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I I I I I I I I I I I ,,", '''':\ r ".." :i4';;U SECTION II - EFFECTS OF RUEDI RESERVOIR EFFECTS ON RIVER FLOWS Table 1, "Ruedi Reservoir'Operation and Downstream Discharges Without Water Sales for Water Years 1976-1978", shows the base conditions and the effects of Ruedi reservoir operation on flows in the Fryingpan River. Columns 6, 7 and 9 compare flows on the Fryingpan at the Ruedi gaging station with and without the reservoir. Columns 8(a), 8(b), and 8(c) show actual releases from Ruedi Reservoir including the fish bypass release and releases for other purposes, primarily to provide space for flood control storage. Col- umns 10 and 11 compare measured flows downstream from the reservoir on the Roaring Fork and Colorado Rivers. For the most part, flows were maintained at or above the minimum levels except during the late summer of 1977. EFFECTS ON DISSOLVED SOLIDS Table 2 shows total dissolved solids (TDS) and conductivity at various points upstream and downstream from Ruedi Reservoir and on the Colorado River. United States Geological Survey (USGS) TDS measurements were only available for the Colorado River gaging stations. USGS conductivity data were available, however, for stations on the Colorado, Roaring Fork and Fry- ingpan Rivers. An average relationship between TDS and conductivity was developed for those stations having both data sets. This relationship was then used to estimate TDS at those stations having only conductivity data. Conductivities were also adjusted for temperature variations by increasing or decreasing conductivity by 2 percent for each degree (Celsius) of in- crease or decrease in temperature. The following qualifications should be considered concerning the total dis- solved solids data: (1) The conductivity and TDS data are point values and are not monthly averages. (2) Conductivity is dependent on composition of the total dissolved solids which may vary with time and location. Therefore, the TDS estimates based on conductivity may vary somewhat from actual TDS levels in the river. The same variation can exist with the tempera- ture conversion. (5)