You're looking for a solid piece of information on BS EN 12056-1:2000, which is a British Standard that outlines the requirements for prefabricated vertical drainage systems used in buildings.
The standard covers various aspects of gravity drainage systems, including:
: Ensures systems are designed for high hygiene standards, safety, and adequate hydraulic capacity to prevent flooding or foul odors.
Unfortunately, I couldn't find a direct link to a free PDF download of BS EN 12056. However, I can suggest a few options:
: Defines essential objectives for wastewater conveyance, including reliability, prevention of blockages, and protection against backflow and odors.


