4 min read
How water overloads a wall
Water trapped behind a wall adds hydrostatic pressure on top of the soil pressure. It also softens clay, reduces friction under the footing and can wash fines out through joints.
What good drainage looks like
- Free-draining aggregate directly behind the wall
- Geotextile fabric to stop soil clogging the aggregate
- Slotted agricultural pipe at the base with a fall to an outlet
- A legal stormwater discharge point and inspection openings
- Surface water diverted away from the top of the wall
Warning signs
- Wet patches or staining on the wall face
- No water ever coming out of weep holes after rain
- Leaning, bulging or opening joints
- Cracking or settlement in the ground above
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