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, and They are derived from the water <br />monthly_water_class daily_water_class. <br />classification codes within the records of each of these entities. <br />Instream Flow/Nonconsumptive Demand <br />Instream flow describes the minimum volumetric flow rate that must be maintained in a stream to <br />meet environmental, recreational, or other requirements. Instream flow rates will be used by the <br />water rights planning model. The most probable sources for these data are the State and CWCB. <br />The database entities that will hold these data are , <br />annual_water_class <br />, and . They are derived from the water <br />monthly_water_class daily_water_class <br />classification codes within the records of each of these entities. <br />Virgin Stream Flows <br />Virgin stream flows describe the hypothetical volumetric flow rates in a stream (storage reservoirs or <br />diversions), absent any activities by man. Virgin stream flows, if needed by the water rights <br />planning model, must be manufactured. RTi and Wheeler are responsible for manufacturing these <br />time series. The database entity that will hold these data is . <br />monthly_virgin_flow <br />The most important factor in the determination of consumptive use from agricultural land areas is <br />evapotranspiration. Evapotranspiration is the evaporation of water from soil, snow, ice, and water <br />surfaces, plus transpiration. Transpiration refers to losses and use of water to and from vegetation. <br />Several factors affecting evapotranspiration include air temperature, precipitation, solar radiation, <br />wind, and soil moisture. <br />Historic Precipitation <br />Historic precipitation data describe the depth of water which has fallen as rain over a specified <br />period for a specific location. The consumptive use model requires both average daily and average <br />monthly precipitation values. The average monthly precipitation values can be derived from the <br />daily values. The most probable sources for precipitation data are the National Weather Service <br />(NWS), Remote Automatic Weather Stations (RAWS), Utah Climate Center (UCC), and Colorado <br />Agricultural Meteorological Network (COAGMET). The database entities that will hold these data <br />are and . <br />daily_precip monthly_precip <br />Historic Temperature <br />Historic maximum and minimum air temperatures on a daily interval are required by the <br />consumptive use model. The consumptive use model also requires average monthly and daily <br />temperatures which can be derived from the daily maximum and minimum temperature values. The <br />most probable sources for air temperature data are the NWS and COAGMET. The database entities <br />that will hold these data are , and . <br />daily_min_temp daily_max_temp monthly_temp <br />Wind <br />Historic wind data describes the wind speed at a specific elevation above the ground for a specific <br />location. The elevation associated with a wind velocity measurement is important because some of <br />the evapotranspiration equations under consideration require wind velocity at a specific height and <br />3 <br />A275 05.10.94 1.08-1 Greer, Ritsch <br />