Damo
regular
Reged: 22/02/2005
Posts: 2626
Loc: k keeper,Portishead
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I have come across some pics of the Portishead lock - one of the deepest in the Europe, if not the world! If you got your tide times wrong then this is what you might see 
(NB His feet are at 3.0m aCD, and you can see why you may be asked to go portside-to if it is the last lock of a tide)
And this is an aerial view from 1950, when the power station and phosphorus plant were in full-swing
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Never be at a loose end with the Yosemite bowline 
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csail
regular
Reged: 24/08/2005
Posts: 3613
Loc: Rhoose/Cardiff Bay,UK
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Why is it sloping, can only assume to flow the mud away?
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Reduced price for you guys seeing as it is only a hobby. http://www.h2o-marine.co.uk/
(mention this forum)
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Damo
regular
Reged: 22/02/2005
Posts: 2626
Loc: k keeper,Portishead
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That may be part of it, but I think it is mainly due to the fact that the right wall is the original stone and there is an engineering reason to brace the foot of it. Looking the other way you can see how the base of the old outer lock barrel is curved:
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Never be at a loose end with the Yosemite bowline
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Elza_Skip
regular
Reged: 04/10/2004
Posts: 342
Loc: Bristol, England
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Fascinating, however I think Sharpness is more daunting- Not sue if it is deeper but it's huge as well! 
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LizzyD
regular
Reged: 17/05/2006
Posts: 152
Loc: Bridgend
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nice one Damo. I love this engineering stuff. It's absolutely fascinating. I don't know how these people have the imagination and innovation to dream these things up. Right, after yesterdays rugby fest, I'm off to watch the Jocks and Frogs.
Take care all,
Lizzy D
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Sneddon
regular
Reged: 26/02/2007
Posts: 2320
Loc: Bristol
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Yea, interesting photos Damo, thanks.
No one over here (England) has mentioned the rugby all day!
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"See the rainbow not the rain"
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mrbloto
regular
Reged: 31/12/2007
Posts: 201
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i wonder why 
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donm
regular
Reged: 17/07/2005
Posts: 288
Loc: Barry, Bristol Channel
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It was common practice in masonry gravity retaining walls to progressively thicken the wall from the top to the bottom, resulting in a heavy load which needed to be spread over a greater area of the foundation. The land side of the masonry wall is probably stepped out as it goes deeper and is likely to be 4 or 5 times thicker than the concrete wall to the other side. More modern reinforced concrete structures are much more efficiently designed as reinforced concrete is inherently stonger than bonded masonry, so the wall can be thinner and lighter and consequently need less foundation area.
But although this may be the case, it might also be that it was built as way of shedding the mud to one side!
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Damo
regular
Reged: 22/02/2005
Posts: 2626
Loc: k keeper,Portishead
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Within the marina itself, the old quayside stone wall has been retained along one side, with new construction very close. Marina water levels need to be maintained above a certain height so the masonry wall gets enough support. Supposedly there is a danger of collapse if the level gets too low.
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Never be at a loose end with the Yosemite bowline
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Jobs_a_good_un
regular
Reged: 28/01/2005
Posts: 1211
Loc: home bristol boat where ever ...
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Thats a baby this is the deepest lock in europe 23 m
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“Fortitudo et Honor”
Boat name " Gemini Girl "
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