Engineers Australia

An assessment of rockfall frequency for the coastal cliff lines of Pittwater Local Government Area, Sydney

Greg P. Kotze

Abstract

The Australian Geomechanics Society (AGS), in association with Pittwater Council, has performed an assessment of the likelihood of landslide occurrence throughout the Pittwater Council Local Government Area (LGA). Pittwater Council LGA has a significant coastline with the Tasman Sea of the southern Pacific Ocean. To complement the assessment of the frequency of earth slides, cut and fill failures and retaining wall instability, this study was conducted of the frequency of rockfalls from the near vertical, coastal cliff-lines.