Municipal inspection wells are divided into rainwater inspection wells and sewage inspection wells
The bottom height of the rainwater inspection well is equal to half of the rainwater pipe, that is, when the rainwater pipe passes through the inspection well, the height of the pipe The upper part is exposed from the bottom of the well.
The bottom of the sewage inspection well is level with the top of the sewage pipe. That is, when the sewage pipe passes through the inspection well, the entire pipe is below the bottom of the well.
Of course, this flow channel is not a water pipe, but is made of masonry or concrete poured when making a well. They are all made into a "U" shape.
The bottom of the municipal well is not flat. It is not like we imagine that the pipe is inserted into the well and it is done. There are very strict standards for inspecting wells.