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<br />. <br /> <br />observed peak discharges to total flood volumes are extremely <br /> <br /> <br />high. Residents of the basin have stated that the upstream portion <br /> <br /> <br />of the basin is the flood-producing portion of the drainage area. <br /> <br /> <br />The range in difference of topography and soil types found in <br /> <br /> <br />the upstream and downstream portions of the area tends to support <br /> <br /> <br />this observation. The steeper slopes and clay-type soils of the <br /> <br /> <br />upstream portion of the basin concentrate runoff more rapidly and <br /> <br /> <br />have lower infiltration rates than the flatter topography and <br /> <br /> <br />sandier soils found in the downstream portion of the area. <br /> <br />Streamflow. Streamflow in the Bijou Creek basin follows a <br /> <br /> <br />pattern of long periods of zero flow interrupted occasionally by <br /> <br />runoff from rainstorms. From 1950 to 1956, the average annual <br /> <br /> <br />runoff from the 1,370 square mile area lying upstream from Wiggins <br /> <br /> <br />gaging station was only 0.09 inch. The flow records from the <br /> <br /> <br />Wiggins station are summarized in table 9. These data indicate <br /> <br /> <br />the extreme range of flow that has been experienced in the Bijou <br /> <br /> <br />Creek basin. <br /> <br />Table 9 <br />Wiggins Gaging Station Data <br /> <br />Water Maximum Flows Minimum Flows <br />Year Date Discharge Date Discharge <br /> (c.f.s,) (c.f.s.) <br />1935 31 May 280,000* <br />1950** 31 Jul 767 most of year 0 <br />1951 3 Aug 50,100 most of year 0 <br />1952 22 Aug 7,840 most of year 0 <br />1953 30 Jul 1,080 most of year 0 <br />1954 30 Ju1 5,700 most of year 0 <br />1955 28 Aug 2,450 most of year 0 <br />1956 31 Jul 19,000 most of year 0 <br />1965 18 June 466,000* <br />* Slope area estimate <br />** Record begins in April <br /> <br />. <br /> <br />52 <br />