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<br />runoff. A higher percent of the increased snow water runs off because the base conditions <br />account for most of the losses such as infiltration and evaporatbn. <br /> <br />The choice of a 10 percent increase in April 1 snow water rontent was arbitrary. It <br />represents an easy reference to relate expected ncreases in runoff and is in the expected <br />range of increased April 1 snow water content due to cloud seeding. The actual increases <br />in April 1 snow water content are used in the analysis below to estimate the increase in <br />runoff for each project area. <br /> <br />Estimated Increased Runoff and Cost per Acre.Foot <br /> <br />The annual increase in runoff for a 10 percent increase in April 1 snow water <br />content for each streamflow station in Table 3 is volume-weig,ted for all streamflow <br />stations in each river basin in the cloud seeding project areas. These weighted values are <br />multiplied by the increase in the April 1 snow water content from the target and control <br />analysis and divided by 10 to obtain a runoff factor. The increase in annual runoff due to <br />cloud seeding is estimated by multiplying the average annual runoff by the runoff factor. <br />The results are shown in Table 4. The estimated average annual increase for the total <br />cloud seeding project area is 249,600 acre-feet. The Northern Utah Project increase is <br />106,900 acre-feet. The Central and Southern Utah Project increase is 142,700 aO"e-feet. <br /> <br />The increased runoff, project cost and cost per acre-foot of vvater developed from <br />the cloud seeding projects are shown in Table 5. The total estimated cost of both projects <br />for the 2000 water year is $254,300, resulting in a cost of about one dollar ($1.02) per <br />acre-foot of water developed from cloud seeding. The costs per acre-foot for the Northern <br />Utah Project and the Central and Southern Utah Project are $0.82 and $1.1 7, respectively. <br /> <br />The above estimated costs per acre-foot of water developed by cloud seeding are <br />for surface runoff and do not include incre ased recharge to the groundwater system. The <br />April 1 snow water contentfor the Central/Southern Utah project area some years may not <br />represent the peak snow water rontent because of early snowmelt in the southern portion <br /> <br />-8- <br />