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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />10 <br /> <br />change of one quantity in relation to the other can be estimated <br /> <br /> <br />by using the slopes of the diagram, The actual accumulated flows <br /> <br /> <br />over a specified period of interest of changed slope can be com- <br /> <br /> <br />pared to the projected accumulation which would occur using the <br /> <br /> <br />original slope, The difference between the actual and projected <br /> <br /> <br />accumulation provides an estimate of the quantity of change indi- <br /> <br /> <br />cated by a Change in slope of the diagram, <br /> <br />There are several periods which are considered significant for <br /> <br /> <br />this analysis, The diagrams generally show changes starting in <br /> <br /> <br />1949 and 1974, The Arkansas River Compact was ratified in 1949 <br /> <br /> <br />and the changes to the regime of the river caused by the Compact <br /> <br /> <br />are apparent in viewing the curves, Most of the diagrams show a <br /> <br /> <br />break in slope in 1949, A second break in slope generally occurs <br /> <br /> <br />for the diagrams of stateline usable flow starting in the early <br /> <br /> <br />1970's, An analysis of the diagrams and streamflow records indi- <br /> <br /> <br />cates a noticeable change in slope of the curves starting in about <br /> <br /> <br />1974. For that reason, the 1974-1984 period has been considered <br /> <br /> <br />separately for comparison with the slopes derived for pre~compact <br />and 1949-197. post-compact periods. Slopes have been computed for <br />selected diagrams for these three periods, Several aspects of the <br />diagrams are discussed below: <br /> <br />The single-mass diagrams of the Canon City adjusted flow (set 8, <br /> <br /> <br />referenced in Table 1) indicate a fairly consistent slope for the <br />