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1 t 1 1 Table ES-6 Potential Water Sources Source Amount Cost (acre-feet) ($/acre foot) Bonneville Unit Fishery Flows 20,000-25,000 0 Daniels Creek Diversions 2,900 0 Land Purchase and Fallow ? Market Value Conservation Projects Delivery ? $1,000-1,500 On-Farm Conservation Projects ? $1,000-1,500 Purchase of Existing Water Rights Storage ? Market Value Study Results and Conclusions • The long-term average flow (1912-1990) in the Duchesne River at Randlett has averaged 498,000 acre-feet. • The USBR's pre-development theoretical flows show the virgin flows of the Duchesne River for the same period (1912-1990) averaging 768,000 acre-feet. • Long-term depletions on the Duchesne River at Randlett, calculated using the USBR's pre-development flows, have been 270,000 acre-feet. • Since 1970, depletions have increased on the Duchesne River, with average depletions at 342,000 acre-feet. • Over the life of the project, the Bonneville Unit will, on average, annually deplete 143,200 acre-feet from the Duchesne River system. • The UBRP Project is anticipating additional depletions to the Duchesne River system of 25,300 acre-feet per year. ' The USFWS preliminary flow recommendations for wet, average, and dry years in total will require 555,000; 338,000; and 184,000 acre-feet of water on a yearly basis at the Duchesne River Randlett gauge. ' • The USFWS preliminary flow recommendations are based solely on hydrology with no biological data to determine the actual needs of the fish. • During dry years, including the recent period of 1989-1994, the USFWS preliminary recommended flows, if met at Randlett, would require up to 134,000 acre-feet of water to be acquired in the system. • There are a number of potential sources of water in the Duchesne River Basin, however, most would require the purchase of water rights either directly or through land fallowing. • Water from the various sources, if purchased, would be at a cost of $1,000 to $1,500 per acre-foot or market value, if the water is available for purchase. SLC~13410TREPTI.DOC ES - 7