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I I I I I I I I I I I I I I I I I I I '.' oOOZgg will evaluate the !!!Ipacts of a consolidated Three Forks Reservoir with 172,865 AF of " , storage. For this study, it will be assumed that all components of the project are in place at the beginning of the study period, The main project components to be modeled are shown on a general schematic diagram (See Figure 5, page 23). Table 5 summarizes the Three Forks Project input data to be used in the WIRSOS modeling. Of the total storage capacity, 10 percent (17,300 AF) will be assumed to be dead storage and the remaining 155,565 AF as active storage. An area-capacity curve for the consolidated Three Forks Reservoir has been developed by P&M and will be incorporated into the WIRSOS input. Project demands to be modeled will include storage water diversions for industrial uses by P&M. P&M holds no direct flow diversion rights under this project. It will be assumed that the industrial water is diverted directly from the reservoir area and 100 percent consumed with no return flows. Anticipated industrial demands upon the Three Forks storage water is unknown at this time. To quantify realistic industrial demands that the reservoir could meet on a year to year basis, WWC will perform a firm yield evaluation using the WIRSOS model. An initial constant industrial demand of 90,000 AF/year will be used in the firm yield investigation. In a previous study, WWC calculated a firm yield of about 90,000 AF/year (123 cfs) for a 160,000 AF reservoir (SWEC, November 1984). However, in that study no other projects, such as Pot Hook Reservoir, were operated simultaneously with the Three Forks Reservoir. Additional WIRSOS runs 31