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C"j 00 c.o '_.0' C: o conveyance systems. The first set of infrared aerial photographs were obtained in early April as water was being diverted into the canal system. The second was obtained in late September near the end of the irrigation season. Water and Salt Budgets During 1976, detailed data collected for the Reed Wa:,h study area were developed into annual preproject water and salt budgets (:figures 3 and 4), from the monthly data. These yearly data were extrapolated to the Stage One area (Figures 5 and 6) according to the following criteri.., 1. Reed Wash study area has 5,100 acres of irrigat,.d cropland as compared to 6;300 acres in the Stage One area. 2. Government Highline Canal outflows are the same for both areas. 3. Stage One lateral diversions are equal to Reed l,ash Government Highline lateral diversions plus Laterals 43 and 43 1/4 outside the Reed Wash study area. These two laterals have annual flows of 7,600 acre-feet as prorated from their respeetive capacities. 4. There are no exports or administrative spills from the Government Highline Canal in the Stage One Area. 5. Precipitation, ET, deep percolation, and inflow from above the Government Highline Canal were calculated on th,. basis of the ratio of irrigated areas. 6. Lateral and canal leakage as shown in Table 4. Proposed Additions to the Monitoring System The existing monitoring system and data are adequate for project construction, but a few additions could help clarify some items and make post construction effects easier to recognize. There will be more time for pre construction monitoring than was first programmed, so these additions could be in place in time to get base-line data. The weather data used in the calculation of consumptive use were extra- polated from the Grand Junction airport. Because of the localized micro- climate in the western end of the valley, a weather station in the Reed Wash 22