Cliffs and Steep Slopes


Kennedy Park Steps, Castor Bay

Kennedy Park-400
Input was provided to evaluate the risks affecting the previous beach access, and identify a suitable alternative route across steep slopes subject to erosion. This was followed by ground investigations along the selected alternative route and assessment of the most suitable founding construction for a proposed staircase across the cliff involving an unconventional solution for the challenging slopes. The end result is a picturesque and popular set of steps built within a steep challenging environment.

Clarks Beach Coastal Cliff Retreat

Torkar Rd 400
Retreat of the coastal cliff within the adjacent Council owned esplanade reserve was causing concern for residents who considered the erosion rate to have increased.  An investigation was undertaken and a methodology provided for the construction of a seawall and upper cliff protection.  The works included a rip rap seawall along the cliff base, and soil nailing and placement of mesh/mat on selected portions of the cliff.  Works were successfully completed in 2016.

Sharplin Falls Rockfall Risk Assessment

SharplinFalls 400
RILEY was involved in a rockfall risk assessment for the mid-Canterbury Sharplin Falls track in 2005, and again following the 2010 earthquake when the track was closed to the public due to a significant amount of loose rock above the track.  More recently, remediation options for the difficult terrain have been developed using a DOC avalanche risk assessment, when we undertook a semi-quantitative assessment to determine an appropriate fatality risk level for short-stop travellers.  From this, remedial options to reduce rockfall risk to an appropriate level, plus a preliminary costing to indicate the level of investment required were proposed.  To date the track remains closed while public consultation is undertaken.

Laucala Island, Fiji

Laucala 400
Geotechnical investigation, construction monitoring, and slope stability analysis for a Laucala Island resort. Work involved mapping of sea cliffs, undertaking a hazard assessment, and providing foundation recommendations.
Geotechnical mapping of joints within basalt agglomerate and assessment of safe slope angles and setback for foundations in volcanic tuff slopes.  Recommendations for building foundations on coastal alluvial deposits.

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