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3. Minimum Content Capacity - This table gives the minimum allowable content in the reservoir each month. If omitted, HYDROSS uses the first (smallest) value in the Reservoir Contents Table (see above). HYDROSS will not release water below this level for any reason; the only losses will be seepage (see below) and evaporation. 4. Target Content Capacity - This table gives the desired content in the reservoir each month. If omitted, HYDROSS uses the maximum content (see above). The target content is used for pool maintenance and for determining diversion demands for off-stream storage. 5. Evaporation - This is a monthly table of (linear) values which give the depth of evaporation per unit of surface area. Multiply by the surface area to get the water volume lost to evaporation in a month. If omitted, evaporation will be zero. Operational Framework Taylor Park Reservoir (Taylor) is located on the Taylor River which is a major tributary to the Gunnison River. Taylor was originally constructed by the Bureau to supply water to the Uncompahgre Valley via the Gunnison Tunnel. The reservoir is operated with a 1941 storage decree with a once a year fill right of 106,200 acre-feet. Water is stored in Taylor and releases are made to satisfy the irrigation demand at the Gunnison Tunnel based upon a 1913 water right. Subsequent to the construction of the Unit a complex exchange arrangement between Taylor and Blue Mesa was established to balance storage in both reservoirs. To simpli- fy this arrangement HYDROSS uses a monthly release targets for Taylor based upon data which was provided by the Bureau. Taylor parameter tables and release targets are displayed in Table 2. Below Taylor, a station is added to the network to-model the releases from Taylor. These releases are controlled by an Instream Flow Requirement (IFR) table which contain the Taylor release target. The IFR causes Taylor to release water which is needed down stream. The next station is place in the network to account for virgin flows produced from the upper reaches of the Gunnison River. This station corresponds to a CRSS inflow entitled "Flow Gains above Blue Mesa on the Gunnison River". The station is also used to model several diversions which occurred above Blue Mesa that were identified in the Nature Conservancy study entitled "Curicanti Minimum Stream Flow Water Rights" August 1986. The study identifies three uses which occurred above above Blue Mesa and have water rights superior to most other rights on the river. These uses include agricultural, municipal, industrial, and 5