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<br />1937 <br /> <br />The reservoir gates are typically closed during November through March and all inflow is stored. Requests for res- <br /> <br />eervoir releases of stored water by downstream irrigators typically begin in the first 2 weeks of April and continue <br /> <br />episodically through October. Rainfall runoff that is generated upstream from the reservoir is noticeably anenuated <br /> <br />by storage in the reservoir. Streamflow between John Manin Reservoir and Lamar is substantially decreased by <br /> <br />irrigation diversions. <br /> <br />Specific conductance increases dramatically downstream from Pueblo (fig. 4). The downstream increase in <br /> <br />specific conductance is a function of discharge and the evaporative concentration of dissolved solids; specific con- <br /> <br />ductance \s inversely proportional to discharge. The median specific conductance increases downstream from 276 <br /> <br />llSlcm at Caiion City to 3.855 llSlcm at Lamar (fig. 4). Miles (1977) reponed that the majority of the salt loading to <br /> <br />the Arkansas River occurs between Canon City and Pueblo Reservoir and is caused by the dissolution of highly <br /> <br />saline sedimentary materials that are found in the reach. Downstream from Pueblo to Lamar, specific conductance <br /> <br />increases primarily because of the consumptive use of irrigation water and the concomitant increase in the concen- <br /> <br />.tration of dissolved-salts. The rate of increase in specific conductance is larger downstream from Catlin Dam (fig. <br /> <br />. 4) because irrigation rerum flow comprises a larger percentage of discharge in this reacb than it does upstream <br /> <br />from Catlin Dam. <br /> <br />Figure 4 Dear here. <br /> <br />,~~... <br />EPO"; i <br />d~;o.ilt.~'R .,...... <br />_~er, \W\\\"'ll"'t'\ l n"'\I\.~' <br /><;) r'l.... \.. ~ ~O l"'"G. <br />~ ,-~,' l' <br />.-. ~ ! ~ \ r'" ....~ <br />, . ..--.......-- <br />", .~'".' <br /> <br />. <br /> <br />17 <br />