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<br />. <br /> <br />SPECIAL STUDIES (Continued) <br /> <br />o <br />to in Flaming Gorge Reservoir because of the relatively low level of <br />~ nutrient loading and the large storage capacity of the reservoir. Tbis, <br />0) coupled witb the reservoir's relatively high flow-through capacity, <br />discourages the accUlDulation and concentration of nutrients. However, <br />if nutrient loading should increase significantly due to changes in <br />conditions upstream, algal blooms could greatly increase, especially <br />during droughts when inflow is low. This could result in a degraded <br />water quality severely limiting tbe reservoir's value for recreational <br />use. <br /> <br />C. Lake Powell <br /> <br />. <br /> <br />A network of six sampling stations was established in Lake Powell <br />in 1965 and sampling at these sites had continued on a quarterly basis <br />until the fall of 1971. In addition, samples were taken at the mouth of <br />Wahweap Creek and below the Glen Canyon Dam on a monthly basis. The <br />purpose of this program was to observe chemical changes in the reservoir <br />with time. In the fall of 1971 the quarterly sampling program was in- <br />creased to a monthly program to obtain sufficient data for a mathe- <br />matical model of the Colorado River system. The seven sites in the <br />reservoir are: (1) Wahweap, (2) Crossing of the Fathers, (3) Oak Creek, <br />(4) Cha Canyon, (5) Escalante River, (6) Bullfrog, and (7) Hite Basin. <br />The samples are taken at 50-foot (15 m) intervals to the bottom of the <br />lake and analyzed for dissolved solids, common ions, specific con- <br />ductance, pH, temperature, and dissolved oxygen. Figure 8 shows the <br />change in salinity concentration with depth for the period of record at <br />the Wahweap station. I t appears that the concentration had stabilized <br />since about 1972 but had risen with the drought of 1977. The impact of <br />this rise might be felt in about two years at Imperial Dam. <br /> <br />From 1971 to March 1978 a research project entitled "Lake Powell <br />Research Project" was conducted by a consortium of university groups <br />funded by the Division of Advanced Environmental Research and Technology <br />and RANN (Research Applied to National Needs) in the National Science <br />Foundation. The researchers in the consortium sought to bring a wide <br />range of expertise in natural and social sciences to bear on the general <br />problems of the effects and ramifications of water resource management <br />in the Lake Powell region. Their findings are presented in a series of <br />project bulletins. The titles of those bulletins related to water <br />quality and water quantity topics are shown as References 8 to 18 in the <br />Bibliography. <br /> <br />D. Lake Mead <br /> <br />The Bureau of Reclamation conducted an extensive sampling program <br />of Lake Head from 1964 through 1968. The data collected from the <br />sampling program were published by the Bureau of Reclamation in Report <br />No. CHE-70, Water Quality Study of Lake Mead, 1970. <br /> <br />. <br /> <br />117 <br />