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. .., ",050 n :,j ~J v) '- ~1 . of the gages is shown by the following equation: . San Juan River at Can-acas = San Juan at Fagosa Springs + Navajo River at Edith + Rio Blanco + Tributary Inflow . The sum of three upper gages have averaged approximately 369,000 acre-feet per year, and the tributary inflow between the upper gages and the Can-acas gage has averaged about 71,000 acre-feet per year. Monthly summaries of these flows for the study period are presented in Appendix B. . The tributary inflow was prorated between the Middle San Juan River basin (45.0%), the Lower Navajo River (45.2%), and the Lower San Juan River basin (9.8%) tributary segments based upon the tributary drainage basin size and mean basin elevation. Monthly summaries of these flows for the tributary segments during the study period are presented in Appendix E. . . San Juan River above Confluence with the Navajo River Historic flows of the San Juan River above the confluence with the Navajo River were estimated as the sum of the flows at the San Juan River at Fagosa Springs and Rio Blanco Below Blanco Diversion Dam gaging stations and the Middle San Juan River tributary inflows. These flows have averaged approxi- mately 324,600 acre-feet per year during the study period. Monthly summaries of these flows are presented in Appendix B. . . Navajo River at Mouth Historic flows of the Navajo River above the confuence with the San Juan River were estimated as the sum of the flows at the Navajo River at Edith gage and the Lower Navajo River tributary inflow. These flows have averaged about 108,800 acre-feet per year during the study period. Monthly summaries of these flows are presented in Appendix B. . -13- . ',~ ;,;.2;_