What type of piping must a sewer installed less than 24 inches deep and subject to vehicular traffic be constructed from?

When installing a sewer that is less than 24 inches deep and subjected to vehicular traffic, the piping must be durable and capable of withstanding the pressure and stress from above. Solid core PVC piping is specifically designed to handle such conditions due to its strength and structural integrity.

Solid core PVC is pressure-rated and has the ability to resist impacts and deformation, which is crucial in scenarios where vehicles may be present. Its rigidity is important in preventing collapse or damage over time. Furthermore, PVC piping is resistant to corrosion and various chemicals, making it a long-lasting choice for underground applications.

Other materials such as ABS and CPVC piping do not provide the same level of strength required for heavy traffic situations. ABS is generally more flexible but also more susceptible to damage under heavy loads, while CPVC, though good for hot water applications, is not typically used for sewer installations subject to vehicular loads. Cast iron piping, while durable and traditionally used in sewer systems, can be heavier, more expensive, and less practical for shallow installations compared to PVC. Thus, solid core PVC emerges as the most suitable option for the specific conditions described.