Laserfiche WebLink
<br />.' <br /> <br />. <br /> <br />. <br /> <br />Create the input files necessary to simulate the CRDSS Gunnison River Basin Monthly StateMod model <br />using the variable efficiency and soil moisture accounting options. Look at and modify if necessary the <br />exiting aggregated irrigation structures to replicate historic use. Update the data sets to include active <br />reservoir storage as reported by the USBR and extend the model input to include 1997-2000 modeling <br />data. Create new basetlow files, simulate using the historic and calculated data sets, and perform <br />additional calibration as recommended in the Y ampa Variable Efficiency CostlBenefit Memorandum <br />(LRE, November 2001). Update the documentation to include the approach and results for the <br />simulation. <br /> <br />Approach: <br /> <br />Task 5.1 DeveloplRevise Required StateMod Input Files <br />Review the previous Gunnison River Basin modeling efforts to become familiar with basin <br />operations and diversions and previous calibration efforts. Develop or revise the following input <br />files required for StateMod simulation using variable efficiency and soil moisture accounting <br />following the detailed steps outlined in the Yampa Variable Efficiency Procedure Manual <br />Memorandum (LRE, November 2001), Prepare a technical memorandum describing the input <br />file development steps and basin-specific data issues. <br /> <br />Review the aggregated irrigation structures to see if modification is necessary to better address <br />historic use, This will be done by using actual historically diversion records or splitting <br />aggregated structures into smaller aggregations or explicitly model structures. <br /> <br />StateCU Time Series File (* .tsp) - This input file will be developed by the new dmi precu, This <br />file contains estimated actual conveyance efficiency and maximum application efficiency for <br />each agricultural irrigation structure by year. <br /> <br />StateCU Irrigation Water Requirement File (*.iwr) - This time-series input file is based on the <br />direct diversion consumptive use file (*.ddc) created by StateCU'for the basin historic crop <br />consumptive use analysis for the period 1974 through 2000. The Irrigation Water Requirement <br />File will be developed by extending the *.ddc file back to 1909 using the elmi demaudts, <br /> <br />Response File (* .rsp) - The existing response file will be revised by hand to include the names of <br />the new StateMod input files required to run the model using the variable efficiency and soil <br />moisture accounting options, <br /> <br />Control File (* ,cd) - The existing control file will be revised by hand to turn "on' the options <br />that direct the model to use the variable efficiency and soil moisture accounting algorithms. <br /> <br />Operation Right File (* .opr) - The existing operation right file will be revised by hand to include <br />an operating rule to direct StateMod when in priority to use water from the soil moisture <br />reservoir and to provide efficiency information for water released from reservoirs to satisfy crop <br />demands. <br /> <br />Calculated Monthlv Direct Flow Demand File (*c.ddm) - The calculated monthly direct flow <br />demand file will be created using the both the demandts and tstool dmi and following the new <br />approach which determines "preliminary" demands by dividing a structure's monthly irrigation <br />water requirement by the structure's average monthly efficiency. The "preliminary" monthly <br />demands are then compared to historic monthly diversions and the fma1 calculated demands are the <br />maximum of the two. <br /> <br />Task 5.2 Create Basetlows using Variable Efficiency and Soil Moisture Accounting <br /> <br />Page 16 <br />