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therefore adjustments may be necessary for wind velocity readings taken above the ground surface. <br />Wind data are used by the consumptive use model to calculate evapotranspiration. The most <br />probable sources for wind run data are the NWS, Colorado Department of Health (CDH), <br />COAGMET, RAWS, and the UCC. The database entity that will hold these data is . <br />wind_run <br />Solar Radiation <br />Global solar radiation is the amount of solar energy measured per unit area, per unit time, at the <br />ground surface. These data are used by the consumptive use model to calculate the amount of water <br />transpired from vegetation and evaporated from free water surfaces. The most probable sources for <br />radiation data are the NWS, COAGMET, CDH, and Joint Center for Energy Management (JCEM). <br />The database entity that will hold these data is . <br />solar_radiation <br />Relative Humidity <br />Relative humidity is the percentage ratio of the actual vapor pressure to the saturation vapor pressure <br />at an observed temperature. The vapor pressure describes the amount of water vapor present in the <br />air. The saturation vapor pressure describes the state in which water in liquid form can no longer be <br />vaporized and assimilated into the surrounding air. The minimum relative humidity describes the <br />potential for the air to assimilate additional moisture in vapor form. Relative humidity is generally <br />calculated from wet-bulb and dry-bulb temperature measurements. The consumptive use model uses <br />relative humidity to estimate potential evapotranspiration. The most probable sources of relative <br />humidity are the NWS, JCEM, CDH, and COAGMET. The database entities that will hold these <br />data are and . <br />daily_dew_temp monthly_temp <br />Livestock <br />The number of cows, sheep, and hogs are needed on an annual time step to estimate consumptive <br />use. The most probable source for livestock figures is the Colorado Agriculture Statistics (CAS). <br />Population <br />The number of people is needed on an annual time step to estimate consumptive use. The most <br />probable source for population figures is the CAS. <br />Irrigated Acreage <br />The total number of irrigated acres on an annual time step is needed to estimate consumptive use. <br />The most probable source of these data is the CAS. <br />Pan Evaporation <br />Pan evaporation is a measurement of water evaporation from small areas. Pan evaporation <br />measurements can be used to estimate evaporation from large water areas through an adjustment <br />called a pan coefficient. Pan evaporation is used by the consumptive use model and will most likely <br />be obtained from the National Oceanic and Atmospheric Administration (NOAA). <br />4 <br />A275 05.10.94 1.08-1 Greer, Ritsch <br />