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095'2 Water and Storage Needs Assessment SECWCDI Assessment Enterprise December 10, 1998 represent the bulk of this potential water supply need. The supply/demand comparisons have assumed that the Fry-Ark Project yield is 80,400 af per year. Historical yield has been closer to 60,000 af per year. As municipal demand increases, municipal entities will begin using greater amounts of Fry-Ark Project water. Under the forecast, municipal entities will begin to use their Fry-Ark supplies more heavily, approaching their 51 percent allocation by the year 2020. This will impact current uses of Project water by agricultural users for supplemental irrigation and replacement supplies for well depletions. Forecast Deficit (Acre-Feet) High Forecast :i~' Region Year: Current 2010. ..2020 2030 2040- Entities West of Pueblo 0 0 0 400 2,100 Pueblo West 0 0 0 0 0 Pueblo 0 0 0 0 0 Fountain Valley 0 500 24.800 50,400 79,700 Entities East of Puebio 0 0 0 0 0 Total (High): 0 500 24,800 50,800 81,800 A water supply/demand comparison was performed for each municipal entity as described in Section 6 of the main report. The above tabulation summarizes results for the high demand forecast. 5. Most of the municipal water supply entities have water rights to meet their 2040 needs. However, storage capacity is needed to provide firm yield and to facilitate water exchanges and management of imported water reuse. 6. Average annual agricultural water use in the District is estimated to be 825,000 af (for ditches and canals between Pueblo and John Martin reservoirs). Agriculture relies heavily on supplemental sources including transmountain water, Fry-Ark water, Winter Water, storage reservoirs, and ground water, as indicated on Figure ES-4. (Direct flow water accounts of86 percent of agricultural use in a "wet" year, but only 65 percent in a "dry" year). As municipal demands increase, the amount of Project water now available to agricultural entities will decline, as indicated in Figure ES-S. Also, agricultural well users will need sources of replacement water to offset well pumping effects on the Arkansas River. A third supply source that may not be available to agricultural interests during the planning horizon is transmountain water currently being purchased by the irrigation companies from municipal entities. As municipal water use increases, this water, estimated to be 97411\FinaU\TEXT-AWPD -iii- ~ GEl Consultants, Inc.