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CRDSS <br />TASK MEMORANDUM 2.09-06 <br />Crop Consumptive Use Estimates for the White River Basin for calendar years 1985-1990. <br />1.0 ISSUE <br />This task memorandum describes the calculation of crop consumptive use (CU) for the White <br />River Basin. The calculation of CU for the basin is based on a pro-ration of the CU for a portion <br />of the basin (areas associated with diversion structures being modeled) to the area of the full <br />basin obtained from GIS. <br />2.0 DISCUSSION <br />Crop consumptive use has been estimated for selected structures in the White River Basin <br />through the use of the CRDSS-CU model. The CRDSS-CU model calculates irrigation water <br />requirements which are provided to STATEMOD. STATEMOD imposes the irrigation water <br />requirements on a historic hydrology to estimate the water supply available for each structure. <br />The CRDSS-CU model then uses the water supply provided by STATEMOD to calculate the CU <br />for each diversion structure. The process is described by the following flowchart: <br />demand_cu UNIX script <br />List of Key Structures ---> CRDSS-CU Model ---> Demands for input to STATEMOD <br />STATEMOD Simulation ---> CRDSS-CU with Water Supply <br />To estimate CU for areas larger than the areas being served by the diversion structures being <br />modeled, the CU for modeled structures is pro-rated on the basis of the total area to modeled <br />areas. <br />reportn utility program <br />CU and areas for modeled structures ---> GIS report of total areas ---> Pro-rated basin CU <br />2.1 Structures being Modeled <br />The diversion structures being modeled in STATEMOD for the White River Basin and provided <br />to the CRDSS-CU model via the white.dds file, the header of the specific file used in this process <br />is shown in Table 1. These structures are only a portion of the structures in the White River <br />Basin. The water supply information for each structure is provided by STATEMOD in the <br />white.xcu file, the header of this file is shown in Table 2. A total of 84 key structures are <br />modeled in the White River Basin corresponding to a total irrigated area of 18,799 acres. <br />1 <br />12/16/96 2.09-06 CSU/IDS <br />