Laserfiche WebLink
1 <br />Response to High Flows <br />' Twenty-two cross sections were surveyed in the study reach as part of the flooded ` <br />bottomlands project by FLO Engineering (1995b). There are some cross sections that are wide <br />and shallow, but most of the river channel is relatively narrow and deep. The average channel <br />1 width is 560 ft. During the high flow season, most of the river cross sections scoured during the <br />rising limb and peak flow and then refilled on the recessional limb. Three surveys of the 22 <br /> <br />1 <br /> <br />1 <br />1 <br /> <br />1 <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />cross sections in Canyonlands were conducted in 1995: Mid-April, mid-June and mid- <br />September. The cross section plots can be reviewed in FLO Engineering report (1995b). Out of <br />the 22 surveyed cross sections in the Canyonlands study reach, a total of 10 cross sections <br />experienced some fill, 5 cross sections displayed net scour and 7 cross sections were relatively <br />unchanged from spring to fall. The channel geometry in the study reaches adjusted to the <br />variable sediment load with thalweg shifts from one side of the river to the other, sand bar <br />development, thalweg scour to bedrock, and through variation in the cross section geometry. <br />4 <br /> <br />