. Bulletin. Natural history; Natural history. Aug. 1981 Brigham: Water Quauty 311 result of continuous operation as had oc- curred during the comparable time period in 1974. Finally, in late July 1976 heat additions to Lake Sangchris were stopped for the remainder of the summer. Since May 1975 then, the thermal patterns in Lake Sangchris have been disrupted as a result of the off-on nature of plant operation, as illustrated by the 1°C line. The 1 °C line (separating the areas greater than from those less than 1 °C above intake water temperature) moves from Station 5 in November 1975 to Station
. Bulletin. Natural history; Natural history. Aug. 1981 Brigham: Water Quauty 311 result of continuous operation as had oc- curred during the comparable time period in 1974. Finally, in late July 1976 heat additions to Lake Sangchris were stopped for the remainder of the summer. Since May 1975 then, the thermal patterns in Lake Sangchris have been disrupted as a result of the off-on nature of plant operation, as illustrated by the 1°C line. The 1 °C line (separating the areas greater than from those less than 1 °C above intake water temperature) moves from Station 5 in November 1975 to Station 2 by late November 1975 and back to Station 5 by late Feburary 1976. It bounces back and forth around the entire cooling loop, reflecting the interrupted nature of plant operation. Data interpretation during this period for any thermal effect would be very difficult. Linear regressions with confidence intervals were calculated for the mean water temperature at each station (Y) against the mean intake water temperature (X) for the period September 1973 through August 1976 to determine whether there was any predictive value in the data. Could the water temperature at the plant intake be related to ambient water temperature? Table 8 summarizes the equations derived from the linear regressions of mean water temperatures from stations 2 through 7 on that at Station 1. Fig. 6 illustrates the slopes and intercepts of the lines derived for the cooling-loop stations. Proceeding around the cooling loop from plant intake to plant discharge, the observed water temperatures become less dependent upon intake or "ambient" Table 8.—Equations derived from linear regressions of mean water temperatures (°C) at stations 2 through 7 on the mean water temperature at Station 1. SLOPE Stations Sept. 1973-AuK. 1976 1&2 1&3 l&A 1&4 l&B 1&5 1&7 Y = -1- Y = -f Y = -1- Y = + Y = -1- y =
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