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by subarea. The highest IWR by subarea, by county, and by HU is in Routt 14050001 (46,035 acre- <br />ft), Routt (51,820 acre-ft), and HU14050001 (60,674 acre-ft), respectively. <br />Table 6 shows the 6-year average annual IWR in terms of unit depth for each subarea. The average <br />IWR value for the entire Yampa River basin is 1.16 feet. The highest per unit depth IWR by subarea, <br />by county, and by HU is in Routt 14050003 (1.53 feet), and the lowest IWR is 140500001 Rio <br />Blanco (0.64 feet). <br />3.0 CONCLUSIONS/RECOMMENDATIONS <br />The 6-year average IWR for the Yampa River Basin is estimated to be 99,299 acre-ft. The water <br />supply information should be considered directly when estimating the actual consumptive use. The <br />CRDSS consumptive use (CRDSS-CU) program has this capability. By linking CRDSS-CU to the <br />Water Resource Planning Model (STATEMOD), estimates of consumptive use are subject to the <br />actual availability of water supply. The results of this process are presented in Task Memoranda <br />2.09-05 - 2.09-08. Other uses (non-irrigation CU) are presented in Task Memoranda 2.09-10 - 2.09- <br />13 and total values for the entire Colorado River Basin are presented in Task Memorandum 2.09-20. <br />Depending on the level of detail desired, several different data sets can be prepared for estimating <br />IWR in the Yampa River basin. Smaller subareas may be chosen to increase the representativeness <br />of the consumptive use data. For example, the growing season of a particular crop may not be <br />uniform across a subarea defined by HU and county combination, thus, breaking the subarea into <br />smaller areas would allow assigning a more representative growing season for each smaller area. <br />Similarly, when the weather parameters in a HU-county subarea are derived by weighting two or <br />more weather stations, it may be better to break the subarea into smaller areas such that each smaller <br />area is associated with a single weather station. <br />4.0 OTHER ESTIMATES OF CONSUMPTIVE USE <br />The CRDSS-CU model incorporates an enhanced version of the SCS Blaney-Criddle methodology <br />which includes a monthly soil moisture budget. This allows soil (i.e., water holding capacity, and <br />AWC) and management (i.e., management allowed depletion, MAD) characteristics as well as winter <br />soil moisture carry-over to be incorporated in the estimation of IWR. Using the enhanced version of <br />the CU model, new estimates can be obtained. <br />2 <br />11.26.96 12.09-03- IDS/CSU <br />