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<br /> <br />. <br /> <br />S~tARY (Continued) <br /> <br />o <br />:.0 <br />:.0 <br />0.. <br /> <br />Lees Ferry <br />Hoover Dam <br />Imperial Dam <br /> <br />1980 <br />Zeror/A <br />0,87 <br />1.09 <br />1.28 <br /> <br />2T/A <br />0.88 <br />1.10 <br />1. 31 <br /> <br />1990 <br />ZeroT/A <br />0.97 <br />1.24 <br />1.50 <br /> <br />2T1A <br />1.03 <br />1.31 <br />1.61 <br /> <br />2000 <br />ZeroT/A <br />1.01 <br />1.30 <br />1.57 <br /> <br />2T/A <br />1.09 <br />1.39 <br />1.70 <br /> <br />Since the above figures (taken from Table 18) were computed by <br />using average 1941-1972 values, they show only average conditions. <br />Cnder actual operation of the river system. it should be realized <br />there will be years of higher flow, producing better quality water <br />or years of lower flow, producing poorer quality water. <br /> <br />The depletions used in this report for the projects. both author- <br />ized l'ld proposed for authorization to~ether with present developments <br />and other proposals are the depletions for the developments as pres- <br />ently conceived. The study also shows that by about 1990 storage re- <br />leases and/or augmentation from other sources ~ill be required to <br />supply all the demands. <br /> <br />. <br /> <br />This report also includes discussion of the effect of salinity on <br />.....ater uses and the potential for salini ty control measures. Investi- <br />gations of the potential for ~ater quality improvement on the Colorado <br />River were initiated by the Bureau of Reclamation in FY 1972. A re- <br />port entitled "Colorado River Water Quality Improvement Program" dated <br />February 1972 describes potential projects for controlling the salin- <br />ity of the Colorado River. A second report titled "Colorado River <br />Water Quality Improvement Program, Status Report," ~as published by <br />the Bureau of Reclamation in January 1974. This report, ~ith appro- <br />priate updating, is the basis of discussion of the status of the <br />Colorado River Salinity Control pro~ram presented in part IX of this <br />report. This evaluation of the program is made in accordance ~ith <br />requirements of the Colorado River Salinity Control Act, Public Law <br />93-320. <br /> <br />Other water quality aspects including sources of pollution, and <br />parameters such as dissolved oxygen, temperature, pH. heavy metals, <br />toxic materials. nutrients, bacteria. radioactivity, mercury, and <br />sediment are discussed. <br /> <br /> <br />. <br /> <br />2 <br />