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<br />. <br /> <br />. <br /> <br />. <br /> <br />SPECIAL STUDIES (Continued) <br /> <br />o <br />w <br />~ <br />w <br /> <br />2. <br /> <br />^ <br />Interim Water Quality Simulation Model for the Colorado River <br /> <br />This model was developed by the Bureau of Reclamation in 1973, and <br />nominally duplicated the hand computed model shown in Table 18 of the <br />January 1973 "Quality of Water Colorado River Basin Progress Report" No. <br />6, as it included the 1941-70 period of record. The model ("Application <br />of a River Network Model to Water Quality Investigations for the Colo- <br />rado River," September 1973 by R.W. Ribbens and R.F. Wilson) however. <br />was different in that it simulated reservoir operations, was computed on <br />a monthly, year by year instead of an average annua 1 basis and was <br />developed for the reach from Lake Powell to Imperial Dam instead of <br />including all the Upper Basin stations as well as the Lower Basin sta- <br />tions. Results were comparable to the Biennial Report study. This was <br />the model used by the work group for the "Colorado River Basin Salinity <br />Control Forum" to make projection studies in developing numeric criteria <br />and a plan of implementation of control measures to meet the criteria. <br /> <br />3. Colorado River Simulation Model (CRSM) <br /> <br />This comprehensive mathematical model of the Colorado River was <br />developed by the Bureau of Reclamation during the years 1972 to 1974. <br />It was developed so it could be adapted to other basins as well as the <br />Colorado River Basin, simulating both water quality and quantity. The <br />model was first applied to the West Wide studies using a stochastic <br />hydrologic data base. <br /> <br />A natural flow data base has recently been developed for both water <br />quality and quantity. It is based on recorded data adjusted for known <br />changes in the hydrologic regime such as consumptive use for in-basin <br />agriculture, reservoir changes of content, evaporation, bank storage, <br />municipal and industrial uses, and transbasin diversions. Periods of <br />missing records have been filled in by statistical correlations. <br /> <br />The most recent application of CRSM and the natural flow data base <br />to the Colorado River Emerging Energy Technology (CREET) study done in <br />1978 for the State of Colorado in cooperation with the Water Resources <br />Council. The CREET study is a summary of 23 hydrologic traces applied <br />to high, medium, and low demand schedules for with emerging energy <br />requirements. This study is, perhaps, the most rigorous basin-wide <br />water quantity and quality examination of reservoir and stream condi- <br />tions performed on the Colorado River Basin. It is expected the model <br />will be used to obtain results for this report in the future. <br /> <br />124 <br />