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1 <br /> Impact from the Mining Operation <br /> Surface Water. Mining of the site to extract the gravel <br /> ' resource will result in the elimination of the irrigated <br /> pasture. As the site is concurrently reclaimed, irrigation <br /> ' will again be required to reestablish vegetation. D� <br /> Creek Ditch No. 2 w be relocated to avoid conflict <br /> with the excavation. Water not used for irrigation during <br /> 1 mining will be temporarily available for use elsewhere <br /> along South Boulder Creek by leasing the Dry Creek No. 2 <br /> ' shares. <br /> Lake surfaces will also be increased resulting in greater <br /> ' evaporation losses which will be compensated for by a net <br /> reduction in irrigated area. Depletion of the flow in South <br /> ' Boulder Creek under present and future conditions will <br /> ' occur as the result of evaporation from open lake surfaces <br /> and the evapotranspiration of crops during the growing process. <br /> To determine the magnitude and extent of these depletions <br /> and to provide for balancing stream conditions under present <br /> ' and future land uses., unit values for evaporation and <br /> ' irrigation consumptive use have been derived. <br /> ' Records of total evaporation measured by a Colorado sunken <br /> pan at Fort Collins, as published by the U. S. Weather Bureau <br /> from 1950 through 1973, were analyzed to determine lake <br /> ' surface evaporation rates . The 10-year period 1951 through <br /> ' C-6 <br />