O Scale 1:48
The storm sewer is a system designed to carry rainfall runoff and other drainage. It is not designed to carry sewage or accept hazardous wastes. The runoff is carried in underground pipes or open ditches and discharges untreated into local streams, rivers and other surface water bodies. Storm drain inlets are typically found in curbs and low-lying outdoor areas. Some older buildings have basement floor drains that connect to the storm sewer system.
This is an O scale (1:48) model of one part of this system – a 18 inch Storm Drain Cover Riser. This sits on top/interlocks on either a base or risr depending on the depth of the base there can be risers – (I supply 12″, 24″ and 32″) that lock into either the base or another riser. You stack as many risers as needed. On the very top is this cover riser with a flat cover with manhole on the very top. This is normally the only part you may see.