Manholes in straight runs should be spaced no farther apart than what distance to ensure appropriate cleaning?

The appropriate spacing for manholes in straight runs is critical for effective maintenance and cleaning of the sewer system. Manholes should be located close enough to each other to allow for proper access and cleaning of the pipes. The correct choice indicates that manholes should be spaced no farther apart than 300 to 500 feet.

This distance ensures that during cleaning operations, maintenance personnel can efficiently remove debris and blockages without having to rely on overly long sections of pipe that could become difficult to service. By allowing access at intervals within this range, the system can be kept functional and the risk of clogs is considerably reduced.

Manholes spaced beyond this range may lead to difficulties in performing necessary maintenance tasks, as cleaning equipment may not be able to reach far enough without risk of damaging the infrastructure or missing areas that require attention. A balance must be achieved between adequate spacing for maintenance work and minimizing the length of pipe that can accumulate debris.