What is the recommended slope for a drainage pipe?

The recommended slope for a drainage pipe is typically 1/4 inch per foot. This slope allows for adequate flow of wastewater while preventing the accumulation of debris and standing water within the pipe. A slope of 1/4 inch per foot is considered to strike a balance between efficient drainage and minimizing the risk of the pipe becoming too steep, which could lead to increased velocity and the potential for erosion or the carrying of solids out of the pipe.

In plumbing codes and practices, maintaining this slope helps to ensure that the water flows freely towards the drainage system without creating unnecessary pressure on the pipe or causing potential backups. Therefore, using 1/4 inch per foot is essential for both functionality and longevity of the plumbing system.