A storm sewer shall be made of what type of pipe when the size can be 8 inches and smaller or 10 inches and larger?

The question pertains to the materials suitable for storm sewer piping based on their size. For storm sewers that are 8 inches and smaller, a high-density polyethylene (HDPE) or polyvinyl chloride (PVC) could typically be specified, but when considering options, ABS (Acrylonitrile Butadiene Styrene) emerges as a valid choice, particularly for smaller diameter piping. ABS is known for its lightweight and sturdy characteristics, making it a practical option for storm drainage systems in residential and commercial applications, especially when dealing with smaller diameters.

For larger pipes, particularly those that are 10 inches and larger, other materials like cast iron or steel are often favored due to their durability and strength to withstand the external forces and pressures associated with larger volumes of water flow. While PVC is common for a variety of plumbing applications, the specifications for storm sewers often require materials that are resilient to the conditions typical in storm water management scenarios.

In essence, ABS is typically specified for small diameter storm sewers due to its advantageous characteristics, and while in practice some may choose PVC, ABS remains a valid answer in the context provided.