Unable to find anyone with availability to dig the drain behind our house, I decided to hire a digger and do it myself - I m quite handy with a digger these days. It is a tricky operation because of the depth, the overhanging eaves and because you have to dig at right angles to the digger. All started well digging down through the rock and clay backfill but at about 90cm (3 feet) depth I found an old concrete drainage gulley running the length of the back of the house. It was too thick to break through with the digger. The water has been coming into the house deeper than this on the inside of the bathroom so...Was all the clay above the old gulley stopping it from working? Or is there a subterranean water course deeper down? There was no way to dig deeper without a bigger digger so I decided to install a perforated land drain at the level of the gulley surround it with clean gravel and a geotextile and make a proper exit pipe for the water forward of the house and hope for the best. I might not know if it has worked or not until we get very heavy rain again! Meantime I've added plenty of RIW to the inside of the bathroom wall, hoping that may also help.
Platon sheet, perforated drain and geotextile in place ready for gravel
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