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Show I f . -",-.' -•""•' I A P P E N D I X Bonneville Unit, Central Utah Project Analyses of Two Major Issues j 1. Alternative Supplies of Salt Lake County M&I Water Many alternative sources of M&I water which appear to be comparable in unit cost to the Bonneville Unit are available to Salt Lake County. The following alternatives will be examined: groundwater, Wasatch streams; Jordanelle Reservoir/Utah Lake, and conversion of irrigation use to M&I use. Groundwater '.'••{ Tire average annual use or groundwater for the period 1964-1968 was 126,000 a.f., of this about 45,000-50,000 a.f. was high quality - water for M&I purposes. In the Bonneville Unit EIS, Bureau of Reclamation has estimated that 30,000 a.f. of additional high quality groundwater can be developed. According to a 1971 publication of --• the State of Utah, Department of Natural Resources, and the U. S. Geological Survey, 30,000 a.f. is a bare minimum; a planned development of groundwater could produce up to a total of 200,000 a.f., an increase of 74,000 a.f., without "serious adverse physical effects." For our purposes, it appears safe to assume that an additional 50,000 a.f. is availablefor continuous withdrawal. , The report succinctly sums up the proposed expanded use of groundwater supplies: - - • •..._! "The hydrologic objectives of managing the groundwater reservoir ~~ "~ in Jordan Valley, in general, would be (1) to salvage water that is now wasted through natural discharge (evapotranspiration,• underflow to Great Salt Lake, and seepage to streams when the water cannot be used) and (2) to use the storage capacity of the' groundwater reservoir to supplement or replace surface storage. •" The first objective requires a lowering of groundwater levels in areas of natural discharge; the second requires marked fluctuations of water levels and coordination of withdrawals with the availability of surface-water supplies." • The summary continues by discussing how Deer Creek Reservoir could be used to recharge the groundwater supplies: "The water supply from Deer Creek Reservoir could readily be used for artifical recharge, and such use would eliminate the greatest fault in the present system. As previously explained, carryover-storage privileges may be nullified if runoff is more ,p=,n |
