Utah State Line <br /> <br />(see Figure 1). Alternatively, the Colorado River output was estimated by <br /> <br />the Colorado River near Cisco, less the Dolores River ne..r Cisco, and less <br /> <br />ungaged inflows between the StatelinE! and cisco gages. Budgets using both <br /> <br />stations are presented in this report. Each of the budget components was <br /> <br />estimated and then refined in light of the water budget and its resultant <br /> <br />unaccounted flow. <br /> <br />Rivers <br /> <br />The salt loading in the rivers was calculated using USGS daily flow, <br /> <br />USGS daily specific conductance, USGS water quality samples, and USBR water <br /> <br />. <br /> <br />quality samples. The periods of record for the river stations are summarized <br /> <br />II-I <br />