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PROCEDURES A set of CRSS historic hydrologic flows (1933-1974) was subjectively selected and used in evaluation of precipitation enhancement data. This set was run through CRSS simulation, including flows from precipitation enhancement, and data were compared to the flows without precipitation enhancement. Reduction of shortages, flows to Mexico, changes in sal inity, flow response, reservoir response, increased power production, and associated revenues were then eval uated. Flows were exami ned for an Upper Bas inwidE! operational weather modification program period of 1991 to 2020. The numerical source used in establishing the increment of increase in runoff from weather modification was the TBWMOD (Twelve Basin Investigation Micr'o- physical and Convective Estimates). This source provided a medium incrernen- tal increase in flow in the Colorado River System. Figure 1 illustrates the principal cloud seeding areas in the Colorado River Basin which are under examination. The Mogollon Massif in the Lower Co'lClrado River Basin was not examined in this effort. Only flow inside the Colorado River Basin was examined in this study. The numbers associated with each area in figure 1 indicate the estimated yearly increase in flow from weather modification based on the total of 1622 x 106 cubic meters (1 315 000 acre- feet) from TBWMOD in the Upper Colorado River Basin. There is no streamflow gage at the Lee Ferry Compact point which is the dividing point between the Upper Basin and Lower Basin, as defined in the Colorado River Compact 19~~2. Flow is computed as the sum of flow at stations on the Colorado River and Paria River at Lees Ferry. Figure 2 depicts the block diagram for the entire River Basin Simulation System. It was necessary to adjust the Hydrology Data Base for the Color'ado River Basin with the anticipated changes from weather modification befoq! input into the actual CRSM (Colorado River Simulation Model). In CRSS the Basin is separated into various reaches or subbasins which hereinafter are called nodes. These nodes are then further developed into individual points at which inflows of water, demands on water, and reservoirs are located. For the Colorado River Basin, each of the 22 nodes represents a specific geographic area. Up to 10 inflows and 10 different demands (vari- ables) can be identified within each node. Based on projected time/watey' demands relationships made for each demand point, the impact on system \'Iater supply and quality can be analyzed. Demands input into the model were Py'o- vided by Regional Representatives of the Water and Power Resources Service. In the Upper Basin, each demand generally represents one of the followin~1 functions: 1. Present level use 2. Agriculture 3. Municipal and industrial use 4. Export s 2