Backfilling with Drainage Aggregate

What happens here

Once the first course (or subsequent courses) is laid, backfill the area immediately behind the blocks with drainage aggregate, such as ¾ inch crushed gravel. This aggregate allows water to drain freely, preventing hydrostatic pressure buildup behind the wall, which is a major cause of wall failure. Ensure the backfill is placed in layers (typically 6-12 inches) and compacted thoroughly. The video demonstrates this step, highlighting the gravel behind the wall.

Goal: Provide adequate drainage behind the retaining wall to prevent hydrostatic pressure.