My Wet Patch

[d000hg]

So the bars remaining in the ground doesn't 'block' the holes? I could see it working if you had a steel pipe with holes drilled in it.

But it sounds easy, you just get like 1m lengths of iron rod and a sledge hammer? (OK, maybe not easy but simple)

[veggiechicken]

You pull the rod out - leaving a hole!! Fill it with sand or gravel to improve drainage, if you want.
I was going to suggest you check for water mains (or any underground pipework before you do it). I see from your previous thread that you know where the pipes are http://www.growfruitandveg.co.uk/gra...tch_78977.html

[d000hg]

Oh yeah, that was when I thought the soil was just too clay-ey. Now I realise the soil is the same everywhere, it just doesn't drain in that corner.

Hammering in and leaving permanently hollow rods with holes in I could see being an option, but I never heard of such things. Such a "minimally invasive" approach would be great!

[Bigmallly]

How is leaving tubes in the ground going to help drainage unless they have holes drilled into them through the length of the tube.

[bearded bloke]

Can you take some photo's of the general area so we can see what you have to work with please. Great care needs to be exercised here in how & where you redirect the water as undermining the wall that supports the road could potentially cause even more problems.