Sounds like you need a few agpipe/ballast crossdrains leading to a central drain that removes the subsoil water from your block....pretty easy in theory,really....
No idea how you confidently find someone…

And much more practical and in keeping with the natural environment.......
But hey.. certainly not as trick as the Brendan Moar garden water tank and you can even grow a lawn…

Yes..I've thought of that option..however I think the angular,pointed blue metal would penetrate the plastic and allow the infiltration of irrigation water plus our 4.2 metre annual rainfall and I…

Hi all...just found this forum...looks like a wealth of info to be had here.
Anyway I have just erected a shadehouse about 16 m x16m...
I am trying to come up with…