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Final <br />Memorandum <br />To: Ray Alvarado and Ray Bennett <br />From: LRCWE, Erin Wilson and Beorn Courtney <br />Subject: CRDSS Variable Efficiency Evaluation -Task 1.3, Run StateMod to Create <br />Baseflows using the Variable Efficiency and Soil Moisture Accounting Approach <br />Date: August 6, 2001 <br />Introduction <br />The purpose of this task was to develop baseflows for use in subsequent StateMod simulations <br />using the StateMod's enhanced variable efficiency and soil moisture accounting algorithm. The <br />resulting baseflows were then compared to baseflows developed during the CRDSS simulation <br />for the period 1909 through 1996 in order to quantify the magnitude of change associated with <br />using the enhanced approach. <br />Approach <br />The following approach was followed for Task 1.3: <br />Create Required New or Revised Input Files. In Task 1.1, input files were developed for <br />StateMod with the new DMIs. These input files were compared to previous CRDSS input <br />files and determined to be the same except where new data has been added to accommodate <br />recent StateMod enhancements (See Task 1.1 Memorandum). In addition, the enhanced <br />StateMod (Version 9.83) was executed using the new input files with the enhanced variable <br />efficiency and soil moisture accounting features inactive. The simulation results duplicated <br />the previous CRDSS results. <br />In order to create baseflows using the StateMod enhancements, several new files needed to <br />be developed or revised. These files included the structure parameter file (*.par), the <br />structure time-series file (*.tsp), the irrigation water requirement file (*.ddc), the StateMod <br />response files (*.rsp), and the StateMod control file (*.ctl). The following includes a brief <br />description of these files. The Procedure Manual developed under Task 3 provides more <br />detailed information required to create/modify these files. <br />• Parameter File. The structure parameter file (yampat.par) from the Yampa River <br />Basin consumptive use analysis was used directly without modifications. This file <br />provides StateMod with an estimated soil moisture holding capacity, in inches per <br />inch, for each irrigation diversion structure. See the StateCU documentation for more <br />information regarding format and content of the structure parameter file. <br />L:ASecrion Folders\SECD\Carolyn\CDSS\VariableEff Taskl-3.doc 1 of 16 <br />