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 – a 50 inch base. This sits at the bottom with sewer pipes entering the bottom of the casing. There are additional risers .. basically extensions up to the surface. On the very top is the cone that the manhole cover and mounting ring sit on.. this is normally the only part you see in the road.