Slope Stability Report · EXE22/0013

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 CONSEQ JENCES TO PROPERTY (With data Aunemaie tt of Menino
Indicative Value of 1: CATASTROPHIC
Approximate Annual 200% 5 INSIGNTFIC ‘ANT
OS%

 

 

 

 

 

UNLIKELY L L VL
- RARE L VL VL
F - BARELY CREDIBLE 10* L VL VL VL VL
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

 
 
   
     
  
 

 
 

Example Implications (7)
Unacceptable without treatment. Extensive detailed investigation and research, planning and implementation of treatment
options essential 10 reduce risk to Low, may be too expensive and not practical. Work likely to cost more than value of the
woperty
Unacceptable without treatment. Detailed investigation, planning and implementation of treatment options required t reduce
risk to Low. Work would cost a substantial sum in relation to the value of the property

May be tokrated in certain circumstances (subject to regulator’ s approval) but requires investigation, planning and
MODERATE RISK implementation of treatment options reduce the risk to Low. Treatment options reduce to Low risk should be
implemented as soon as practicable

Usually acceptable to regulators. Where treatment has been required reduce the risk to this level, ongoing maintenance is
required. |
‘Acceptable Manage by normal slope maintenance procedures |

   
  

   

 

LOW 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