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<br /> 1500 <br /> 1400 <br />0 1300 <br />Z <br />0 1200 <br />U <br />W <br />V1 1100 <br />cr <br />W 1000 <br />0- <br />f- 900 <br />W <br />W <br />"- BOO <br />U <br />m 700 <br />::J <br />U <br />~ 600 <br />W- 500 <br />19 <br />cr <br /><t 400 <br />I <br />U 300 <br />V1 <br />is <br /> 200 <br /> 100 <br /> 0 <br /> 1920 1925 1930 1935 1940 1945 1950 1955 1960 1965 <br /> <br /> <br />1970 1975 19BO 19B5 <br /> <br />Figure 93.--Annual mean discharge for the Arkansas River <br />near the Colorado-Kansas State line. <br /> <br />The average discharge in the Arkansas River generally increases until <br />just downstream from Pueblo. This increase, due to contributing tributaries <br />and transmountain imports, exceeds irrigation diversions. Downstream from <br />Pueblo, irrigation diversions far exceed tributary inflow, and discharge in <br />the river decreases. This change in streamflow is illustrated on figure 94, <br />where the average discharge during each decade within the period 1921-80 at <br />streamflow-gaging stations is plotted at the station's location along the <br />river. <br /> <br />Runoff is expressed in this report in units of depth (in inches per <br />month)--that is, discharge divided by drainage area and time. Comparing <br />runoff from one station to another removes the complexity of differing <br />drainage areas. Six stations were selected to characterize the runoff within <br />the basin representing different physiographic and hydrologic locations. <br /> <br />The frequency-distribution curves in figure 95 illustrate the probability <br />of the monthly runoff being equal to or greater than specified values during <br />any month. A curve with a steeper slope defines more month-to-month <br />variation. The seasonal distribution of that variation is shown in figure 96, <br />which presents the mean, maximum, and minimum monthly runoff, and a band of <br />one standard deviation about the mean. <br /> <br />60 <br />