The minimum slope required for 102 mm diameter or larger drainage piping is _____.

The minimum slope required for 102 mm diameter or larger drainage piping is 1%. This slope is crucial because it ensures that wastewater flows smoothly through the pipes by utilizing gravity. A slope of 1% means there is a drop of 1 cm for every 100 cm of horizontal distance, which is adequate for promoting self-cleansing velocities in the pipe. This helps prevent the buildup of solids and ensures effective drainage, reducing the risk of clogs and system failures.

Slopes that are too gentle may not provide enough force to move waste efficiently, leading to stagnation and potential blockages. Conversely, slopes that are too steep can lead to increased wear on the piping system and may cause issues with proper waste flow and venting. Therefore, the 1% minimum slope is established as a standard to strike a balance between effective drainage and minimal risk of plumbing system issues.