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<br />. <br /> <br />fHin9~,8 <br /> <br />. <br /> <br />River at Edith near the Colorado-New Mexico State line have averaged 77,000 <br /> <br />acre-feet per year. On the San Juan River at Pagosa Springs, flows have averaged <br /> <br /> <br />246,000 acre-feet per year. <br /> <br />. <br /> <br />. <br /> <br />The historic river flows on the San Juan River and its tributaries reflect <br /> <br /> <br />the effects of diversions for in-basin irrigation, transbasin diversions, municipal <br /> <br /> <br />water use, and reservoir evaporation. The difference between the virgin flow <br /> <br /> <br />and the historic flow of the river is due to the depletions of the river associated <br /> <br /> <br />with the works of man. These depletions have averaged about 56,000 acre-feet <br /> <br /> <br />per year for the San Juan River upstream from the inlet to Navajo Reservoir. <br /> <br />Calculated virgin flows for locations of interest are summarized in the following <br /> <br />table: <br /> <br />. <br /> <br />Calculated Annual Virgin Streamflow <br />(Values in 1,000 Acre-Feet) <br /> <br />. <br /> <br />Average Maximum Minimum <br /> <br />. <br /> <br />San Juan River <br />above Navajo Reservoir 495.8 944.3 186.4 <br />San Juan River <br />above Mouth of Navajo River 355.9 688.0 139.8 <br />Navajo River <br />at Mouth 133.2 247.1 48.0 <br /> <br />-,'<- -,",'- <br /> <br />. <br /> <br />This reportincludesil description of the"methodology' used in' extending <br /> <br /> <br />incomplete historic records of streamflow, and in calculating the virgin flow <br /> <br />of the San Juan River and its tributaries above Navajo Reservoir. Summaries <br /> <br /> <br />of data used in the analysis are included. <br /> <br />. <br /> <br />. <br /> <br />-2- <br /> <br />. <br /> <br />. <br />