What is the purpose of backfilling around water mains and services?

• A. To prevent any changes in soil moisture near the pipe.
• B. To provide stable support, protect the pipe, and restore ground conditions.
• C. To insulate the pipe from temperature changes.
• D. To allow drainage around the trench.

Answer: (B)

Backfilling around water mains and services provides stable support, protects the pipe, and restores ground conditions. After trenching, the pipe needs a solid foundation and a cushion of appropriate material to prevent movement, deformation, or damage from loads above. The bedding and surrounding backfill distribute loads evenly, help keep the pipe in proper alignment, and prevent voids or settlement that could stress joints or cause leaks. Proper compacting around the pipe also minimizes future settlement and maintains the integrity of the trench area, mirroring the surface and soil conditions that existed before excavation. While moisture control, insulation, or drainage can be factors in some projects, the primary purpose of backfilling is to provide support, protection, and a stable, restored ground condition around the pipe and services.