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",' Functional Specification for the Planning Model will be subject to user modification; default values of rules and targets will reflect historical operating patterns. . Both Taylor Park storage decrees will be explicitly represented in the model and will be allowed to fill in-priority, The start-fill dates of both storage rights will be November 1st in the Baseline. Each storage right will be assumed to fill a single account in the Baseline, referred to here as the senior and junior accounts. Due to the Taylor Park Exchange the sum of the two account balances may not equal the physical contents of Taylor Park Reservoir (e.g, some Uncompahgre water may physically reside in Blue Mesa) but this will not affect the condition that deliveries identified with an account are constrained by the amount of water in . the account. "Exchange credits," representing the amounts of the senior Taylor Park account and the Blue Mesa account which theoretically "reside" in one another's reservoirs, will be explicitly represented in the model. Releases from the senior account in Taylor Park will be made to Blue Mesa and accounted as credits therein under the Taylor Park Exchange. The schedule of these releases will be subject to user modification, Carryover storage at the end of the year will be computed . as total Exchange account contents, It will be possible for Blue Mesa credits to accumulate. and carryover in Taylor Park Reservoir, reflecting an equivalent negative balance of Taylor Park Exchange Credits in Blue Mesa Reservoir, although Blue Mesa water in Taylor Park will be evacuated as quickly as possible. . The junior refill decree in Taylor Park will fill in priority, Model capability to simulate out-of-priority fill selectively ahead of Blue Mesa will also be provided, This out-of-priority storage would be considered Blue Mesa water in Taylor Park until Blue Mesa achieves paper fill at which time it will be accounted as refill water, Releases under the refill decree will be made from the refill account up to the contents of the account, It is currently planned that any remaining water in the refill account at the end of the year will be booked over to the senior account and will count as fill toward that decree's limit in the following year, . Gunnison Tunnel and Project Canals Tunnel diversions to meet Uncompahgre Project irrigation demands will be determined by setting, at the beginning of a model run, the order in which potential sources of supply will be used. The potential sources are the following:. 1) Uncompahgre River direct flow available without UVWUA call, 2). Gunnison River direct flow available without UVWUA call, 3) Uncompahgre River direct flow available as a result of UVWUA call, 4) Gunnison River direct flow available as a result of UVWUA call, 5) storage water available in the Taylor Park Exchange account, and 6) storage water available in Ridgway Reservoir (M&I exchange water to be used first). In the Historical Scenario the order of these sources will be (1), (2), (5), (3), (6), (4). All tunnel diversions will be subject to the physical capacity limitations of the Gunnison Tunnel and the contents of the Taylor Park Exchange account. The Gunnison Tunnel junior hydropower decrees and AB lateral facilities will be "stubbed out" in the model to facilitate their representation in user-defined scenarios but will not be operated in either the Baseline or Historical scenarios, These conditional rights will be allowed to divert water in priority up to their decreed amounts or to the requested diversion for power production, whichever is less. The requested diversion will be according to a user- supplied schedule. . 10