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-zl- <br />D. SITE-SPECIFIC HYDROLOGY <br />1. Watersheds Impacted by hlining <br />tlorthern's mining operations may produce hydrologic impacts on at least <br />four watersheds (Figure 4 j. These include: <br />Watersheds 1-3 <br />Curtis Creek <br />Because Curtis Creek is tributary to the White River it is conceivable that <br />very minor impacts on the flow of the 4lhite River could also occur. <br />2. Annual Water balance of Curtis Creek <br />Table 4 is the estimated potential water balance for the Curtis Creek <br />watershed. This balance was computed using procedures developed by Leaf <br />(1977a). A conservative estimate of generated runoff (including surface runoff, <br />ground-eater flow, and deep seepage) appears to be at least 1.9 inches in the <br />average year. <br />Tattle 4 - Estimated Potential Water Balance, Curtis Creek <br />Precipitation Evapotranspiration <br />Interval (inches) (inches) <br />Oct. 1 - Feb. 28 6.12 1.4 <br />March 1 - June 30 5.50 4.7 <br />Ju'y 1 - Sept. 30 4.51 8.1 <br />7ota1 16.13 14.2 <br />Average Annual Water Excess: 1.9 inches <br /> <br />