Are your retaining walls in good order?
In hilly areas, timber or concrete retaining walls hold back earth on a slope or at a change of level. If these are damaged in an earthquake, it can allow the land to slump and slide behind them.
- Looking at the retaining wall from one end, is the wall positioned correctly, eg standing upright or leaning slightly into the slope?
- Is there any missing timber or concrete?
- Are there any cracks or signs of damage?
Ask a chartered professional engineer for advice before repairing or replacing a retaining wall.
If you build a retaining wall more than 1.5m high, you need a building consent.
A retaining wall that has buildings or car parks or a road just above it, also needs a building consent.