What is required in solid masonry or concrete retaining walls to eliminate the buildup of hydrostatic pressure?

Weep holes are crucial in solid masonry or concrete retaining walls to manage hydrostatic pressure effectively. When water accumulates behind a retaining wall due to poor drainage or heavy rainfall, hydrostatic pressure can build up, leading to potential failure of the wall. Weep holes allow excess water to escape from the wall, reducing the pressure exerted on it.

These openings are typically placed at intervals in the wall so that water has a way to drain out, thus helping to maintain the structural integrity of the wall by preventing water from accumulating. By facilitating drainage, weep holes play a significant role in prolonging the lifespan of retaining walls and ensuring they function correctly under various environmental conditions.