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0019D2 'Upper Basin to deplete the flow of the river at Lee Ferry by 6.3 maf annually while delivering 7.5 maf annually to the Lower Basin. On the basis of this study the Interstate Stream Commission staff estimates that under the terms of the compacts, New Mexico may deplete the flow of the San Juan River system at sites of use by 727,000 acre-feet annually. The figure 727,000 may be computed as follows: (6,300,000 - 50,000) x .1125 + 24,000 = 727,000. The figure 24,000 in this equation may require explanation. The use of water at sites in the Upper Basin results in a reduction in natural losses between the sites of use and Lee Ferry which is referred to as "salvage by use" (House Committee on Interior & Insular Affairs - Lower Colorado River Basin Project, August-September 1965, Serial #17, page 230). Beneficial consumptive use is measured as depletion at Lee Ferry and each Upper Basin state's consumption at sites of use may exceed, by the amount of salvage by use, the depletion of flow at Lee Ferry that the state is entitled to make. New Mexico's share of such salvage by use is estimated at 24,000 acre-feet . Existing and Proposed Water Commitments Table 2 presents a summary of water available from the Upper Colorado R~ver system for depletion at sites of use in New Mexico and a summary of present and proposed depletions of this water. Further discussion of some of the items of this table may be helpful. The table reflects a future depletion of 226,000 acre-feet annually by the Navajo Indian Irrigation Project. This estimate assumes that the entire project will be served by sprinkler -13-