Which method is commonly used for draining manholes?

The most commonly used method for draining manholes is the storm sewer. Storm sewer systems are designed specifically to manage and redirect surface water and rainfall runoff effectively. They connect to a network of pipes and drainage systems that facilitate the flow of water away from manholes and other areas prone to flooding. This method is efficient because it harnesses gravity to move water away from locations where it can create issues such as blockages or overflows.

Each manhole is typically connected to this storm sewer system, allowing water to drain quickly and naturally without the need for additional mechanical assistance. The design of storm sewers ensures the efficiency and reliability of drainage, particularly during heavy rainfall or storm events, making them a preferred choice for managing water drainage in urban infrastructure.

Other methods may be used in specific situations or for specialized purposes, but the storm sewer is the standard solution for operational efficiency in draining manholes.