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1 1 i. Below Shoshone: Elk Creek Reservoir j. Below Shoshone: Colony's Middle Fork Reservoir k. Below Shoshone: Dry Hollow Reservoir 1. Below Shoshone: Kendig Reservoir in. Below Shoshone: Main Stem Reservoir n. Below Shoshone: Parachute Creek Reservoir o. Below Shoshone: Starkey Gulch Reservoir 5. Power Plant Operations and Scheduling a. East Slope Power Operations and Scheduling b. Shoshone Power Plant c. Grand Valley Power Plant 6. Other Alternatives a. Insurance Pool Reservoir and/or Operations b. Obtain Historic Irrigation Consumptive Use Credits These alternatives are discussed in detail below and summarized in Table 1 at the end of this report. 3.2 EXPANDED COORDINATED RESERVOIR OPERATIONS Coordinated Reservoir Operations presently consist of the voluntary bypass of reservoir inflows during the 7 to 10 day spring peak. Expanded Coordinated Reservoir Operations will attempt to increase peak enhancement opportunities by removing some of the constraints that limit existing Coordinated Reservoir Operations To increase spring hydrograph peaks beyond those achieved by the existing Coordinated Reservoir Operations will require analysis and resolution of the issues identified by the CROP group. The major issues are identified below. • Flood Liability. Releases will not be made to supply additional water on the spring peak in those years when the expected spring peak will exceed 26,600 cfs. This constraint on releases will help insure that augmentation of spring peaks under this program will not increase the magnitude of spring flooding. Augmenting spring peaks will, however, increase the frequency and perhaps the duration of high water during the spring runoff period. The legal liability for flooding resulting from peak enhancement releases from participating facilities needs to be addressed. Participating reservoir owners and I operators must know the real liability implications of operating their facilities for peak p:\data\gW0cwcb\J8133\report\phase-J\chap-3.doc 3-3