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Where's the water coming from? That's the first issue that needs to be sorted.
Is the a compacted pan?
Then land drainage into a soak Away..
Then lawn aeration and top dressing with sharp.
I'm sure it's close to a stream , may even run underneath...core aerate then fill holes with sharp??@
You've found the cause, I would think you would have to find a way to block the water flow or redirect it, without flooding someone else's garden.
I use aeration and sharp sand on heavy soils alot, but if you don't deal with the water source I doubt it would help.
do you have to use horticultural? Or is 'sharp sand' salt free?
I just use straight up sharp sand from the builders merchant,I've never noticed any negative effects to lawns or plants, in over a a decade of using it. I'm sure some purist's would disagree, but it works and is much cheaper than washed Hort sand. The way I look at it is, it's such a small volume percentage compared to the soil volume, it really improves work-ability and drainage of heavy soil.
You could plant a willow tree, there good at sucking up water!
Cheers mate I'll have a chat with the customer
Only in the summer!
the site seems to be on a slope if it is the stream or spring running under the lawn could you pipe it away or under the lawn
the lawn will have got comacted and will need airating and maby top dressing and seeding with a mix that is sutable for that area as it seems that it could be a shady area
i used to really enjoy sorting out customers drainage issues . Have a good look at the surrounding area to ascertain the cause of the problem
If the levels allow and only when drier i would consider hand digging a full spades depth , let it dry , chop it up and put 75-100 ml of horticultural grit on top and rotavate it in .