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Discussion Topic: Further dredging
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BuffaloBill |
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Mardles sometimes
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Why hasn't the lower Bure by the Yacht Station down to
The Yellow post been dredged, particularly close to and
under the bridges meaning boats having to pass quite
close, and some don't give way and come through the
middle of the Red Arrows leaving no room for boats going
with the tide. It has caused me a couple of problems
over the last 2 years. Can it not be dredged to give us
more room?
The older I get...
The better I was....!!
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JP |
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Evening BBill,
Will investigate in the morning and come back to you.
Regards
John
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BuffaloBill |
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Mardles sometimes
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Thanks John.
I also meant to add that it may help with Batrabill's
comments about lowering water levels around Potter as
the Bure narrows here and I'm sure contributes to
restrictions on the outflow from the Bure. There is a
significant build up of mud around that area which also
can make navigation difficult at times as I mentioned
in my post above.
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The better I was....!!
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BuffaloBill |
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Mardles sometimes
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Not forgot about me have you John?
The older I get...
The better I was....!!
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JP |
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Good morning BB,
No certainly not forgotten about you - just been really busy.
The Lower Bure has had a consistent dredging regime for the last 5 seasons, with over 50,000m3 of accumulated sediments being removed.
The section between the Yacht Station and the entrance to Breydon is a canalised channel (heavy sheet piles line the river walls) and this means dredging has to done differently.
Heavy piles rely upon a large proportion of the pile being below the river bed level, this gives the piling its stability and stops the weight of the ground pushing the piling over. Therefore dredging or removing material from the piled edge is not done.
The piled edge is also where the vast majority of obstructions are located (hidden, submerged items deposited into the river system) so staying more central is best when transiting this section.
The nature of the tidal range at this location, coupled with the canalised channel means that the tidal action alone is enough to sweep most sediment out into the sea channel, although this does also mean that some sediment is swept back in on the flood tide.
The channel past the Yacht Station is adequate for two vessels to pass side by side as long at the adhere to the posted speed limit, they understand what the tide is doing (ebbing or rising) and they avoid hugging the edge (too close to the piled edge).
Therefore when we survey this lower section of the Bure, it does not normally need any sediment removal in order to maintain its specification.
Hope that answers your question.
With regards
John
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Nov-22-2018 @ 6:12 PM
