Middle Channel Sand Bar Relocation February 15
Current Opened Gate: All gates fully opened.
All gates were fully opened
(lowered) on 15-Feb (the end of the gate trial operation task 2) as shown in
figure 1. Channel bed elevation survey
(figure 2) and aerial photo (photo will be posted soon) were conducted. Water depth was decreased 1.64 ft, and
getting slightly increased later following the USGS hydrograph (green
circle). Flow rate was approximately 530
cfs according to the USGS gage (08329928, at Paseo Del Norte).
Many sand bars were showed
up even at the upstream (figure 3), and water depth in the fish passage was
significantly decreased (figure 4). Sand
bar (sediment deposition) is existed between two vegetated islands (red circle
in figure 5). It can give effect on the
west channel downstream flows and gate operations.
Figure 1 [EB6] Figure
2 Figure 4 [FP1]
Figure
3
Figure 5 [location map]