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I I I I I I I I I I I I I I I I I I I 002572 39 VI. IMPLEMENTATION A. Availability of system model The system model was developed using the UNIX Prelude Spreadsheet Program. This program should be available on all soil conservation service UNIX computer systems. To use this program, the fOllowing data is needed: Monthly water supply values, including direct diversion, reservoir releases, and groundwater pumped. Conveyance efficiency of the distribution system and percent of flows which returns to the river as surface flows. Area irrigation. crop distribution. On-farm irrigation efficiencies. Percent of return flows which go to deep percolation. Quality of the surface and groundwater. Area of phreatophytes and ET rates for the phreatophytes. crop irrigation requirements. copies of the base water budget can be obtained from the Colorado state Office of the Soil conservation service. Availability of the river model. Copies of the Soil Conservation service version of the USGS Arkansas River Model can be obtained from the Colorado State Office. The FORTRAN program code and the compiled program is available. To run this model, a 386 or higher DOS computer system with at least eight meg of memory is needed. In addition, LAYHEY 77 FORTRAN must be loaded on the system. copies of the USGS input files required to run the model are available. B. Other data needs To justify project action in any of the irrigation systems studied, additional information will be needed. The river model indicates that irrigation improvements will make