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procedures. Note that StateMod expects the new variables that control variable <br />efficiency and soil moisture options to be in a certain row, therefore new variables <br />were also added for ground water features, but were not activated. The following <br />variables were added to the control file in the order shown following the variable <br />ireach. Attachment C shows the control file, with additional variables highlighted. <br />- ica11= 0 Switch for detailed call data (0=no detailed call data) <br />- cca11= 0 Detailed call water right ID (not used when icall=0) <br />- iday = 0 Switch for daily calculations (0=monthly) <br />- iwe11= -1 Switch for well operations (-1=no well analysis but file <br />names included in response file) <br />- gwmaxrc = 0 Constant maximum recharge limit (only used when <br />iwell=2) <br />- isjrip = 0 Switch for annual San Juan Recovery program (0=no <br />SJRIP file provided in response file) <br />- itsfile = 10 Switch for annual time series file (10=use all data provided <br />in the *.tsp file) <br />- ieffmax = 1 Switch for irrigation water requirement (1=IWR file <br />provided and variable efficiency used) <br />- isprink = 0 Switch for sprinkler data (0=no sprinkler data used) <br />- soild = 3 Switch for soil moisture accounting (>0=soil moisture <br />capacity is provided in *.par file. The value indicates the <br />depth of the soil zone in feet, soil zone depth = 3 feet) <br />2. Run the Yampa River Basin Model to Create Baseflows when Streamflow Records are <br />Available. The StateMod model version 9.83 was run, using the input files developed in <br />Task 1.1 and in Step 1 above defined in response file ym2001f.rsp, with the -baseflow option <br />for the period 1909 through 1996. This option calculated baseflows by removing the <br />upstream effects of man at each stream gage when historic Streamflow records are available. <br />The resulting preliminary baseflow file, ym2001f.xbg, has missing values where data was <br />unavailable. StateMod's variable efficiency and soil moisture accounting algorithm is used <br />in this step as described in the following Results Section. <br />Use the Mixed Station Model to Fill Missing Baseflows. The Mixed Station Model was <br />originally developed by the Alley and Burns, USGS (1981) for filling missing time series <br />data by linear regression. It is capable of filling time series using the best correlation for <br />each time step based on all available stations. During the CRDSS Phase IIIb efforts, minor <br />enhancements were made to the code and a graphical user interface was developed. The <br />input to the Mixed Station Model is the preliminary baseflow file (ym2001f.xbg) output from <br />Step 2 above. The output from the Mixed Station Model is a filled baseflow file for gaged <br />locations (ym2001f.xbf). <br />4. Run StateMod to Determine Baseflows at Un~a~ed Locations. Based on Area/Precibitation <br />Proration. The StateMod model was run, using the input files developed in Task 1.1 and in <br />Step 1 and 3 above defined in response file ym2001fx.rsp, with the -baseflowx option for the <br />period 1909 through 1996. This option distributes gains seen at gaged Streamflow locations <br />to ungaged locations. The resulting final baseflow file, ym2001fx.xbm, is used in subsequent <br />L:ASecrion Folders\SECD\Carolyn\CDSS\VariableEff Taskl-3.doc 3 of 16 <br />