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I I I I I I I I I I I I I II I I I I I I 002545 12 diversion, reservoir water, intercept water from other canal systems, and pump water. conveyance system losses are accounted for by applying a conveyance system efficiency and on-farm losses are determined by an on-farm irrigation efficiency. salinity values included in the input and output data pertain to return flows and groundwater recharges. The location of return flows in relation to Pueblo Reservoir is the main factor in the water quality equation. The references used to assign these salinity levels are: (1) "Quality of the Arkansas River and Irrigation Return Flows in the Lower Arkansas River Valley, Colorado" (Water Resource Investigation Report 84-4273) by U. S. Geological survey; and (2) "Relations of Specific Conductance to Streamflow and Selected Water Quality Characteristics of the Arkansas River Basin, Colorado" (Water Resource Investigation Report 87-040-41) by U. S. Geological Survey. The salinity levels, as determined above, were simply related to volumes of return flow and groundwater recharge to obtain tons of salt. crop consumptive use, surface return flows, and groundwater recharge are computed in the spreadsheet. Figure 3 is a graphic illustration of the water budget accounting. Table 3 is a sample of the spreadsheet for a selected canal system. A glossary of terms is also included for clarification of terms used in the water budget. It should be noted that a provision is made in the spreadsheet for intercept water. This item of input data is significant only for those canals previously listed in groups. Canal system spreadsheets within each group are linked together so that a portion of return flows from one canal may be a water supply to an adjacent system. This feature has a significant impact on crop consumptive use and return flows to the river.