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<br />. <br /> <br />w <br />"""" <br />w <br />-.,.J <br /> <br />. <br /> <br />. <br /> <br />Water quality and streamflow data are being obtained on a daily, <br />weekly, monthly, or quarterly basis at various points on streams throughout <br />the Basin by the USGS in cooperation with the states and other federal <br /> <br />agencies. Gaging stations in the Basin that are of significance to this <br /> <br />report and for which streamflow and water quality records are available are <br />listed on Figure 1. This figure shows the availability of streamflow and <br />water quality data for key stations during the period 1941-1980 and the <br />current frequency of sampling as classified by the USGS. Where the water <br />quality information is not complete, the missing data have been estimated by <br />correlation with data from other stations. <br /> <br />Salinity: 1972-1980 <br /> <br />The flow-weighted annual average salinity at the stations for which <br /> <br />numeric criteria have been set are shown in the following table: <br /> <br />Flow-weighted annual* average salinity <br />(Total dissolved solids in milligrams per liter) <br /> <br /> 1972 <br />St at ion ( Numeric 1973 1974 1975 1976 1977 1978 1979** 1980** <br /> criteri a) <br />Hoover Dam 723 706 686 689 675 667 686 694 707 <br />Parker Dam 747 726 700 703 689 681 681 703 703 <br />Imperial Dam 879 846 836 829 823 821 812 809*** 755*** <br /> <br />* Calendar year. <br />** Provisional, subject to change. <br />*** The low salinity concentration is due to surplus flows which occurred <br />in 1979 and 1980. <br /> <br />Projections of Future Water Use <br />One of the significant factors affecting salinity concentrations is <br />water use. The depletion of Colorado River water by the Upper Basin States <br />in 1979 was estimated at 3,362,000 acre-feet exclusive of Colorado River <br /> <br />7 <br /> <br />'iL;:;.~ <br />