What is a key requirement for access manholes in sewage systems?

Access manholes in sewage systems are designed to provide safe and convenient entry points for maintenance and inspection of the system. One of the key requirements is that these manholes must be located above the outlet of the tank. This ensures that any maintenance activity can occur without encountering the effluent that may be present within the tank, thus promoting safety for the workers and preventing unintended contamination or overflows from the system.

Positioning the access manhole above the outlet also helps in ensuring that any necessary cleaning or maintenance tasks can be performed effectively without the risk of wastewater backflow obstructing access. This requirement supports both the safety of personnel and the operational integrity of the sewage management system by allowing for easier monitoring and servicing of the system’s components.