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reservoir inflow conditions. A basic description of the 24-month operations plan is given by Seaholm <br />(1984). The 24MSM is used by the Upper an d Lower Colorado Regions of the USBR to monitor and <br />adjust reservoir operations throughout the year, on a monthly basis, to achieve the AOP. The model is <br />used primarily by Brad Vickers in the Upper Colorado Region and Bruce Williams in the Lower <br />Colorado Region. On a monthly basis, they update the data files to reflect current conditions and <br />modified inflow forecasts and delivery schedules. They then adjust the forced releases from certain <br />reservoirs and diversion schedules to attempt to meet the AOP. The mechanism for adjusting the forced <br />releases is based upon the experience and judgment of Brad Vickers and Bruce Williams. <br />The 24MSM was originally developed on the USBR mainframe and ported to the SUN workstation by <br />CADSWES in 1990. At that time, CADSWES was contracted to develop a GUI for the model. The <br />model terminology used was the 24 Month Study Model (24MSM) and the developed interface was <br />termed the 24 Month Study Interface (24MSI). A complete description of the GUI is provided in the 24 <br />Month Study Project Documentation by Theobald and Fulp (1991). The philosophy of the GUI was to <br />maintain the integrity of the existing model and its input and output file structures. The 24MSI was <br />intended to provide an easy-to-use facility to create and evaluate operational scenarios and to graphically <br />display results. <br />In 1987, the Upper Colorado River Commission staff developed a Lotus 123 spreadsheet version of the <br />24MSM. The spreadsheet version is described in detail in its user?s manual (1987). The spreadsheet <br />model is a scaled down version of the USBR 24MSM that retains the basic functionality of the 24MSM. <br />Using the spreadsheet version, Upper Colorado River Commission staff can generate operating plans <br />similar to those produced by the USBR. The spreadsheet version of the model was updated in 1991. The <br />spreadsheet version of the model has the flexible graphics capability of the spreadsheet software for <br />displaying model results. <br />As described in the previous task memorandum for this task, both the Lotus 123 version and the SUN <br />workstation version of the 24MSM model were obtained by RTi. Considering both of these versions and <br />in coordination with the State, RTi selected the SUN workstation version of the 24MSM to implement <br />into the CRDSS. <br />The design and operation of the 24MSI developed by CADSWES is described in detail by Theobald and <br />Fulp (1991). The GUI is designed around a basic philosophy of four main modules: FILE, TEXT, <br />GRAPH, and IMAGE. The screens used in the 24MSI have a control bar at the top of the screen with the <br />selections for each of the four modules. At the bottom right of the screen are four buttons: QUIT, <br />ESCAPE, RUN, and PRINT. The screen design is common to almost all screens in the 24MSI. The <br />functions of these buttons can be summarized as follows: <br />FILE - This provides file management capabilities, primarily to select the files to be loaded into <br />? <br />the model. <br /> <br />TEXT - This provides a text-based display of the input and output files and editing capabilities <br />? <br />for the input file. The 24MSI restricts the model parameters that can be edited to eight <br />frequently used parameters. The most commonly used parameter is the FRCREL parameter, <br />which stores the schedule of forced monthly reservoir releases. Selecting the FRCREL <br />parameter leads to a menu that contains Upper Colorado and Lower Colorado. Choosing one of <br />the regions leads to a choice of appropriate reservoirs for editing. <br /> <br />2 <br />A275 01.09.95 1.13-1 Fontane <br />