What is the recommended slope for installing duct runs between manholes?

The recommended slope for installing duct runs between manholes is important for ensuring proper drainage and preventing the accumulation of water or debris in the ducts. A slope of 3 inches for every 100 feet strikes a balance between effective drainage and practical installation considerations. This slope allows for sufficient gradient to facilitate the movement of any moisture that might enter the ducts while not being so steep that it creates installation challenges or increases the risk of damage to the duct runs.

When considering slopes, it is essential to avoid both insufficient sloping, which can lead to potential water pooling, and excessive sloping, which can be impractical for installation and may cause stress on the infrastructure. The choice of a 3-inch slope aligns well with industry standards and practices, promoting both functionality and reliability in underground duct systems.