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<br />. <br /> <br />. <br /> <br />. <br /> <br />1944 <br /> <br />decreased to about I percent at station 07099400, 4.3 percent at the Pueblo Board of Water Works diversion, and <br /> <br />27 percent at the St. Charles Mesa Water District diversion point (fig. 12). These results indicate that the chemical <br /> <br />quality of the Arkansas River. in terms of specific conductance and dissolved solids concentration. has improved <br /> <br />in the 9-mi reach between Pueblo Reservoir and the St. Charles Mesa Water District diversion since 1975, when <br /> <br />Pueblo Reservoir was completed. The improved quality of water is attributable to two factors: (I) decreased spe- <br /> <br />cific conductance in the upper Arkansas River, because of the increased importation of Colorado River Basin <br /> <br />water; and (2) dilution of elevated specific-conductance reservoir inflow during low-flow periods, which is caused <br /> <br />by the mixing of elevated specific-conductance water with low specific-conductance water within Pueblo Reser- <br /> <br />voir. <br /> <br />Figure 12 near here. <br /> <br />-~~... <br />E.pO".~ \. . <br />li>.i",,~'i 'f\ C\n~ <br />. cL\'N\~\'1" 0 R~\J\.-'- ".- <br />\pH... '-:C1' l' - <br />~ueJt;;. <br />'-- <br /> <br />24 <br />