What is the purpose of a weep hole in erosion control?

The purpose of a weep hole in erosion control is to allow water to drain from a structure without building pressure behind it. Weep holes are typically small openings placed in retaining walls or similar structures that facilitate the escape of excess water. When water seeps into the structure, it can create hydrostatic pressure, potentially leading to damage or failure of the wall. By providing a pathway for water to exit, weep holes help to alleviate this pressure, promoting stability and prolonging the lifespan of the structure.

This function is crucial in managing groundwater and preventing soil erosion behind retaining walls and other structures, helping to maintain the integrity of the surrounding area. Other options, while they relate to aspects of erosion control or water management, do not accurately describe the specific purpose of weep holes.