Which of the following pipe specifications is required for standard drainfields?

The specification for a minimum of 3 inch SDR35 pipe for standard drainfields is based on its capability to ensure adequate flow and proper drainage of effluent in on-site sewage treatment systems. A 3 inch diameter allows sufficient volume for the wastewater to flow freely while minimizing the risk of clogging. SDR35, which stands for "Standard Dimension Ratio 35," refers to the wall thickness and strength of the pipe, indicating that it is designed for use in non-pressure applications such as drainfields.

Using the correct size and specifications for drainfield piping is crucial to ensure that it can handle seasonal variations in water levels and potential blockages. This helps maintain the effectiveness of the treatment system and protects the environment by preventing backflow or overflow issues. Smaller diameter pipes may not accommodate sufficient flow, while larger pipes than necessary can increase project costs and may lead to other hydraulic issues within the system.

In summary, the requirement for a minimum of 3 inch SDR35 pipes for standard drainfields is essential for providing the right balance of flow capacity and structural integrity, ensuring effective treatment of effluent in an on-site sewage system.