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. . . ~ ~ .::.. ~;) l' SPEC1AL STUDIES (continued) for the reach from Lake Powell to Imperial Dam instead of including all the Upper Basin stations as well as the Lower Basin stations. Results were comparable to the Biennial Report study. This was the model used by the work group for the Colorado River Basin Salinity Control Forum to make pro- jection studies in developing numeric criteria and a plan of implementation of control measures to meet the criteria. 3. Colorado River Simulation System (CRSS) This comprehensive mathematical model of the Colorado River was developed so it could be adapted to other basins as well as the Colorado River Basin, simulating both water qLlality and quantity. The model was first applied to the West Wide studies using a stochastic hydrologic data base. A natural flow data base is presently being developed for both water quality and quantity. It is based on recorded data adjusted for known changes in the hydrologic regime such as consumptive use for in-basin agriculture, reservoir changes of content, evaporation, bank storage, municipal and industrial uses, and transbasin diversions. Periods of missing records have been filled Ln by statistical correlations. The most recent application of the CRSS and the natural flow data base has been for this report. This model will be used to forecast the effects on water quantity and quality with future changes in project developments. We anticipate that this method ...ill replace the currently used present modified method for all future progress reports. However, in this report both methods are being presented for comparison purposes. Based upon past comparison, we feel the CRSS will be a much better predictive tool for estimating salinity and has the advantage of a better data base, a more complete description of the basin and a much greater degree of flexibility. Additionally CRSS will use monthly virgin flows over the entire historical period and monthly reservoir operations. CRSS operates the reservoirs according to their regular operating schedules. The salinity projections from the CRSS study are presented at the end of this section in Table F and Table G. Specifically, a more detailed descriptive summary of the CRSS follows below. a. GENERAL The CRSS is a deterministic model that was developed by the Water and Power Resources Service to simulate the operation of the Colorado River. With eRSS, proposed changes to the operation of the river can be modeled, and their effect on the future quantity and quality of the water in the river may be evaluated. CRSS is made up of four major components: 106