Buenos noches

Anyone willing to help this thicko with a drain problem?

Looking to put in a linear drain around the edge of a badly done patio, perforated pipe and clean gravel type, and connect it into a combined SW/foul gully.Connecting it to the gully has me

It looks like a square clay box, with 2 kitchen or bath wastes feeding into it, as well as 2 down pipes. The top of the gully is about 250 mm below the paving. Bad bad paving job.

I've done plenty of laying of these types of drains, but never connected into one of these yokes. I say it's combined, because one there are bad smells coming out of it now and again, and two it's at the back of an old house, at basement level, so I don't recon there is any SW drain nearby. the falls are pretty good, as the bottom of this gully might be 500mm below top of pavement. Ideally I'd like to cut in somehow to the side, but that just sounds too easy. I probably am going to have to replace the whole thing with something plastic, and open a world of pain for myself. I suppose there is the other option of connecting into the sewer pipe with a p trap , but at means lifting slabs and a lot a digging, and if I remember those connectors ain't cheap.

I am using an iPad and can't upload pics but I will do later.

Probably best asked in the building section.

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