220200 - 27 Adams Street, SUNSHINE BEACH - Slope Stability Report · EXE22/0017

PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007
APPENDIX C: — QUALITATIVE TERMINOLOGY FOR USE IN ASSESSING RISK TO PROPERTY (CONTINUED)

QUALITATIVE RISK ANALYSIS MATRIX — LEVEL OF RISK TO PROPERTY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LIKELIHOOD CONSEQUENCES TO PROPERTY (With Indicative Approximate Cost of Damage)
Indicative Value of 1: CATASTROPHIC 2: MAJOR 3: MEDIUM 4: MINOR 5:
Approximate Annual 200% 60% 20% 5% INSIGNIFICANT
Probability 0.5%
A — ALMOST CERTAIN 107
B - LIKELY 107
C - POSSIBLE 10°
D - UNLIKELY 10"
- RARE 10°
F - BARELY CREDIBLE 10°
Notes: (5) For Cell AS, may be subdivided such that a consequence of less than 0.1% is Low Risk.
(6) | When considering a risk assessment it must be clearly stated whether it is for existing conditions or with risk control measures which may not be implemented at the current
time.

RISK LEVEL IMPLICATIONS
Risk Level

 

   
 
  
  
    

Example Implications (7)

Unacceptable without treatment. Extensive detailed investigation and research, planning and implementation of treatment
options essential to reduce risk to Low; may be too expensive and not practical. Work likely to cost more than value of the
property.
Unacceptable without treatment. Detailed investigation, planning and implementation of treatment options required to reduce
|_risk to Low. Work would cost a substantial sum in relation to the value of the property.
May be tolerated in certain circumstances (subject to regulator's approval) but requires investigation, planning and
implementation of treatment options to reduce the risk to Low. Treatment options to reduce to Low risk should be
implemented as soon as practicable.
Tanne Usually acceptable to regulators. Where treatment has been required to reduce the risk to this level, ongoing maintenance is

required.
Acceptable. Manage by normal slope maintenance procedures.

 

MODERATE RISK

 

 

VERY LOW RISK

 

 

 

Note: (7) The implications for a particular situation are to be determined by all parties to the risk assessment and may depend on the nature of the property at risk; these are only
given as a general guide.

92 Australian Geomechanics Vol 42 No 1 March 2007