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The user can now save the data by clicking the "Save" button or choosing "Save" from the File <br />menu. A prompt is then shown so that the user may select which types of output data are desired. <br />The "Filled Data" option must be chosen in order to save any other data types. The user will then <br />be prompted for the location and name of each output data file. A default name is for each file, <br />which follows CDSS conventions, is provided by the interface. The interface will indicate to the <br />user which type of data is being output and will all a statistical routine to analyze the filled data <br />in this process. <br />After processing the data files or at any time in which the user feels the need to restart, a "Reset" <br />button exists which will initialize the program. This will allow the user to start over without <br />exiting the program. <br />Data Fill Approach <br />Originally the approach to fill the data was to take the five baseflow files (one for each basin) <br />and use them all to fill simultaneously. This was done and the results indicated that there were a <br />high percentage of data filled from dependant stations in other basins. Figures 4 through 8 <br />show the results of this approach. Each figure shows the percentage of data filled and the <br />distribution of dependant gages in each basin that were used to fill the missing values in that <br />particular basin. <br />Analysis of the data that was generated indicated that the filled MSM baseflow data created <br />stream flow estimates that were reasonable. The only drawback was that the unfilled baseflow <br />data files were being created from the Statemod simulation for each basin. If the Statemod data <br />sets were changed, the result would be to change in the simulated unfilled baseflow files data. <br />This change in the unfilled baseflow data could ripple through each of the other five basins, since <br />some of the data may have been used as independent variables in other basins. <br />As a result other approaches to filling the data were tried. The approaches are shown in Table 1. <br />Table 1 -Methods Considered For Filling Missing Data. <br /> Sources of in Basin Sources of out-of--basin <br /> Data to be filled dependant stations dependant stations <br /> Gage <br /> Gaged Gaged Baseflows flows @ <br />A roach Baseflows Flows Baseflows flows all basins Ke sites <br />Original Approach <br />Method 2 <br />Method 3 <br />The alternate methods tried included the filling of gaged data from the in-basin gages and from <br />out-of--basin key gages that were utilized in Task 11. 5 for filing from out of basin sources, <br />A third approach utilized the baseflow for the in-basin filling and the use of the key gages. The <br />advantage of Method 2 and 3 are that changes in base flow files from modification of the <br />Statemod reservoir or diversion data in one basin affect only the MSM data fill in that basin. <br />The disadvantage of using gaged data is that in many cases gaged data is affected by water <br />Appendix E E-115 <br />