Hi, I'm trying to lay some sleepers in my back garden but have a manhole cover that I need to go around. That's fine, but about 2 feet from the cover there is a ceramic pipe about 4 inches in diameter that comes up out of the ground. It comes up right where I want to lay my sleeprs.
I've dug around it and can see that it is joined to the body of the manhole about 6 inches below the level of the cover.
I figure its some sort of vent but I've never seen this before with a manhole. The house is 1930s so I'm wondering if this is just something that was needed back then and maybe is redundant now.
Basically I want to just fill it in and put a sleeper on top but I'm concerned that I might cause some sort of build up of smelly sewer gases and end up blowing up my new back garden!