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structure are located. When determining what percent of a county/HUC is being modeled we sum all the <br />areas associated with the structures being modeled in a given county/HUC. If the lands and the diversion <br />structure that serves them are not located in the same county/HUC an error would be introduced in <br />determining the percentage of land being modeled. Also, the weather stations to use for a structure <br />would change. It would be better in the future to assign county/HUC locations to the diversion structures <br />based on the location of the majority land-area served by each structure and not the location of the <br />structure. <br />3.0 CONCLUSION <br />The crop consumptive use and amount of water short in a county-huc combination are estimated using <br />the results of CU calculations at the structure level. The 6-year annual average estimated CU (for the <br />diversion structures being modeled) is 235,285 acre-ft which pro-rated to the total irrigated areas in the <br />14 county-huc combinations being modeled becomes 341,170 acre-ft. The 6-year annual amount of water <br />short for the diversion structures being modeled is 39,968 acre-ft which pro-rated to the total irrigated <br />areas in the 14 county-huc combination being modeled is 60,429 acre-ft. <br />Based on the issues presented in the issues for review section of this task memo, it appears that some of <br />the shortages presented are created by both the fact that no soil moisture accounting is being used <br />(shortage in the late part of the season with larger than needed diversion at the beginning of the season) <br />and individual ditches with large discrepancies between historical diversions and CU demands. In either <br />case, the diversion records and the areas assigned to the structure should be verified. <br />4 <br />Page <br />12/16/96 2.09-05 CSU/IDS <br />