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Figure 4. Stream accretion over long-term annual recharge <br /> Annual Recharge Events:February at 100 acre-feet <br /> 100 — <br /> 90 <br /> d <br /> 80 <br /> r.. <br /> IL) 70 <br /> C) <br /> �. 60 <br /> 50 —SDF 480 <br /> 40 <br /> 30 <br /> 20 <br /> 10 <br /> 1 10 19 28 37 46 55 64 73 82 91 100 109 118 127 136 145 <br /> Time [years] <br /> The Mercure#1 site has already been selected by the Union Ditch Company as <br /> a priority location for recharge. Based on recent estimates made at the site, it <br /> may be possible to develop a pond with a storage capacity between 10 and 20 <br /> acre-feet. Although a soil test has not been conducted at the site, the Soil Survey <br /> of Weld County indicates a minimum infiltration rate of 2 inches per hour (4 feet <br /> per day) in the top 5 feet of the soil profile. Assuming that water will infiltrate only <br /> through the bottom of the recharge pond (which is an area equal to 2.5 acres), <br /> the expected rate of infiltration is 5 cfs. It is likely that this rate will decrease once <br /> the soil under the pond becomes saturated. If the Union Ditch is capable of <br /> delivering 3 cfs to this site (which is believed to be a low enough rate to not fill up <br /> the pond too quickly), then a total recharge of 6 acre-feet per day on a constant <br /> basis can be reasonably expected. Alternatively, it may be possible to increase <br /> the inflow rate to the pond, fill the pond, stop filling, and resume filling once the <br /> pond has drained. This operation may prove to be most beneficial with more than <br /> one site because water delivery may be cycled between ponds during the filling <br /> and draining periods. <br /> Preliminary Cost Estimate <br /> Table 3 provides a preliminary estimate of initial probable costs for developing the <br /> recharge project. Primary expenditure items expected are the excavation of the <br /> Aqua Engineering, Inc. Recharge Project Potential <br /> February 17, 2004 - 8- <br />