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An analysis of the range of hydrologic conditions was performed by fitting a trend (best- <br />fit) line to cumulative annual flows for each indicator gage. Significant differences in the <br />slope of the cumulative flows relative to the slope of the trend line indicate wet periods <br />(steeper slope) and dry periods (flatter slope). An example of the hydrologic condition <br />analysis based on cumulative streamflow is presented on Figures 3 and 4. The <br />cumulative streamflow plot presented for the North Platte River near Northgate, similar <br />to the other indicator stations, shows that the selected study period includes extended <br />periods of wet, dry, and average hydrologic conditions. <br />Figure 3 <br />Example of Cumulative streamflow <br />North Platte River Near Northgate (06620000) 1950 - 1975 <br />8,000 <br />7,000 <br />6,000 <br />~, 5,000 <br />v <br />v <br />v <br />4,000 <br />0 <br />0 <br />0 <br />3,000 <br />2,000 <br />1,000 <br /> <br /> Ave <br /> <br /> Dry <br /> Ave <br /> Wet <br />Ave <br /> <br />i°n ~ c°o coo ° ~ <br />rn rn rn rn rn rn <br />Year <br />Page 9 of 21 <br />