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CRDSS <br />TASK MEMORANDUM 1.13-1 <br />U. S. Bureau of Reclamation Annual Operating Plan Model <br />1.0 ISSUE <br />The 24 Month Study Model (24MSM) was developed by the U. S. Bureau of Reclamation (USBR) to <br />provide decision support information for managing the reservoirs in the Colorado River basin. Two <br />versions of the 24MSM existed prior to this project. One was a SUN workstation version used by the <br />USBR regions and the other was a Lotus 123 spreadsheet version used by the Upper Colorado River <br />Commission. The purpose of Task 1.13 was to implement a version of the 24MSM model in the <br />CRDSS. The developed version of the graphical user interface (GUI) for the 24MSM implemented in <br />the CRDSS is termed the CRSMI (Colorado River Simulation Model Interface). The development of <br />CRSMI resolved the following issues: <br />Should a version of the 24MSM be implemented during the first year of the CRDSS project? <br />? <br /> <br />Should the workstation or spreadsheet version be implemented? <br />? <br /> <br />What features of the existing 24MSM will be incorporated in the CRDSS version? <br />? <br /> <br />Can some of the 24MSM graphical displays be used for the Colorado River Simulation Model <br />? <br />(CRSM)? <br /> <br />How will data be supplied to the 24MSM? <br />? <br /> <br />How will the CRDSS version of the 24MSM results be verified? <br />? <br />2.0 DISCUSSION/ANALYSIS <br />The 24MSM model is a monthly water accounting model developed by the USBR. The model has also <br />been termed the Annual Operating Plan (AOP) model. The model simulates the state of 11 reservoirs <br />and major diversions in the Colorado River basin for a 24-month forecast period. The model uses input <br />information developed by the more detailed CRSM. The CRSM is run with various hydrologic traces to <br />determine detailed water delivery schedules and reservoir elevations and releases. CRSM output is used <br />to develop the input information for the 24MSM. While the CRSM explicitly contains the operational <br />policies of the Colorado River and computes reservoir releases, the 24MSM requires user input to <br />directly define reservoir releases. The 24MSM is driven by inflow projections, forced releases from <br />certain reservoirs, and target contents for reservoirs. Output from the model includes reservoir state <br />information (elevation, storage, evaporation, and bank storage) and hydropower production. A <br />description of the 24MSM and its use is provided in the paper by Fulp et al. (1991). <br />The 24MSM, in conjunction with the CRSM, is used in the development of the AOP for Colorado River <br />reservoirs (USBR 1994). The AOP establishes water delivery targets and reservoir releases to meet the <br />"Law of the River" and other appropriate operational objectives. The plan considers operations resulting <br />from three hydrologic scenarios: the probable maximum, the most probable, and the probable minimum <br />1 <br />A275 01.09.95 1.13-1 Fontane <br />