Select Proper Drainage Aggregate

What happens here

The video starts by contrasting inappropriate drainage materials with correct ones. Using pea rock (small, rounded stones) behind a retaining wall is a common mistake because water running through it can cause the rocks to roll and move, leading to soil loosening, hydrostatic pressure buildup, and silt/sediment seepage through the wall face. Instead, 3/4-inch clear angular stone should be used. This type of stone interlocks with itself and the surrounding soil, preventing movement and effectively managing water pressure.

Goal: Ensure stable and effective drainage behind the retaining wall.