Install Drainage Aggregate and Optional Drain Tile

What happens here

Constructing the retaining wall also involves integrating a proper drainage system. Place drainage aggregate (gravel) directly behind the blocks, and if desired, a perforated drain tile can be laid at the base of the wall. The video explains that for properly designed walls, drain tile is often optional as the gaps between blocks are usually sufficient for water to free-flow through the rock backfill. The drainage aggregate should extend the full length of the geogrid behind the wall, typically 12-24 inches deep. This allows any water that passes through the soil to quickly and easily flow out through the wall, preventing hydrostatic pressure buildup.

Goal: Ensure effective drainage to prevent hydrostatic pressure behind the retaining wall.