Response to Information Request - MCU12/0184

                                          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



                                             Inditative Value of                                                                                                                              5:

                                            Approximlte AnnulI                                                                                                   5%               INSIGNIFICANT



A   -    ALMOST CERTAIN                              10-1                                                                                                         H                    Mor L(5)

B   -    LIKELY                                      10-2                                                                                                         M                           L


C   -    POSSffiLE                                   10-3                                                                                 M                       M                           VL


D   -    UNLIKELY                                    10-4                           H                            M                        L                        L                          VL


E   -    RARE                                        10-5                          M                             L                        L                       VL                          VL


F   -    BARELY CREDffiLE                            10-6                           L                           VL                       VL                      VL                           VL

        Notes:    (5)   For Cell A5, may be subdivided such that a consequence ofless 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


                                                                                            treatment. Extensive detailed investigation and research, planning and implementation of treatment
                                                                                     to reduce risk to Low; may be too expensive and not practical. Work likely to cost more than value ofthe


                                                                                                                                                                 treatment options required to reduce


                                                                                        in certain circumstances (subject to regulator’s approval) but requires investigation, planning and
             M                     MODERATE RISK                                    of treatment options to reduce the risk to Low. Treatment options to reduce to .Low risk should be


                                                                                         to regulators. Where treatment has been required to reduce the risk to this level, ongoing maintenance
             L                         LOW RISK


                                    VERY LOW RISK
                                                                    Acceptable. Manage by normal slope maintenance procedures.
             VL

         Note:    (7)   The implications for a particular sitnation are to be detennined 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