What is the minimum size of SDR 35 pipe that can be used for storm sewers inside a building?

The minimum size of SDR 35 pipe authorized for use in storm sewers inside a building is 10 inches in diameter. This specification is based on several factors including flow capacity, structural integrity, and local building codes that govern stormwater management systems.

Using a 10-inch diameter pipe ensures adequate flow capacity to handle the volume of stormwater runoff, which is crucial for preventing backups or flooding within the building. Smaller pipes may not provide sufficient drainage, leading to inefficient water removal during heavy rainfall or storm events.

Larger pipe sizes, such as 12 inches or 14 inches, could also be used; however, they are beyond the minimum requirement and may not always be necessary, leading to increased costs and material use without additional benefits in certain applications. Thus, the choice of 10 inches strikes a balance between functionality and efficiency in the design of storm sewers in buildings.