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Scenario 2 -After Mining <br />1) The permanent lake will be approximately 6.6 acres in size, which may fluctuate between 6.2 <br />acres and 6.7 acres, depending upon the river level and water inflow from irrigation uphill. Since <br />the lake bottom and sides aze always saturated due to the level of alluvial water, no losses will occur <br />due to infiltration. Losses will occur due to evaporation at the water surface. Based upon evapora- <br />tion data for this location from the State Engineers office and precipitation data for this azea, this <br />pond will evaporate 42 inches or 3.5 acre-feet of water per acre of water surface. Since the existing <br />pond will be absorbed by the new lake and the pond already has adjudicated water rights, this azea <br />must be subtracted. This is an area of 0.45 acres. Therefore, the azea of new water surface is only <br />6.2 acres. This results in a consumptive use of 21.7 acre-feet annually. <br />Since the site was previously used for alfalfa imgated field, the consumptive use for this past irriga- <br />tion is calculated at 1.72 acre-feet per acre per year of total effective precipitation and loss in the <br />plants. This is a credit of 10.66 acre feet ner yeaz. <br />Therefore the actual consumptive use after mining will be 21.7 ac ft/yr - 10.66 ac-fUyr = 11.04 acre <br />feeUvr• This will occur every year that the lake is in place. <br />For the yeazs of mining, a substitute water supply plan will be submitted to the Division of Water <br />Resources for 2.59 acre feet per yeaz. After mining, this amount will be changed to 11.04 acre feet <br />per yeaz. These are the amounts that will be supplemented in the augmentation plan submitted to <br />the Division of Water Resources. The landowner will maintain this augmentation plan after the site <br />is reclaimed. <br />Nor[h Fork Pit Mazch 04 23 <br />