What is the minimum slope of horizontal drainage piping for sizes 8 inches or larger?

The minimum slope of horizontal drainage piping for sizes 8 inches or larger is typically set at 1/16 inch per foot. This standard is established to ensure proper drainage and to prevent the accumulation of waste and water within the pipe, which could lead to blockages or backflow. A slope of 1/16 inch per foot allows for adequate flow without risking the structural integrity and function of the piping system. Maintaining this slope is essential in larger piping systems due to their capacity to carry greater volumes of waste, where insufficient slope might result in ineffective drainage and increased potential for problems in the plumbing system.