Boulder Roll & Rockfall

Woy Woy

Located on a battle-axe block, the access drive for the site passed below a 6-7m high sandstone cliff with unstable boulders. The ground slope on either side of the driveway also had boulders and unstable ground.

A previously subdivided property / lot was located beside, and uphill of an access drive to a battle-axe block.  The lot was below a 6-7m high sandstone cliff that had many unstable boulders on, and above the cliff.  The ground forming the property also had many boulders and was susceptible to soil creep.

A proposal was put to the local Council to build on the lot adjoining the access drive;  the proposal was endorsed by a geotechnical engineer.  SCE, acting for the owner of the battle-axe property advised that there as was a serious risk of rock fall from the cliff, the residential development should not be approved.  Despite this advice, and a number of extended discussions between all parties, the development was approved by the Council.

Subsequently, and before the residential development was constructed, a large boulder [about 25 tonne] dislodged / fell and bounced over the lot, and caused significant damage to the access driveway to the battle-axe block.  During the rock fall, the boulder narrowly missed the owner of the battle axe block.

Since that time, no building works have been undertaken on the lot.

Boulder Roll & Rockfall | Shirley Consulting Engineers

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