What is the recommended course of action when a grade conflict exists between a water main and a sewer main?

The recommended course of action when a grade conflict exists between a water main and a sewer main is to have the water main adjusted while keeping the sewer main's grade. This approach is essential because maintaining proper separation and grading between these two utilities is critical for preventing contamination.

If the sewer main is set at a lower grade, it helps to ensure that any potential leaks from the sewer do not contaminate the water supply in the water main. Adjusting the water main minimizes the risk associated with contamination and aligns with industry standards and best practices. This method prioritizes public health and safety by reinforcing the integrity of the water supply system while allowing the sewer system to function efficiently.

In contrast, other choices may not adequately address the risks. Leaving both lines as they are might pose a significant hazard due to the potential for cross-contamination. Re-routing the sewer main underground could complicate the system unnecessarily and could be costly. Lowering the sewer main while raising the water main would not resolve the conflict effectively and could still leave the water supply at risk depending on the circumstances. Thus, adjusting the water main is the preferred and more effective solution.