Friend lives in a terraced house, back garden slopes to house but has no actual drains. Situation made worse as he has pretty much slabbed most of it so not much soak through.
He does have a downpour from the roof gutter that goes fully into ground, presumably into a waste pipe of some sort?
My question, how easy is it to tap into one of these pipes and make a drain away from the house? Down pipe is a square pipe but goes into a round base at ground level. I am thinking of one of the rectangular grid things like this
www.diy.com/departments/floplast-polypropylene-galvanised-steel-channel-drainage-grate-l-1m-w-120mm/1104821_BQ.prd
Is it easy to tap into the down pipe? Or special tools required! Not sure if it’s a case of cutting out a length and replacing with a T piece??
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