I don’t go into the sewers myself but when I go out on site I meet up with a site crew, and one of the crew are lowered into the manholes to taken information, photos and all the measurements I need to start building or update the model. I stay at the side of the open manholes and do look down them also, but I don’t enter them.
I take with my plans of the manhole and sewers to be surveys, maps where necessary and also plans of specific assets to be surveys, such as sewage treatment works, pumping stations or screens.
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