Laserfiche WebLink
CRDSS <br />TASK MEMORANDUM 2.09-07 <br />Crop Consumptive Use for the Yampa 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 Yampa River <br />Basin. The calculation of CU for the basin is based on a pro-ration of the CU for a portion of the basin <br />(areas associated with diversion structures being modeled) to the area of the full basin obtained from <br />GIS. <br />2.0 DISCUSSION <br />Crop consumptive use has been estimated for selected structures in the Yampa River Basin through the <br />use of the CRDSS-CU model. The CRDSS-CU model calculates irrigation water requirements which are <br />provided to STATEMOD. STATEMOD imposes the irrigation water requirements on a historic <br />hydrology to estimate the water supply available for each structure. The CRDSS-CU model then uses the <br />water supply provided by STATEMOD to calculate the CU for each diversion structure. The process is <br />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 modeled, <br />the CU for modeled structures is pro-rated on the basis of the total area to modeled 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 Yampa River Basin are provided to the <br />CRDSS-CU model via the yampa.dds, the header of this file is shown in Table 1. These structures are <br />only a portion of the structures in the Yampa River Basin. The water supply information for each <br />structure is provided by STATEMOD in the yampa.xcu file, the header of this file is shown in Table 2. A <br />total of 234 diversion structures are modeled in the Yampa River Basin corresponding to a total irrigated <br />area of 61,479 acres. <br />1 <br />12/16/96 2.09-07 CSU/IDS <br />