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<br />"., <br />~ <br />"'-J <br /><;y ..here: C = the <br /> S = the <br /> Q = the <br /> A = the <br /> <br />C= <br /> <br />S <br />AQ <br /> <br />(2) <br /> <br />equivalent dissolved-solids concentration, in mg/L; <br />adjusted salt load, in tons per year; <br />adjusted discharge, in cubic feet per second; and <br />conversion factor. <br /> <br />Calculations of the salt-load contributions to streams by major springs <br />..ere made by directly measuring the spring discharges and indirectly by <br />evaluating the chemical quality of the ..ater. In June 1979, data ..ere <br />collected for 14 mineral springs (see table 12, Supplemental Information at <br />back of report). In some places (Glen..ood Springs, Colo., Dotsero, Colo., and <br />Steamboat Springs, Colo.) the springs flo.. directly into the stream channel <br />and direct measurement of the disc~arge is not possible. In these situations, <br />measurements of the salinity of the river upstream and downstream from the <br />springs, the salinity of the spring itself, and a measurement of the discharge <br />of the river were used to compute the approximate spring discharge to the <br />river. It was assumed that the river discharge was much greater than the <br />spring discharge, and, therefore, the streamflow upstream and downstream from <br />the spring discharge was assumed constant. Using this assumption, the spring <br />discharge was approximated by the equation: <br /> <br />QrCrb-QrCra <br /> <br />Qs = <br /> <br />Cs <br /> <br />(3) <br /> <br />where: Qs = <br /> Qr = <br /> Crb = <br /> Cra = <br /> Cs = <br /> <br />spring discharge, in cubic feet per second; <br />river discharge, in cubic feet per second; <br />salinity of river downstream from the spring discharge, <br />in milligrams per liter; <br />salinity of river upstream from the spring discharge, <br />in milligrams per liter; and, <br />salinity of spring, in milligrams per liter. <br /> <br />GROUND-WATER SALINITY CONTRIBUTION <br /> <br />The study area was divided into two major regions: the region drained by <br />the Colorado River and tributaries upstream from the confluence with the Green <br />River and the region drained by the Green River and its tributaries. Each of <br />these two major regions was divided into subregions (fig. 1). These <br />subregions correspond closely with the subregions of the Upper Colorado River <br />Basin shown on the hydrologic unit maps of Colorado (U.S. Geological Survey, <br />1976), Wyoming (U.S. Geological Survey, 1977), and Utah (U.S. Geological <br />Survey, 1975). <br /> <br />15 <br />