Catch basins in my jurisdiction have round covers on a square structure. The cast iron frame is square with a circular hole in the top. Edit: for example http

Catch basins in my jurisdiction have round covers on a square structure. The cast iron frame is square with a circular hole in the top. Edit: for example https://maps.app.goo.gl/m8rR4vrPHBPTyXxo9 https://maps.app.goo.gl/m8rR4vrPHBPTyXxo9