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large water using type plants, can equal or exceed the evapora- <br /> tion from a free water surface. <br /> ' There are a number of ways used to estimate or measure the <br /> amount of consumptive use from land. That most commonly used <br /> in the arid western region is the Blaney-Criddle method utilizing <br /> temperature and daytime hours. This method has been used <br /> extensively by the Soil Conservation Service. <br /> Using the Blaney-Criddle method, the consumptive use for pasture <br /> grass is determined to be 19. 35 inches or 1. 61 feet per year. <br /> ' Total consumptive use for the 100 acres of pasture grass at <br /> the mining site is then 161 acre-feet annually. <br /> 1 i <br /> Total evaporation in the Longmont area is 40 inches per year <br /> ePrecipitation is about 12 inches per year. Net evaporation <br /> ' is, therefore, 28 inches per year. Eighty-two acres of lake <br /> surface will use 191. 3 acre feet of water in evaporative loss. <br /> ' Evaporation accounts for all water use during future conditions. <br /> Water consumed by the revegetated dry land areas will be <br /> derived from effective precipitation. <br /> ' G-5 <br />