What diameter should weep holes in retaining walls typically be?

Weep holes in retaining walls are designed to alleviate hydrostatic pressure by allowing groundwater to drain away from the wall. The typical diameter for weep holes is crucial to ensure that water can escape effectively while preventing clogging from dirt and debris. A diameter of 4 inches strikes a balance: it is large enough to permit sufficient drainage while also minimizing the risk of becoming blocked. Smaller diameters, like 1/2 inch or 1 inch, may not provide adequate drainage for significant water accumulation, and larger sizes, such as 6 inches, can be unnecessary and potentially compromise the structural integrity of the wall. Therefore, a 4-inch diameter is commonly recommended within engineering practices for retaining walls to ensure effective water management and maintain stability.