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I I I I I I I I I I I I I I I I I I I 5. Compute the estimated cost per acre-foot by dividing the project cost by the increase in average annual runoff determined in 4 abovE~. Cloud Seeding Project Areas and Operational Cost Utah has four active cloud seeding project areas, as shown in Figure 1. The winter storm systems in these areas are being seeded with ground-based generators using silver iodide. The Central and Southern Utah Project (CSUP), comprised of the Central/Southern Utah and the Tooele County project areas, is sponsored by the Utah Water Resources Development Corporation. The Northern Utah Project (NUP), comprised of the West Box Elder and the East Box Elder/Cache County project areas, is sponsored by the Bear River Water Conservancy District and Cache County. North American Weather Consultants is the contractor for each of these projects. The estimated cost for the Northern Utah Project is $87,800 for the 1999-2000 season. The estimated cost for the Central and Southern Utah Project is $166,500 for the 1999-2000 season. The total estimated cost for both projects is $254,300. For the 1999- 2000 season, the state, through the Division of Water Resources, is cost-sharing with the local sponsors at 50 percent ($127,~50). A verage Annual Runoff in the Cloud Seeding Project Areas As part of the State Water Plan, the Utah Division of Water Resources has published annual stream flow charts for the 1941-1990 period for most streams in the state. The division has also published hydrologic inventories and water budget reports for most areas of the state. Based on data from these reports, an estimate of the average annual runoff for the 50-year 194.1--1990 period has been made for the cloud seeding project runoff areas. A summary of the estimated annual runoff data is shown in Table 1. The estimated runoff data for each runoff area in the project areas are tabulated in -2-