Which of the following pipe types is allowed in drainfields?

In the context of drainfields, the use of pipe types is subject to specific guidelines that ensure proper function and maintenance of on-site sewage facilities. The correct option, which is 3 inch PVC pipe, is widely accepted for drainfields due to its adequate size for the flow of effluent and its resistance to corrosion, ensuring longevity and reliability in septic system applications.

3 inch PVC pipes provide a good balance of capacity and fitting compatibility with other components of the sewage system. They are large enough to handle typical sewage flow while still being manageable for installation processes. Additionally, their smooth interior surfaces minimize friction loss, which helps maintain adequate flow rates.

Using pipes that are either too small, like 2 inch PVC, may lead to blockages or insufficient drainage capabilities, while larger sizes, such as 5 inch PVC, can be excessive and lead to unnecessary material costs or complications with installation. 3 inch copper piping is generally not suitable for drainfields due to its susceptibility to corrosion from soil conditions and the high cost of installation compared to PVC alternatives.

Overall, the selection of 3 inch PVC aligns with best practices in the installation of drainfields, ensuring efficient wastewater management and minimal maintenance issues over time.