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CRDSS <br />TASK MEMORANDUM 1.14-13 <br />Consumptive Use Model <br />?cunonet? Data Management Interface - Returns Consumptive Use Model <br />Input Files For Other Uses (Non-Evapotranspiration) <br />1.0 ISSUE <br />The consumptive use (CU) model requires several formatted input files. At the highest level, a user <br />chooses to run the CU model using a specified area and time period. The area, represented by one or <br />more spatial identifiers, and the time period are passed on to several data management interface (DMI) <br />utilities, each of which supplies one or more of the required input files. <br />This DMI generates a formatted data file required by the non-evapotranspiration components of the CU <br />model. Files having ?.oth? as a suffix contain general information about non-evapotranspiration <br />components. <br />2.0 DISCUSSION/ANALYSIS <br />The IDS Group is responsible for creating this routine; however data will be retrieve d from the CRDSS <br />database by a low-level DMI provided by RTi. The low-level DMI directly queries the database and <br />returns required data to the calling routine. The input and output formats for the low-level DMI will be <br />defined based on the direct effects they have on the construction and generalization of the DMI for other <br />uses. <br />The general function of this DMI is to return formatted data on non-evapotranspiration consumptive uses <br />within the specified area and time period. This includes the following categories: livestock use, <br />evaporation from stock ponds, evaporation from reservoirs, municipal use, industrial use, and exports. <br />The file assumes the availability of information found in the climate files (?.wbc? or ?.wpm? as a suffix). <br />Livestock <br />The model calculates livestock consumptive use for each spatial identifier using a monthly head count <br />and average daily consumption in gallons per head per day for each type of livestock in the spatial <br />identifier. <br />Stock Ponds <br />The model calculates stock pond consumptive use for each spatial identifier. The low-level DMI returns <br />stock pond volumes aggregated into two values: total volume of ponds with elevation <= 7750 feet and <br />total volume of ponds with elevation > 7750 feet. The model converts the total volumes to approximate <br />surface areas and then applies a fullness factor based on the elevation category above. For stock ponds <br />with an elevation <= 7750 feet, the fullness factor defaults to 0.75. For stock ponds with an elevation <br />> 7750 feet, the fullness factor defaults to 0.87. The model computes evaporation and precipitation for <br />each surface area using weighted climate data for the specified area (the union of the spatial identifiers). <br />These data are found in the climate files (?.wbc? or ?.wpm? as a suffix). <br />1 <br />A275.01.09.95 1.14-13 CSU IDS <br />