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Thanks for that Graeme. Briefly saw the follow up to the deleted post and in fact that was a valid point, albeit very stupidly put. Even for a very small stream, the Environment Agency may apparently be concerned about any interference with water flow and water quality so I may revise the...

Doesn't sound too good so far. This is not Crossrail or the new Thames new container port, just a small pond construction in the countryside. Thanks for the replies - my simple Plan A probably won't work. I've come across Parex aquatic mortar on the web, otherwise is there a Plan B that does...

Need to build a 1.5 metre wide 75cm tall brick wall in a gently flowing stream. Can I use a standard 3:1 sand cement mix for this and allow it to set slowly under water? I was thinking of erecting a board on the downstream side for a few days to support the wall (which would be 3 or 4 bricks...