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Finally, the program allows the user to define the starting year of the extended record (how far <br />back to begin the fill), and the minimum number of concurrent values between independent and <br />dependent stations for filling to occur. It should be noted that the model performs a log <br />transformation of the data prior to the analysis. The model allows for user options for filling <br />which include: the regression type, the number of concurrent with another station that is needed <br />to allow the model to fill data and the beginning year for the filling to begin. More detail on <br />using the options is discussed in Results and Analysis Section. <br />MSM Program Modifications <br />The MSM model was modified in three ways: <br />1. Re-dimensioned to allow for up to 300 stations and 100 years of records. <br />2. Modified to allow the user to select the confidence interval to accept a independent station. <br />3. The model was modified to ignore the zeros when developing the regression analysis and <br />only use positive flow values in the regressions. <br />GUI Development <br />In order to utilize the model a GUI was developed in order to accomplish the following: <br />• Read preliminary baseflow files (*.xbg) developed in Task 11.9 <br />• Fill in missing baseflows at gage points <br />• Generate a report which documents the dependent/independent station selection over time, <br />and corresponding statistical properties <br />• Provide results, which allow the data extension to be validated on a monthly, annual, and <br />basin total basis <br />• Create five baseflow files (*.xbf) for gaged points in which missing data have been filled <br />In addition to the gui and msm program modifications, an additional fortran program was written <br />to perform statistical analysis on the original and filled data sets. The gui reformats files to make <br />them compatible with the fortran programs and to present the output in an acceptable format. <br />Three output files are produced by the program, guis, and subroutines for each basin: the filled <br />data file (*.xbf), the summary output file (*.sum), and the summary statistics file (*.sts). Each is <br />discussed below in addressing the five required capabilities of the program package. <br />There are five preliminary baseflow files from task 11.9, each containing all gage data for a <br />particular basin. This format is different from the files filled in task 11.5, where each file <br />contained data for a specific gage. The five files from task 11.9 correspond to the yampa, white, <br />Colorado, gunnison, and san juan/dolores river basins. The gui from task 11.5 was modified to <br />read one or more of these files in, and create the input file required by the mixed station program. <br />Appendix E E-112 <br />