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<br />';-, ,\I .,... .~... <br />..o~ :) <br /> <br />- <br /> <br />78 6C <br />o AUGUST 1987 <br /> <br />SITES <br />5C 48 <br /> <br />3B 2B 18 <br /> <br /> <br />W 10 <br />u 20 <br />" 350 <br />~ <br />"' 30 <br />" <br />V> 40 <br />"' <br />6 50 <br />~ t;:j 60 <br />:J.:~ 70 <br />~ ~ 80 <br />;: 90 <br />0 <br />~ 100 <br />w <br />'" <br />I 110 <br />e- 120 <br /><L <br />W <br />0 130 <br /> 140 <br /> 0 OCTOBER 1987 <br /> <br />............. RESERVOIR <br />BOTTOM <br /> <br />w' 10 <br />U <br />" 20 <br />~ <br />~ 30 <br />V> '0 <br />"' <br />6 50 <br />~t;:j 60 <br />:J.: ~ 70 <br />~~ 80 <br />;: 90 <br />o <br />~. 100 <br />'" <br />:c 110 <br />t 120 <br />w <br />o 130 <br />1400 <br /> <br /> <br />............ RESERVOIR <br />BOTTOM <br /> <br />23456789 <br />APPROXIMATE DISTANCE UPSTREAM FROM <br />DAM, IN MILES <br /> <br />SITES <br />78 6C 5C 48 <br />SEPTEMBER 1987 <br /> <br />3B 2B <br /> <br />1B <br /> <br /> <br />............ RESERVOIR <br />BOTTOM <br /> <br />o 2 3 4 5 6 7 8 9 10 <br />APPROXIMATE DISTANCE UPSTREAM FROM <br />DAM, IN MilES <br /> <br />EXPLANATION <br />-400- LINE OF EQUAL SPECIFIC CONDUCTANCE <br />-Number is specific conductance in <br />microsiemens per centimeter. Contour <br />interval is 50 microsiemens per centimeter. <br /> <br />10 <br /> <br />Figure 5. Monthly specific-conductance profiles for Pueblo Reservoir, December 1986 and March through <br />October 1987 --Continued. <br /> <br />ification, underflow, and large reservoir outflow rales <br />from about May to September, the actual residence <br />times of a portion of the reservoir water are consider- <br />ably shorter than the theoretical residence time, These <br />conditions result in less mixing and dilution of the res- <br />ervoir inflow before being discharged at the dam. The <br />conditions that result in shorter residence times for <br />inflowing water also can result in longer residence <br />times for a portion of reservoir water. The water with <br />longer residence times might be prevented from mixing <br />with the underflowing water by strong thennal stratifi- <br />cation. <br /> <br />Daily reservoir inflow and outflow specific- <br />conductance measurements made during ]986 and <br />1987 were used to estimate the minimum residence <br />times for the reservoir during these years and to indi- <br /> <br />cate the potential effect of underflow on reservoir resi- <br />dence times. The minimum residence time was <br />estimated as the elapsed time between the observed <br />minimum specific conductance of the reservoir inflow <br />and outflow (fig, 7), This method could not be effec- <br />tively applied to 1985, 1988, or 1989 data because of <br />missing data or anomalous patterns in the specific- <br />conductance data. ]n 1986, the minimum residence <br />time was about 30 days and occurred from June 23 to <br />July 22. The minimum residence time in 1987 was <br />about 31 days and occurred from June 6to July 6. The <br />residence times associated with these periods of under- <br />flow in 1986 and 1987 represent decreases in the theo- <br />retical residence times of about 33 percent and about <br />31 percent, respectively, <br /> <br />PHYSICAL CHARACTERISTICS 17 <br />