>> Combined foulwater and rainwater drains are relatively common on older houses. The thirties semi where I used to live in Ilford had such a system.
Yes. Our 1846 London gaff had separate outside drains at the back, but they joined underground and went in a pipe with a very shallow incline right under the house to a big collector under the front area, with a manhole cover. From there it was supposed to go down a waste pipe into the passing sewer under the road.
I had to have a bit more to do with those drains than I wanted. Once the exit to the sewer got blocked and the collector filled up to the brim and backed up under the house until the drain at the back overflowed. So that was what the pong was! Had to probe into the lake under the front area for the outlet pipe with two drain rods - one wasn't long enough - until the blockage moved and a tsunami of hundreds of gallons of our accumulated excrement, bathwater etc rushed into the sewer trying to pull the rod out of my hands. Yuck.
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