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. Oeliverables: I. STATE: Summary ofM&I consumptive uses modeled in Phase II. 2. STATE: Summary of M&I consumptive uses for Yampa River Basin from Consumptive use report 3. STATE: Summary of aggregated M&I to be modeled in Phase IlIa. 4, STATE: Location of not more than four nodes to represent Phase IIIa M&I demands, 5, STATE: Briefing to Boyle of aggregation process, 6, STATE: Aggregated M&I demand files and paranleters, 7. STATE: Task Memorandum 3.10 describing the results of this Task. Task 3.11 Aggregate Reservoirs and Stock Ponds Objective: Aggregate reservoirs and stock ponds not explicitly modeled in Phase II to allow simulation of minor reservoirs and stock pond consumptive use in the basin. Assumptions: TIle basis for aggregating reservoirs not modeled in Phase II is the OMI watright and the CROSS database of water rights. TIle basis for aggregating stock pond consumptive use is the consumptive use report . Approach: 1. STATE: IdentifY reservoIrs modeled explicitly in Phase II and sum their decreed storage capacity. Using the DMI watright with the -aggres option, determine the total absolute decreed storage in the basin. Calculate the amount of storage to be represented by aggregated reservoirs as the difference between these two values, 2, STATE: Using the consumptive use report, identify the capacity of stock ponds, 3 ' STATE: Assign the aggregated reservoirs to no more than 4 locations in the basin using engineering judgment Assign the aggregated stock ponds to no more than 4 locations in the basin using engineering judgment F or budgeting purposes, assume aggregated reservoirs and stock ponds will be distributed evenly to no more than 4 locations each (4 aggregated reservoirs and 4 aggregated stock ponds), 4. STATE: At a regularly scheduled progress meeting, brief Boyle team on spatial aggregation of the aggregated reservoirs and stock ponds, IncOlporate input as appropriate, before completing task, 5. STATE: Based on engineering judgment, generate a simple two point area-capacity curve and identifY an existing Phase II evaporation station to model evaporation at the aggregated reservoirs and stock ponds. 6. STATE: Develop the StateMod operating right (*.opr) and reservoir target file (*,tar) file to release from the aggregated reservoirs such that 25% of the account volume is released in July, 50% during August, and 25% during September. Set stock pond targets (* ,tar) to fulL This may include using the time series utility, tstool. 7, STATE: For baseflow purposes, estimate aggregated reservoir and stock pond end-of-month contents (* .eom) to equal target contents. '8, STATE: Review the model network file (*.net) resulting from the OM! makenet in task 3,04 to reflect the aggregated reservoirs and stock ponds. Phase IlIa Scope of Services A-31 1153 Jan 31, 1997