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RGDSS Memorandum <br />Final <br />To: Ray Bennett, Ray Alvarado, and Andy Moore <br />From: LRCWE, Erin Wilson <br />Subject: Rio Grande Historic Consumptive Use -Annual Irrigation Parameter Time <br />Series <br />Date: June 1, 2004 <br />Introduction <br />This memorandum describes the approach and results obtained under Contingency #3, <br />Annual Time Series Parameter Generation. It has been updated from the June 2002 <br />version to reflect the extension of the previous analysis period through 2002 and peer <br />review refinements to irrigated acreage and well assignments. This task includes <br />generating the following information on an annual basis for the Rio Grande Basin historic <br />consumptive use analysis (1950 through 2002): <br />Irrigated acreage, by crop, for key, aggregated, and ground water only diversion <br />structures, representing 100 percent of the irrigated acreage in the Rio Grande <br />Basin. <br />2. Acreage irrigated by sprinklers for key, aggregated, and ground water only <br />diversion structures. <br />3. Acreage with available ground water supply and associated permitted or decreed <br />monthly pumping volume for key, aggregated, and ground water only diversion <br />structures. <br />Data generated under this subtask are incorporated into the StateCU Crop Distribution <br />input file (rg2004.cds) and the Annual Irrigation Parameter input file (rg2004.ipy), <br />described in the StateCU Documentation, for use in the Rio Grande Basin historic <br />consumptive use analysis. The Annual Irrigation Parameter input file also includes <br />maximum conveyance, flood irrigation, and sprinkler irrigation efficiencies for modeled <br />structures. These parameters are described in the memorandum Rio Grande Historic <br />Crop Consumptive Use -Ditch System Efficiencies. <br />In addition, the file includes an annual flag to consider whether a structure will be treated <br />as a "mutual ditch" system or the analysis will "maximize supply". When the "mutual <br />ditch" option is chosen, surface water is distributed evenly to all acreage in the ditch <br />service area. Acreage with ground water supply then meets remaining irrigation water <br />requirement with ground water, up to the maximum permitted pumping volume. The <br />"maximize supply" option first applies surface water to lands under the ditch without <br />access to ground water, then to flood irrigated lands that have ground water supply. <br />Ground water is used to meet the entire irrigation water requirement on lands with ground <br />C:\Projects\rgdss\finemos_2004\appendA_cropcu_6-2004.doc A-1 of A-10 June 2004 <br />