Dredge Report, June 16, 2011

Friday, June 16, 2011

At 7:30 Karen left in the flat boat while Timmy stayed at the camp for other duties. The replacement winch was waiting at Grainger’s in New Iberia at the promised 9am time. The next stop was at Voorhies to pick up a new engine rain-flap and a big wrench to use on the hydraulic fixtures. She tried to pick up hydraulic fluid but they didn’t carry the necessary kind. She made it back to camp by 10:30am.

By 11:30, Timmy and Karen were on the dredge to install the new winch and make a few improvements to the arrangement of the hoses attached to the pump. Timmy was able to start dredging again at noon. Karen explored the progress of mud accumulation in cell 5 and took pictures, and added to containment to fill in the low part. We left the pirogue in the cell and use the canoe to get back and forth so that we don’t have to drag a boat across the marsh or containment to access the cell.

Timmy installing new winch(Left). Canoe on the pond side and pirogue in cell5(Right).

A total of 14 hours of dredging has filled the east end of Cell 5 full of fluid mud to the current water level. The water level is at the band below the green mark – I’m still not sure what the colors stand for. Karen had to use two poles like ski poles to push the pirogue around. Two mounds are above the current water level – the one to the south is from the first 6 hours, and the nice delta around the float is from the remaining 8 hours. The day-old mud has turned a nice beige color and the new material appears dark gray. The mud has not made it to the far reach of the inlet through the thick SAV and you can still see the settling pan at the base of the pole at that location. A shelf is being formed along the marsh edge. The mud is at the water line and the paddle leaves mounds behind at each push. The current “delta” is not only in front of the discharge, but is building nice lobes behind it as well.

The small containment seems to be doing a good job of straining water, and the water level appears 1-2 inches higher in the cell than the pond. The larger containment is obviously passing more material, so more containment was added. It is expected that sediment will soon accumulate at the containment to block flow even more.

At the next dredging event, we will move the float dependant on water level and where it will be judged to be most needed.

Containment 5a seems to be working well(Upper Left). Mud within Cell 5 is thick but fluid (Upper Right).Divets made by the paddle show above the surface left of the canoe(Lower Left). Mound created by the first 6 hours of dredging(Lower Right).

 

Delta formations as the mud fills the area. The view is to the south from the small containment 5a.The first mound is visible above the float.


View from the end of the inlet west toward the main pond. Mud is slowly filtering through the submerged aquatic vegetation, but hasn’t made it to the end.

View of the “delta” looking back toward the small containment 5a and the dock.

This figure shows the layout of the experimental cells. North is to the top. Cell 5 containment at 5a and 5b is complete, and the 4s will be next.

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