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-52- withdrawal of water by the Blue Ribbon Mine will occur. This analysis ignores the pumping of mine inflows back into the surface water system. This total depletion amounts to about 0.148 of the average streamflow (49.3 cfs) and 3.18 of the low flow (2.23 cfs) in Hubbard Creek as measured above the Blue Ribbon Mine. Cumulative Hydrologic Effects on Ground Water and Surface Water Resources - Finding An assessment of the probable hydrologic consequences of the mining operation and an assessment of the probable cumulative impact of all anticipated mining in the general area on the hydrologic balance has been made. Pursuant to Rule 2.07.6(2)(c), the Division finds that the Mt. Gunnison mining operation has been designed to prevent material damage to the hydrologic balance outside the permit area. REFERII9CFS Hamon, W. Russell, 1961. Estimating Potential Evapotranspiration. Journal of the hydraulics Division, ASCE May, 1961: 107-119 National Oceanic and Atmospheric Administration. Climatological Data, Colorado. Ashville, North Carolina. U.S. Army Corps of Engineers, 1960. Runoff from Snowmelt, Engineering and Design Manuals, EM 1110-2-14406. U.S. Government Printing Office, Washington, D.C. U.S. Geological Survey. Some Engineering, and Geologic Factors Controlling Coal Mine Subsidence in Utah and Colorado, U.S.G.S. Professional Paper Number 969, U.S. Department of the Interior, Washington. D.C. U.S. Geological Survey. Water Resources Data of Colorado. U.S. Department of the Interior, Washington, D.C. U.S. Department of Interior, Bureau of Land Management, West-Central Colorado Coal Environmental Statement. Volumes 1, '2, and 3. U.S. Weather Bureau. Normal Annual Precipitation and Normal May- September Precipitant, 1931-1960, State of Colorado. Water Supply Forecast Center, Western Region, Salt Lake City, Utah.