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Temporary Diversions <br />i <br />Discharge from temporary diversions will be controlled by use or detention <br />i basins and riprap lined channels to reduce energy of the flow. Location and <br />sizes of detention basins are shown on Drawing D-4-7 and D-4-8. <br />Permanent Diversions <br />Permanent diversion ditches will be protected by vegetation and riprap to control <br />erosion as the discharge points. These ditches are also designed to reduce <br />:.r <br />water velocity for erosion control. <br />Underground Workings <br />Surface entries and other accesses to the underground workings are located <br />so that no gravity discharge of water from the mines occurs. <br />Table 4.6.1-1 lists monthly mean flow and their mean over a thirteen year period. <br />' The values are from U.S.G.S. station on North Thompson Creek. <br />Table 4.6.1-1 indicates that a 0.3 cfs reduction in flow at the cessation of <br />mining will have minimal impact on aquatic life. During periods of lower flows. <br />aquatic life Kill be concentrated in pools. Periods of low flow are short <br />in duration and do not significantly impact aquatic life. <br />4-115 (Revised 1/14/87) <br />