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DOD378 . Water Requirements in New Mexico," New Mexico State Engineer - Techni- cal Report 32, 1965. The net potential consumptive use of alluvial ground- water, corrected for effective precipitation, was estimated and is summa- rized below: Reach West, Middle & East Mancos Rivers to Weber Canyon Net Potential Consumptive Use (ac-ft! ac ) Area ( acres) Potential Stream Loss (ac-ft!yr ) 3.2 280 900 Weber Canyon to Navajo Canyon 3.4 520 1,800 Navajo Canyon to Highway 666 3.5 590 2,100 Highway 666 to Aztec Wash 3.6 690 2,500 Totals 2,080 7,300 Johnson Canyon to Highway 666 3.5 800 2,800 . C. Estimated Stream Losses. Stream losses for the reach between Johnson Canyon and Highway 666 were estimated by two separate methods as described above. In the first method, a comparison was made between gaged flows at Johnson Canyon versus gaged flows at Highway 666. By this method it appears that the average stream loss is about 2,100 acre-feet per year. Tributary inflow between the two gages may have been significant during the spring months, resulting in a stream loss estimate that is too low. In the second method, evapotranspiration losses were estimated through use of aerial photographs of the riparian phreatophyte areas, together with calculations of potential consumptive use by the phreatophytes. By this method, the stream loss for this reach was estimated to be 2,800 acre-feet per year. The use of potential consumptive use calculations . -32- j; _'c.