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Table 4. Step -trend results on the daily mean streamflow at station 07099400 (Arkansas River above Pueblo) between <br />1966 -74 and 1975-94 <br />[ft3 /s, cubic feet per second; N, number of values; p value is the significance level of the test; <, less than; NS, trend not statistically significant; <br />I, statistically significant increasing trend; D, statistically significant decreasing trend] <br />M 1,000 <br />W <br />F_ <br />2 <br />F' 900 <br />z <br />U.1 <br />U <br />M <br />CL 800 <br />U) to <br />Z <br />W — <br />!L1 <br />J 700 <br />OU <br />Cr W <br />w <br />U Cr 600 <br />Z W <br />-0 <br />Lu U N 500 <br />Z <br />I— Q <br />U <br />Z) 400 <br />0 <br />Z <br />O <br />U <br />U 300 <br />CE <br />U <br />W <br />a- 200 <br />U) <br />1966 -74 <br />1975 -94 <br />Month <br />Median <br />Median <br />p value <br />Significances <br />streamflow <br />N <br />streamflow <br />N <br />• <br />(ft3/s) <br />(ft%) <br />• <br />January <br />300 <br />279 <br />112 <br />620 <br /><0.01 <br />D <br />February <br />245 <br />252 <br />175 <br />560 <br /><.01 <br />D <br />March <br />164 <br />279 <br />271 <br />620 <br /><.01 <br />I <br />April <br />237 <br />270 <br />418 <br />600 <br /><.01 <br />I <br />May <br />824 <br />279 <br />806 <br />620 <br />.03 <br />D <br />June <br />1,625 <br />270 <br />2,120 <br />600 <br /><01 <br />I <br />July <br />1,160 <br />279 <br />1,460 <br />620 <br /><01 <br />I <br />August <br />867 <br />279 <br />866 <br />620 <br />.16 <br />NS <br />September <br />326 <br />270 <br />400 <br />600 <br /><01 <br />I <br />October <br />202 <br />279 <br />320 <br />620 <br /><01 <br />I <br />November <br />283 <br />270 <br />201 <br />600 <br /><.01 <br />D <br />December <br />315 <br />279 <br />107 <br />620 <br /><01 <br />D <br />to statistically <br />significant trend was defined as having a p value less than or equal to 0.05. <br />1.100 <br />M 1,000 <br />W <br />F_ <br />2 <br />F' 900 <br />z <br />U.1 <br />U <br />M <br />CL 800 <br />U) to <br />Z <br />W — <br />!L1 <br />J 700 <br />OU <br />Cr W <br />w <br />U Cr 600 <br />Z W <br />-0 <br />Lu U N 500 <br />Z <br />I— Q <br />U <br />Z) 400 <br />0 <br />Z <br />O <br />U <br />U 300 <br />CE <br />U <br />W <br />a- 200 <br />U) <br />/ COMPLETION OF PUEBLO RESERVOIR <br />• <br />• <br />• • • • • <br />90 0 <br />1 <br />• • • • <br />• <br />• • <br />. • <br />100 <br />1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 <br />Figure 10. Specific conductance at station 07099400 (Arkansas River above Pueblo), 1966 -94. <br />RELATIONS OF STREAMFLOW AND SPECIFIC - CONDUCTANCE TRENDS TO RESERVOIR OPERATIONS 19 <br />IN THE ARKANSAS RIVER <br />• <br />• <br />• <br />• <br />T . <br />� <br />r <br />/ COMPLETION OF PUEBLO RESERVOIR <br />• <br />• <br />• • • • • <br />90 0 <br />1 <br />• • • • <br />• <br />• • <br />. • <br />100 <br />1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 <br />Figure 10. Specific conductance at station 07099400 (Arkansas River above Pueblo), 1966 -94. <br />RELATIONS OF STREAMFLOW AND SPECIFIC - CONDUCTANCE TRENDS TO RESERVOIR OPERATIONS 19 <br />IN THE ARKANSAS RIVER <br />