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. T-, Associated Programs Programs auociated with the river'basin simulation model are .summarized in this section in the order of use for a complete study. 1. Data Analysis Programs. These programs are used to analyze historic data if hydrology inputs 'to the simulation model 'are to be syn- thetically generated. These programs do time series analysis and re_ moval 01 cyc1istic ~omponent&. analysis of probability distributions. and multiple regression analysis. Coefficients are computed which are input to the synthetic hydrology generation program. 2. Synthetic Hydrology Generation Program. This program uses the coelficients prepared in the data analysis sequence and recreates a. streamflow sequence ready for input to the river basin simulation model. 3. Simulation Model Demand Input Da.ta Program. This program takes demand data in a detailed "user" form, summarizes it into ,any of 6.e.veral report type' forma for easy examination and report presentation. and accummulates "user" data into a composite value for a demand sequence point and in the required fOTmat for input to the TiveT basin simulation model. 4. River Basin Simulation Model~ This program uses hydrology, demand. and reservoir operational inputs, all based on a node-sequence point configuration to compute flows in the mainstream of the badn~ Spec;ial features of the Colorado River operation are included as special subroutines. A variety of output options are available to {it the user's n~eds. s. Tape Edit Program. This program analyzes a special output disk file from the simulation model run if it has been written. A variety of parameters can be printed, punched on ~ards, or plotted on micro- film. 15B rosr . Example Model Run Results Results of one series of model runs are included lor illustrative purposes. These runs used demand inputs (rom the Westwide Studies, with some modifications. These demands totaled 3.0 million acre-feet (3,100.50 million cubic meters) depletion in the Upper Basin in 1970 and increased to 5.5 million acre-feet (6,784.2 million cubic meters) in year 2000. Lower Basin demands totaled 6. 1 million acre-feet (7,524.4 million cubic meters) in 1970 and increased to 7.5 million acre-feet (9.251. 2 million cubic meters) in 1988 and remained at 7.5 million there alter. Table 2 is an example ol the .summary ol annual values (II flow and salinity at selected stations' for 1 of 30 hydrologic traces. Flows arc 1n .1. 000 acre-Ieet increments and salinity is in milligrams per liter (1,000 acre~leet x!. 2335;:; million cubic meters). .1 ..1 :j Typical Model Run Costs The river basin simulation model is presently set up to run on the Bureau of Reclamat.ion's Control Data Corporation CYBER 701 Model 74-28 computeT at the Engineering and Research Center, Denver, Colorado. The model requires 150,000 octal words ol storage. A typica~ breakdown of central processer unit time used Jo~ major functions in the model is shown in Table 3. This time breakdown re- lates to one 26-year run which printed only the summary table of annual . values o{ flows and salinity at the selected stations. Simulation model costs associated with several typical r'uns are shown in Table 4. These costs vary with the amount and type olout.. put desired. When synthetic hydrology data are used, one trace is generated at a time and ~ll sUs of d~ma.nd data are run thruugh th~ model before going to the next hydrologic trace. Generation costs are thus reduced. ~i I j I ~ 159 ?~ "