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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 />11 <br /> <br />entire study period of 1908 to 1984, Slight breaks in the slopes <br /> <br /> <br />of the single mass diagrams can be detected for droughts which <br /> <br /> <br />occurred in the 1930's, 1950's and 1970's. The flows it Canon <br /> <br /> <br />City provide an indication of the physical supply in the basin, <br /> <br /> <br />The gage is located above most of the significant water users in <br /> <br /> <br />the Arkansas River Basin, and a large portion of the water supply <br /> <br /> <br />in the basin originates from above Canon City. By comparing the <br /> <br /> <br />flows at other locations in the basin to the Canon City flows, it <br /> <br /> <br />can be determined whether flows at the other locations have <br /> <br /> <br />changed in relation to the available water supply in the basin, <br /> <br />The single-mass diagrams of usable stateline flows (set 1) show <br />the changes with time which have occurred, A noted increase in <br />the slope of the curve corresponds to the time when the Compact <br />was adopted in 1949. A noticeable flattening of the curve starts <br />in 1974 when usable stateline flows declined dramatically, It <br />should be noted from the diagrams that the change of the slope <br />starting in the 1970's is much more pronounced than those <br /> <br />corresponding to the droughts of the 1930's and 1950's, <br /> <br />The double-mass diagrams of Usable Stateline Flow vs. the Canon <br /> <br /> <br />City Adjusted Flows (set 9) show a slight increase in slope. indi- <br /> <br /> <br />cating an increase in usable stateline flows compared to Canon <br /> <br /> <br />City flows, starting in approximately 1949, This corresponds to <br /> <br /> <br />the time of the adoption of the Arkansas River Compact and <br />