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Ben689908
The waste pipe from my kitchen sink discharges into the top of a gully outside. I've noticed the sink draining slowly and backing up occasionally.
Turns out the inlet pipe to the gully clashes with the side of the cast iron grating cover, which reduces the effective pipe diameter considerably. Even a small fragment of something (unsure what, let's say potato peelings?!) can block the whole pipe.
Before I cut a notch in the plastic pipe to solve this issue, am I missing something about why this was installed in this way?
My assumption is that it was installed by someone who wasn't competent and/or wasn't paying attention. My alternative hypothesis is that it was done deliberately. Any ideas if that might be the case?
Cross-section sketches (not to scale!):