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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. a5y- <br /> Creek Ditch No. 2 6"; 11 ha relocated to avoid conflict <br /> with the excavation. Water not used for irrigation during <br /> 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 />