True or False: The maximum distance between manholes on underground drainage lines that are 10 inches in diameter or larger is 150 feet.

True or False: The maximum distance between manholes on underground drainage lines that are 10 inches in diameter or larger is 150 feet.

• A. False
• B. Not specified
• C. Not applicable
• D. True

Answer: (D)

Maintaining accessibility for cleaning and inspection is the main idea here. For underground drainage lines that are 10 inches in diameter or larger, the code specifies that manholes should not be spaced more than 150 feet apart. This spacing ensures you have an accessible point for rodding, camera inspection, and cleaning along the entire run. If distances were greater, a blockage or buildup could occur in a section beyond reach, making maintenance much harder and increasing the risk of backups. So the statement is true because the 150-foot maximum spacing for manholes on these larger-diameter lines is a maintenance-access guideline. Smaller lines or other configurations may have different requirements, but for 10 inches and up, 150 feet is the standard limit.

Maintaining accessibility for cleaning and inspection is the main idea here. For underground drainage lines that are 10 inches in diameter or larger, the code specifies that manholes should not be spaced more than 150 feet apart. This spacing ensures you have an accessible point for rodding, camera inspection, and cleaning along the entire run. If distances were greater, a blockage or buildup could occur in a section beyond reach, making maintenance much harder and increasing the risk of backups. So the statement is true because the 150-foot maximum spacing for manholes on these larger-diameter lines is a maintenance-access guideline. Smaller lines or other configurations may have different requirements, but for 10 inches and up, 150 feet is the standard limit.