O Scale 1:48
The sanitary sewer is a system of underground pipes that carries sewage from bathrooms, sinks, kitchens, and other plumbing components to a wastewater treatment plant where it is filtered, treated and discharged. The storm sewer is a system designed to carry rainfall runoff and other drainage.
This is an O scale (1:48) model of a part of this system – various risers. This sits between the base at the bottom and the top where the cone that the manhole cover and mounting ring sit on.. this is normally the only part you see in the road.There may be additional risers depending on the depth of the base .. basically extensions up to the surface.