This is why retaining walls fail!

追加: 2026-05-28

[00:00:00]This is why retaining walls collapse.

[00:00:02]>> [music] >> Without drainage, water traps behind the wall, creating massive pressure that destroys the concrete. But on the right, clean gravel and perforated pipe channel the water away smoothly, keeping the structure perfectly safe.

[00:00:18]Build it right, and you won't watch it fail.