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OOOLJ70 4. The Upper Colorado Basin will be unable to put any of this additional water to use until approximately 2040. 5. The demonstration program from 1986 through 1990 will produce approxi- mately a net 13 mg/L reduction, for TDS at Imperial Dam with a total 100 mg/L reduction produced by the full basin-wide operational program. 6. No additional storage was projected to be built to make use of the additional water provided by CREST. 7. The Upper Colorado Basin would need to agree to a long-term depletion schedule and enhancement program that results in average deliveries of 10.6 million acre-feet to the Lower Basin. A total 210 mg/L'of salinity reduction is required by 2010, even under a depletion schedule that assumes the Upper Basin reached the 5.8 million acre-feet level in 2040. Thus, even if the basin-wide operational program is able to del iver gO mg/L, there is still a need to del iver an additional 120 mg/L of reduction by 2010, with more reduction required beyond that point. The full potential of the presently scheduled USBR and USDA WQIP will deliver approximately 190 to 200 mg/L of reduction. Although the CREST Program and the basinwide operational program offer significant potential for augmentation and salinity benefits, the following issues must be addressed: 1. Water rights to any additional water added via weather modification are unresolved. Basin states will claim direct use of all such supplies falling within State boundaries. 2. The Upper Basin States will be at a great disadvantage in using any additional water supply unless additional storage capability is available. 3. The CREST program is designed to quantify the augmentation potential in the Colorado River Basin. The results of this program may result in new water production estimates. WQIP Construction Schedules Figure 2 shows the construction schedule which was utilized in the develop- ment of the CRSS projections. The proposed schedules are preliminary and will change as specific unit-by-unit programs develop. Cost Effectiveness For comparison purposes, the relative cost-effectiveness and salt reduction at Imperial Dam are displayed on charts for the CRWQIP (see fig. 3), the Soil Conservation Service and Bureau of Land Management projects (see fig. 4), and the CREST program (including the basin-wide operational program, see fig. 5). The estimates represent, at best, appraisal level costs in some cases and feasibility level costs in other cases, so caution is urged in drawing major comparative conclusions or attempting to prioritize projects on a cost basis 12