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Annual Time Series File. The structure time-series file (ym2001.tsp) was created <br />using a spreadsheet for this analysis, but will eventually be created using the DMI <br />precu. This file provides StateMod with maximum efficiency information, acreage <br />served by ground water, and acreage served by sprinklers. Information is provided <br />for each diversion structure for every year in the simulation (1909 through 1996). For <br />the Yampa River Basin analysis, the maximum combined conveyance and application <br />efficiency was set to 60 percent for all structures. Acreage served by ground water <br />and sprinklers were both set to zero. See the StateCU documentation for more <br />information regarding format and content of the structure time-series file. <br />Irrigation Water Requirement File. The Yampa River Basin consumptive use <br />analysis was performed under the CRDSS contract for the period 1976 through 1996. <br />The resulting irrigation water requirement file (yampat.ddc) is a standard StateMod <br />formatted output file and was not regenerated for this analysis. The dmi demandts <br />was used to estimate historic irrigation water requirement (IWR) from 1909 to 1976 <br />by applying the same wet/dry/average month approach used to fill historic diversion <br />records in the Yampa. This approach used the IWR determined for the period 1976 <br />through 1996 and, based on indicator stream gages, computes wet, dry, and average <br />IWR for each month. These are then used to fill in the missing months prior to 1976. <br />The resulting filled data was written to file ym2001.iwr. Attachment A is the <br />demandts command file used. See CRDSS Yampa River Basin Documentation <br />(Yampa River Basin Water Resources Planning Model Final Report, March 2000) for <br />more detail on the determination of wet, dry, and average conditions. <br />Note that this file only contains information for irrigation structures, as defined in the <br />StateMod Direct Diversion Structure File (ym2001.dds) by the variable demscr <br />(demscr= 1, 2, 3, 4, or 8). Other types of structures, such as municipal and industrial <br />(demscr=6), carriers (demscr=5 or 7), and transbasin structures (demscr=6), do not <br />have irrigation water requirements in this file. These structure efficiencies are set in <br />the *.dds file and, unlike irrigation structures, do not vary with water supply. <br />Response File. The StateMod simulation uses a different response file for each of the <br />two StateMod simulations described below in Steps 2 and 4. These response files <br />(ym2001f.rsp and ym2001fx.rsp) were revised to include the filenames or filename <br />placeholders required to simulate with the variable efficiency and soil moisture <br />accounting enhancements. Attachment B shows the revised response files, with the <br />additional filenames highlighted. As presented, three new files were added to include <br />variable efficiency and soil moisture accounting. These are located near the bottom <br />of the file, and include an annual time series file (ym2001.tsp), a irrigation water <br />requirement file (ym2001.iwr), and a parameter file (yampat.par). In addition, three <br />new files were added as placeholders well files. These are dummy files since wells <br />are not included in the Yampa River Basin model. <br />• Control File. The StateMod control file (ym2001.ct1) was revised to include the <br />controls required to activate the variable efficiency and soil moisture accounting <br />L:ASecrion Folders\SECD\Carolyn\CDSS\VariableEff Taskl-3.doc 2 of 16 <br />