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<br />.... <br />C,1l <br />w::.. <br />,:;:~ <br />. .:<j,) --.I <br /> <br />CHAPTER rr <br /> <br />GRAND VALLEY RIVER BUDGET <br /> <br />The sait 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 Diveraion Dam, and east of West Salt Creek (see <br /> <br />Frontispiece Map). The total acreage within this ares is 123,100 acres. <br /> <br />The budget accounts for the aalt input. and outputs, and then calculates <br /> <br />the difference, which is the salt pickup. Specifically, the inputs were <br /> <br />. .<oi;,~.' ." <br />~;; repreaented by the Colorado River near Cameo, the Gunnison River near Grand <br /> <br />Junction, Plateau Creek near Cameo, inflows from ungaged landa, 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 near 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 />quality samples. The periOds of record for the river stations are summarized <br /> <br />rI-I <br />