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<br />000555 <br /> <br />DOCUMENTATION AND USAGE OF PROGRAM <br />MODSIM <br /> <br />Introduction <br /> <br />Data file creation and editing for MODSIM is accomplished <br />using a menu-driven program called MODSET. Program <br />MODSET uses a query-response format and in most cases <br />supplies the user with either default data information or <br />current contents of the data file being edited. <br /> <br />An additional program called ECHO IT provides the user <br />with an organized summary of all system data input, exclusive <br />of hydrologic and demand data which have been entered as <br />time series. This latter information is available in the output <br />from MODS 1M itself. <br /> <br />Program output from MODSIM is composed primarily of <br />tabular listings, including specially formatted output for ease <br />of transfer to spreadsheet programs for graphical plotting and <br />further analysis. <br /> <br />True color graphic screen displays are also available for all <br />flow, storage and demand information in the system. <br /> <br />Since output information can be quite extensive for river <br />basin simulation runs, certain options are available for <br />limiting the size of the output file. These include the <br />possibility of simulating and/or printing out information for <br />only a certain user-specified subsequence of time intervals for <br />specific nodes and links, rather than the entire operational <br />horizon and for all portions of the system. For example, a 20 <br />year simulation may be performed over monthly time <br />intervals, but only a five year drought period within that <br />period may be of particular interest. <br /> <br />24 <br />