Example of the Area Hazard Maps

Stability Hazard Legend

 

Planning Case Study

In the mid 1990's, Gosford City Council engaged Shirley Consulting Engineers to review the earlier maps produced internally by Council in the mid-1980's and to then undertake a formal identification of the various areas within the city area 'subject to landslip hazard'; this area encompassed six 1:25,000 scale CMA maps and extended from Wiseman’s Ferry to Kulnura, and from Patonga to Forresters Beach. The area also included Mangrove Mountain, Somersby, Umina, Koolewong, Gosford & Lisarow. The Council also requested that the study result in specific recommendations / guidelines as to methods of dealing with the identified hazards and a framework for the proposed development control plan [DCP] for areas affected by landslip hazard.

This major hazard mapping & planning study resulted in:

• detailed maps of the Gosford City Area at a scale of 1:25,000 which identified areas of potential landslip and rockfall; and
• policy recommendations which culminated in a new DCP [viz: DCP 163] for the Gosford City area.

The recommendations provided to Council embraced the Australian Geomechanics Society March 2000 Guidelines for Landslide Risk Assessment and provided a rational basis for the assessment of the content of geotechnical reports submitted to Council.