Waste Water and Rain Water combined drainage?

18 Oct 2013
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United Kingdom
Hello guys. We are renovating a flat (above a row of shops) and our flat is the only one which has the kitchen waste pipe going into the rainwater gutter. The rest of the flats have the kitchen waste pipes run internally and going to the soil pipe (which incidently is literally right next to where the rainwater drain is) Rainwater drain on the outside of wall, soil waste inside property.

Now I'm not sure if this rainwater gutter connects to the main sewers at the manhole, but I can only see one manhole cover and it looks as if they may be connected together under ground. I dont see a seperate manhole cover for the rainwater pipes.

Are we ok to leave it as it is? Or is there a way of checking that the waste and rainwater are seperate?
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Can often depend on age of building, anything pre 1950's usually has combined system, (foul and rainwater into the same drain), a dye test will determine what is going where if still unsure. If rainwater is deemed to be separate then you'll have to run the kitchen wastes to a suitable drain.

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