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CRDSS <br />TASK MEMORANDUM 1.12-1 <br />Big River Model Prototyping <br />1.0 ISSUE <br />The purpose of this task memorandum is to document the status of the development of the prototype Big <br />River Model (BRM). The existing Colorado River Simulation System (CRSS), as developed by the <br />U.S. Bureau of Reclamation (USBR), is composed of computer programs, databases, and input data files, <br />with the main component being the Colorado River Simulation Model (CRSM). CRSM is a <br />comprehensive simulation model that takes into account water supply, flood control, hydropower, and <br />salinity loading in the basin, while incorporating complex legislative requirements and reservoir <br />operating strategies. The model accommodates consideration of reservoir operating rule curves, shortage <br />and surplus strategies, river bank storage, evaporation, reservoir capacity and storage, sedimentation, <br />water routing through the system, runoff forecasting, and hydropower generation. CRSM simulates <br />riverflows in monthly time increments proceeding from the upstream end of the basin to the lower <br />reaches. Two key components of the CRSS are the hydrology input files and the demand input files. <br />The USBR is developing a workstation replacement for the CRSS. These development efforts are being <br />monitored as described in Task 1.11. Because of the uncertainties regarding the timing of the completion <br />of the project, the decision was made to port the current CRSS to the SGI workstation and use the model <br />as the CRDSS BRM at this time. Current plans call for CRSS to be replaced with the new USBR model <br />when it is available. <br />2.0 DISCUSSION/ANALYSIS <br />Meetings conducted with the USBR as part of Task 1.11 have indicated that the USBR replacement for <br />CRSS will not be available until mid-1995. Although the USBR has stated that the SGI platform will be <br />among the first portings of the replacement model, the CRDSS schedule requires a prototype BRM to be <br />in place by the end of Year 1. Therefore, the decision was made to port the existing CRSS to the SGI <br />workstation to become the BRM prototype in Year 1. <br />The work to port CRSS occurred in several stages. The work began with a successful porting of the <br />model to a PC. The porting process was documented in five separate memoranda to the file. The <br />memoranda cover the following topics: General Porting Procedures for CRSS to a PC, CRSM Porting to <br />a PC, MHYDRO Porting to a PC, SMDID Porting to a PC, and TAPEDIT Porting to a PC. <br />In the next stage, RTi ported the PC CRSS code to the SGI workstation with the help of Ray Alvarado. <br />Most of the programs ported with only minor changes. Most of the input and output files were loaded <br />into the same directory location to simplify the structure of the response files. The GO.BAT files were <br />converted into scripts, as appropriate. <br />The programs will run from the CRDSS script or the graphical user interface (GUI). The sequence of <br />steps necessary to run the programs has not changed from the PC version. The user has the opportunity <br />to edit input, run the program, and view output for MHYDRO, SMDID, CRSM, and TAPEDIT. <br />1 <br />A275 01.09.95 1.12-1 Brazil <br />