What is the minimum burial depth recommended for mainline pipes in an irrigation system?

The minimum burial depth recommended for mainline pipes in an irrigation system is typically 12 inches. This depth is crucial for several reasons. First, it helps to protect the pipes from surface impacts, such as those caused by vehicles or lawn equipment, which could otherwise cause damage. Additionally, a depth of 12 inches tends to insulate the pipes from frost, especially in climates where freezing temperatures occur, thus preventing potential ruptures in cold weather. Proper burial depth also helps with the maintenance of soil moisture levels and minimizes the risk of erosion or subsidence affecting the integrity of the irrigation system.

When considering other depths listed, while deeper burial may provide added protection, 12 inches strikes a good balance between safety and practicality, making it the minimum recommended depth for effective irrigation system function.