03/11/2026
Wet season's on the way. Is the water behind your retaining wall going anywhere? Swipe through.
When soil behind a wall gets saturated and the water can't escape, it pushes against the wall. Over time that shows up as leaning, bulging, cracks, or water seeping through the face.
A proper drainage setup gives that water a way out:
- Free-draining gravel backfill instead of cheap fill
- Perforated ag pipe behind the wall
- Weep holes through the wall face
- Geotextile fabric so soil doesn't clog the gravel and pipe
It also helps to keep roof runoff and surface water from heading straight at the wall.
Read the full Cairns guide:
https://cairnsprecisionearthworks.com.au/blog/do-retaining-walls-need-drainage-cairns-guide/
Worried about a wall at your place? Call 0407 743 381 or email [email protected].