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~G":~J Report of the Regional Director . Engineers for conservation storage and flood control. It also has an irrigation storage space of 420,000 acre-feet. The three headwaters reservoirs have a capacity of 84,400 acre-feet. The 11 off stream reservoirs have a present ca- pacity of 300,000 acre-feet which represents about 7S per- cent of the original capacity' as a consequence of sedimen- tation. Eight privately-owned transmountain diversion sys- tems import about 48,000 acre-feet annually. 20. More than 40 canals and ditches supply irrigation water to lands in the valley between Canon City and the Colorado-Kansas boundary. Sediment deposition in canals and ditches has become a major irrigation problem in the Pueblo-Las Animas reach. In SOIre instances long reservoir feeder canals have lost SO percent of their capacity be- cause of sedimentationo . 21. The amount of irrigation water available for the 322,000 acres of irrigated land in the project area varies considerably from year to year. Seldom is the supply ade- quate for maximum crop production. Irri~ation water short- ages as high as 78 percent of crop requirements have oc- curred. The estimated average canal headgate cuversion re- quirement is 3.19 acre-feet an acre. Allowing for toleratiLe shortages, that headgate requirement can be reduced to 3.10 acre-feet. The average amount of seasonal irrigation water historically available between Pueblo and the Kansas State line has ranged from 0.9 acre-feet an acre in 1934 to 2.7 acre-feet in 1942. The base flow of every stream in the valley is over-appropriated. Enhancement of the irrigation water supply depends upon regulation of existing supplies for more efficient use, additional storage capacity for the conservation of excess flood flows, reservoir space for holdover storage, and new water supplies for which the only apparent source is transmountain diversion from the Colorado River drainage. ~ 22. Power facilities of the Initial Development will be designed for integration with the power facilities of the Bureau I s Colorado-Big Thompson Project and with local utili ties to serve a combined power market area. The . R 8 1 .