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I I I I I I I I I ,I I I I I I I I I I estimated to be 3000 acre-feet. The estimated total return flow from agricultural, municipal, and domestic supplies was 7500 acre-feet annually. Minimum Streamflows The operation studies were conducted under the assumption that minimum streamflow bypasses would be required on certain stream reaches in order to obtain federal permits for project construction. There are two stream reaches which may be involved in such a requirement. The first reach would include the North Fork of the White River from the point of diversion downstream to the confluence with the South Fork. The second reach would begin at the confluence of the North and South Forks and continue downstream to Piceance Creek. The assumed minimum flows are 120 cfs and 200 cfs, respectively. If natural flows are less than these values, the natural flows will govern. It was also assumed that there would be some flexibility in meeting these minimum flows, especially during a below average runoff year. Simulation Criteria' Operation studies were made of the originally decreed Yellow Jacket water rights using the direct flow diversion on the North Fork as well as storage at Lost Park and Ripple Reservoirs. Those studies established the base condition, or the amount and timing of storage which could be accomplished under the present YJWCD water rights. Operation studies for the three alternative plans were carried out using the constraints identified in the base condition. Base Condition The base condition was quantified through the use of an accounting system that traces monthly volumes as they are either diverted, bypassed, stored, or released. The following steps outline the general sequence utilized in conducting the simulation. The description of the steps also indicates the criteria or assumptions used. Reference is made to Figure V-I for the locations of the YJWCD water rights within the basin and in relation to other water right holders. V-7