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• important contributor to potential reduction in downstream eater <br /> availability. As discussed in detail below, the ratio of eater <br />permanently impounded to the total discharge of each subject <br />vaterahed is very low, <br />Designs of all impoundments are presented in gahibit 3, <br />Sediment Control plan, The total volume of dead storage proposed <br />Eor the detention basins in the Middle Creek vaterahed is 91.6 acre- <br />feet. The average annual discharge volume near the mouth of Middle <br />Creek is approzimately 800,000 acre-feet. Thin ie based on <br />measurements taken by the OSGS at their Station No, 09243700, show <br />on Nap 4, Mine No. 3 $ydrology. Comparison of these data <br />demonstrates that eater detention in sedimentation control <br />• structures decreases the total discharge of Middle Creek by <br />approximately 0.01 percent. In addition to the fact that the <br />percentages of eater detention ie very small, potential impact is <br />further lessened due to the fact that the impoundments will fill in <br />the spring during high floe periods when there ie no problaa with <br />eater availability for any purpose. <br />In the eztremely remote event that retention of runoff by <br />mining operations creates an adverse quantitative impact within the <br />proposed permit area or downstream, any injury can be mitigated with <br />eater from CYCC's substantial holdings of senior surface eater <br />rights within the general area, The total quantity of floe rights <br />• is 63.19 cubic feet per second on a decreed absolute basis and 640 <br />cubic feet per second on a conditional basis for a total of 703.19 <br />2.05 - 151 <br />