If a sewer line is installed closer than 10 feet to a water line, what is the minimum depth the sewer line must be below the water line?

The correct answer indicates that if a sewer line is installed closer than 10 feet from a water line, it must be placed at a minimum depth of 18 inches below the water line. This requirement is crucial for maintaining the integrity of both systems and ensuring public health and safety.

The reasoning behind this regulation is primarily to prevent the risk of contamination from sewage entering the potable water supply. A deeper placement of the sewer line provides a safety buffer that minimizes the potential for any leaks or breaks in the sewer line to contaminate the water line above. The 18-inch standard adds an extra layer of protection, particularly in areas where soil conditions and other environmental factors may pose a higher risk.

Maintaining the proper depth for sewer lines is a critical aspect of sewage system design and implementation, and it helps to meet both health standards and local regulatory requirements. Understanding this ensures that contractors can make informed decisions regarding sewage system installations and comply with health regulations effectively.