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<br />BASIC FIXED SITE WATER-QUALITY SAMPLING <br /> <br />At each basic fixed site, monthly and three extreme (low and <br />high flow) water-quality samples are collected each year. Following <br />are the measurements and analyses performed for each sample: <br /> <br />Field measurements: <br />Dissolved oxygen, pH, alkalinity, specific conductance, <br />water temperature, and discharge <br /> <br />Laboratory analyses for concentrations of: <br />Suspended sediment <br /> <br />Major constituents: <br />Dissolved solids, calcium, chloride, fluoride, iron, manganese, <br />potassium, silica, sodium, and sulfate <br /> <br />Nutrients: <br />Total and total dissolved nitrogen, ammonia, nitrite, nitrate, total and <br />total dissolved phosphorus, and orthophosphate <br /> <br />Other: <br />Dissolved and suspended organic carbon <br /> <br /> <br />~ <br />~ <br />I <br /> <br />I=., <br />I "" <br /> <br />~ <br /> <br />~ <br /> <br /> <br />" <br /> <br />-... <br /> <br />Photograph by Randy Parker <br /> <br />Upper Colorado River study unit basic-fixed-site network-continued <br /> <br /> Mean daily flow duration statistics 1 <br />11o-percent 50-percent gO-percent <br />exceedance exceedance exceedance Based on <br />. water years <br />I (Cubic feet per second) <br /> 14,400 4,420 2,600 1970-95 <br /> 9,310 2,320 1,530 1970-95 <br /> 5,000 1,330 810 1970-95 <br /> 4,970 2,120 890 1970-95 <br /> 2,510 1,020 280 1970-95 <br /> <br />I New gaging station, no historic streamflow information <br /> <br />1,080 <br /> <br />105 <br /> <br />56 <br /> <br />1970-72, <br />80-81,94-95 <br /> <br />New gaging station, no historic streamflow information <br /> <br />454 <br /> <br />80 <br /> <br />43 <br /> <br />1970-95 <br /> <br />New gaging station, no historic streamflow information <br /> <br />89 <br /> <br />56 <br /> <br />3.8 <br /> <br />1970-95 <br /> <br />New gaging station, no historic streamflow information <br /> <br />New gaging station, no historic streamflow information <br /> <br />205 <br /> <br />18 <br /> <br />6.6 <br /> <br />1970-95 <br /> <br />I Daily average flows that are exceeded 10, 50, and 90 percent of the time. <br /> <br />Historic <br />water-quality <br />data <br /> <br />Primary reason for site <br /> <br />Yes <br /> <br />Outlet of the study unit <br /> <br />Yes <br /> <br />Main-stem site upstream from the Grand Valley <br />agricultural area <br /> <br />Limited <br /> <br />Main-stem site near physiographic province boundary <br /> <br />Yes <br /> <br />Near mouth of largest tributary in study unit <br /> <br />No <br /> <br />Downstream from major reservoir system. <br />Baseline site for the lower Gunnison River Basin <br /> <br />No <br /> <br />Upstream from major reservoir system. <br />Integrator of the upper Gunnison River Basin <br /> <br />Limited <br /> <br />Downstream from area of rapid urbanization <br /> <br />No <br /> <br />Downstream from area of rapid urbanization <br /> <br />No <br /> <br />Downstream from area of metal mining <br /> <br />No <br /> <br />Downstream from area of metal mining <br /> <br />Limited <br /> <br />Downstream from agricultural area <br /> <br />Limited <br /> <br />Downstream from agricultural area <br /> <br />No <br /> <br />Reference site for Colorado Plateau <br /> <br />No <br /> <br />Reference site for southern Rocky Mountains <br />