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<br />., <br /> <br />. <br /> <br />. <br /> <br />2003 <br /> <br />. <br /> <br />Streamflow in the upper Arkansas River exhibits large seasonal variability and can be separated into four dis- <br /> <br /> <br />tinct seasonal now regimes: low now (October-March), pre-snowmelt runoff (April), snowmelt runoff (May-June), <br /> <br /> <br />and post-snowmelt runoff (July-September) (Figure 2). During the low-flow period in October through March, <br /> <br /> <br />streamflow is relatively small and is maintained by natural baseflow and reservoir releases. During pre-snowmelt <br /> <br /> <br />runoff in April, reservoir releases decrease slightly and snowmelt runoff commences. During snowmelt runoff in <br /> <br />May and June, streamflow is at its annual maximum and increases substantially in the downstream direction because <br /> <br />of reservoir releases and tributary inflow. The post-snowmelt runoff season in July through September includes the <br /> <br />receding limb of the snowmelt runoff hydrograph in July and a period dominated by releases of stored water from <br /> <br />Twin Lakes Reservoir in August and September. The impact of tributary contributions from Lake Creek are clearly <br /> <br />visible during all four seasonal flow regimes (Figure 2). <br /> <br />Figure 2 near here. <br /> <br />5 <br />