Dredging news (including at Benson!)

angelaquayle

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Recent news release on dredging.
A £500,000 floating ‘vacuum cleaner’ will soon be on the River Thames, removing the sediment from the river bed to make life easier for boaters this summer.

The Versi Dredge, from contractors Land and Water, re-profiles the river by sucking up the soil from shoals formed on the river bed and pumping it up to 1km away to a different location.

Unlike traditional dredging there is no waste product from this operation and therefore more environment friendly. However, this operation will be carefully managed to ensure fish spawning grounds are not disrupted.

Ben Price in Operations Delivery for the Environment Agency said: “The Versi Dredge can do the work of 10 pieces of current equipment.

“It is the only one of its kind in the UK and we are really excited to be able to use it on the River Thames. It is a much quicker method of re-profiling the river bed and with no waste to dispose of it is far more environmentally friendly than traditional methods.

“River bed re-profiling is part of our ongoing maintenance work on the Thames’s navigation channel. Of course the work will be carried out in a way that minimises the impact on fish spawning areas.

“We had planned to carry out this work earlier this year but have been delayed because of the high flows in the river. However, we are hoping this work will only take about two weeks to complete.”

The Versi Dredge will be used at Benson Lock, Osney in Oxford, and in the reach between Pinkhill and Eynsham.

Mark Rowe, Operations Manager for the Upper Thames said: “We have a duty to maintain the river to a certain depth so boaters can safely navigate. Flooding and strong flows make this work challenging so I’m very pleased we are able to deal with shoals that have been a problem for boaters recently.”
 
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pumping it up to 1km away

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no waste to dispose

[/ QUOTE ] = back into the river? /forums/images/graemlins/confused.gif

Can you explain more or perhaps point us at a Web Page that explains this new equipment?
 
So that\'s what it was...

I saw the strange machine with thrashing paddle wheels late last week in the lock cut below Osney. Forward cabin with a ginormous power plant.

No tail pipe so must have been scraping the bottom.

Minutes later I came across another weird box being pushed by one of those "airborne war surplus tugs"no visible attachments but a long pipe - 100m or so 600mm in diameter trailing along behind.

So something's happening.

Nice to see EA admitting that they have some duty......
 
mmm, two weeks to dredge the Thames. That's going to make a big difference to a a lot of reaches. /forums/images/graemlins/frown.gif
 
I think its all a big bluff and they are looking for sunken treasure Yaaaaaaaaaaaaaaaaaaaarrrrrr /forums/images/graemlins/grin.gif

I wonder what will happen when they hit a shopping trolley /forums/images/graemlins/blush.gif
 
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“We had planned to carry out this work earlier this year but have been delayed because of the high flows in the river.”


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Chicken and egg??

Seriously, very good news, thanks Angela
 
In a word doesn't this show why we have have a problem with the EA? Congratulations for at long last doing some dredging, but "far more environmentally friendly than traditional methods.". The problem with the EA is they have lots of responsibilities, and navigation is a pretty minor part, the envirinmental concerns far outweighing navigation. BW only have navigation to concern themselves with.

Still can't understand "and with no waste to dispose of", surely that's the whole point!

IanC
 
So we're now congratulating the EA on fulfilling their responsibilities eh?

/forums/images/graemlins/confused.gif
 
Historically the Nile flooded regularly and this additional fertile soil allowed a food surplus and the growth of one of the early civilisations, some of whose acheivements are with us today.

What's so environmentally unsound about Thames silt that means it can't be put on the bank?

Angelaq, I'd be interested, as would my son who has environment stuff in a Geography project ongoing and it might be useful to him as well.
 
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Still can't understand "and with no waste to dispose of", surely that's the whole point!

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I think thats whats called in the trade - SPIN.

Keep the masses in the dark, but tell them a few buzzwords they want to hear like "Dredging" and "Benson" but dont go into any detail in case they realise they've been had again. Its almost like budget day innit? /forums/images/graemlins/laugh.gif
 
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What's so environmentally unsound about Thames silt that means it can't be put on the bank?

[/ QUOTE ]

Could it be something to do with who owns the bank and whether or not they want, or will consent to dredgings being deposited there? They might even require a payment - back to financial constraints again.
 
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In a word doesn't this show why we have have a problem with the EA? Congratulations for at long last doing some dredging, but "far more environmentally friendly than traditional methods.". The problem with the EA is they have lots of responsibilities, and navigation is a pretty minor part, the envirinmental concerns far outweighing navigation. BW only have navigation to concern themselves with.

Still can't understand "and with no waste to dispose of", surely that's the whole point!

IanC

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And there's the rub. Lots of conflicting responsibilities and not enough cash in the coffers, not to mention cooperation issues with those that actually own parts of the river.

As for the waste disposal, much easier to suck away the material from shallow areas and distribute it widely over deeper areas. Sure , it will come back again eventually, but a fairly cheap way of solving short term problems.
 
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I think thats whats called in the trade - SPIN.



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Perhaps a little harsh? The key words in Andrea's post are surely re-profiles the river

Maybe they can dump it down the 5m holes described in another thread? Personally I would be happy with this, as one of the places they can dump is in the beautiful Penton Lake behind my house, and however fertile the Nile valley may have been, river dredgings stink and are a lot less beatiful than a lake!
 
And still the river will less capacity (as nothing will actually be taken out!) so we will get red boards much more often as we have already seen.

Short term thinking again by amateurs same as the Lockies houses.
 
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And still the river will less capacity (as nothing will actually be taken out!) so we will get red boards much more often as we have already seen.

Short term thinking again by amateurs same as the Lockies houses.

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Oh do get real, Mike.

All the things that really need doing need MONEY and the EA Thames Division has to make do with what it gets. For heavens sake when is everyone going to wake up to the fact that nothing on the Thames will really start to change until the whole issue of funding is resolved?

It doesnt matter who is calling the shots at Reading, and they could be the most competent managers in the world, without MONEY they can do little other than short term cosmetic changes.

Dredging isnt just about scraping bits up, its also about transporting the dredged material to a deposit site and depositing it as well.....MONEY !!!! Not to mention finding such sites in the first place, and as the EA doesnt actually own much land it probably means paying someone else to deposit on their land - more MONEY.

Ive pointed out before that the EA overall gets around £1 billion a year from central government. IMHO the Thames Region aint getting a necessary share of the pot !!!
 
Also the ability of the river to dissipate the rainfall is proportional to the profile and interface materials as well as its absolute volume, so a reprofiling excercise may well be a valid way of increasing capacity.

The excess volume during the winter months needs to be stored in Flood plains, and not concentrated into drains and culverts that weren't designed to carry it, and the river itself needs to be able to direct the flow to the sea quickly and efficiently.
 
Precisely, totally agree!

So patting them on the back when the problem has not been solved isnt going to help either?

I think the lockie campaign has shown that shouting from every orifice and making people aware does seem to bear fruit. I also think that while we have the MPs attention as to how lousy things are.....
 
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