Slope Stability Report

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 CON: SEQUENCE ES TO PROPERTY (With Indicative Approximate Cost of Demey)
Indicative Value of 1: CATASTROPHIC : MAJOR 3: MEDIUM 4: MINOR
Approximate Annual 200% 60% 20% 5% IN! SIGNIFIC ANT
Probability 0.5%
A - ALMOST CERTAIN 107 H MorL (5)
B - LIKELY 107 M L
C - POSSIBLE 107 M VL
D - UNLIKELY 10+ L VL
E - RARE 10° M L L VL VL
F - BARELY CREDIBLE 10* L VL VL VL VL

 

 

 

 

 

 

 

Notes: (5) For Cell A5, may be subdivided such that a consequence of less than 0.1% is Low Risk.
© When considering a risk assessment it must be clearly stated whether it is for existing conditions or with nsk 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 m relation to the value of the property.

 

M MODERATE RISK

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

 

L LOW RISK

Usually acceptable to regulators. Where treatment has been required to reduce the nsk to this level, ongoimg maintenance is
required.

 

 

 

VL VERY LOW RISK

 

Acceptable. Manage by normal slope maintenance procedures.

 

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 nsk: these are only

given as a general euide.

Form No. 68039 RL2 August 2010

Australian Geomechanics Vol 42 No 1 March 2007