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Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River
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Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River
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Last modified
9/21/2012 11:54:41 AM
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9/21/2012 11:35:54 AM
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Water Supply Protection
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Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River
State
CO
Author
Lewis, Michael; Brendle, Daniel
Title
Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River
Water Supply Pro - Doc Type
Report/Study
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lr 4,500 <br />W <br />H <br />W <br />4,000 <br />z <br />W <br />U <br />C[ 3,500 <br />W <br />a- <br />U7 <br />W Z) 3,000 <br />W J <br />W <br />0 U) 2,500 <br />UW <br />_ W <br />�cc <br />Z W 2,000 <br />U N <br />Fa- Q 1,500 <br />U <br />0 1,000 <br />U <br />U_ <br />!�- 500 <br />U <br />W <br />CL <br />0 <br />E <br />m <br />J <br />300 250 200 150 100 50 <br />RIVER MILES UPSTREAM FROM THE COLORADO - KANSAS STATE LINE <br />Figure 4. Median specific conductance at selected sites on the Arkansas River, 1990 -93. <br />flow when natural base flow was supplemented by <br />reservoir releases in the upper basin. Daily mean <br />streamflow decreased significantly in July, August, <br />and September (table 2). <br />The monthly streamflow trends probably were <br />caused by differences in the quantity of imported <br />western-slope water for the two periods of analysis. <br />The transmountain importation of Colorado River <br />Basin water into the Arkansas River Basin has <br />occurred since the late 1800's. The imported water has <br />been used to meet mining, agricultural, municipal, and <br />industrial water needs. Some of the imported water <br />is diverted directly into the main stem of the upper <br />Arkansas River, and some of the water is diverted out <br />of the upper basin via closed conduit flow. During <br />1964 -74, prior to the completion of Pueblo Reservoir, <br />the median annual volume of water that was imported <br />into the Arkansas River Basin and released to the river <br />was about 62,900 acre -ft (fig. 6). The median annual <br />volume of imported water increased significantly <br />(p =0.01) to about 103,000 acre -ft during 1975 -94 <br />(fig. 6). These values do not include the water that was <br />diverted out of the basin via closed conduit flow. The <br />increase in transmountain water is attributable to <br />the Fryingpan - Arkansas Project importations, which <br />began in 1972. The increased importation of western- <br />slope water and the release of this water from storage <br />during otherwise low -flow months probably accounts <br />for the increase in streamflow at Canon City during <br />October —April. Water is released from upper basin <br />storage in the winter to create storage space for addi- <br />tional transmountain imports during the coming snow - <br />melt runoff season. There were insufficient data for a <br />historical analysis of monthly trends in the amount of <br />transmountain water that has been released to the <br />Arkansas River. <br />Although there is a 13 -year gap (1977 -89) in <br />the specific - conductance record, the data do provide <br />some important information about the quality of <br />water that entered the lower basin before and after <br />the construction of Pueblo Reservoir. A visual assess- <br />ment of the data indicates that the range of specific- <br />conductance values (130 -380 µS /cm) was relatively <br />constant during 1964 -94 (fig. 7). The median <br />specific conductance decreased about 19 percent <br />from 307 gS /cm in 1964 -74 to 250 gS /cm in 1975 -94. <br />12 Relations of Streamflow and Specific- Conductance Trends to Reservoir Operations in the Lower Arkansas River, <br />Southeastern Colorado <br />
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