Development Application Part 2 of 2 - Plans 7 Banksia Avenue Noosa Heads · OPW10/2120

                                         PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007
                                                                 APPENDIX C: LANDSLIDE RISK ASSESSMENT
                                      QUALITATIVE TERMINOLOGY FOR USE IN ASSESSING RISK TO PROPERTY

   QUALI7A17IVE MEASURES OF LIKELIHOOD

Appruxiinate Annual Probability
                                                 Implied Indicative Landslide
 Indicative            Notional                      Recurrence Interva l                                              Description                                           Descriptor               Level
  Value               Bouudaly
    10                   5 i 102                  10 ears                                The event is expected to occur over the design life.                          ALMOST CERTAIN                   A
                                                                      20 years           The evert{ will probably occur under adverse conditions over the
    I0 `                                         100 years                                                                                                             LIKELY                           II
                                                                                         design Inc.
                                                                                                  f
                         Sx10 '                                      200 years
   1Q         _                                  1000 ourA                               The event could occur under adverse conditions over the design life.          POSSIBLE                         C
                         5x19 ^          _            y              2000 veers
                                                                                         The event might occur under very adverse c;rci ristances over the
   1Q t                                         10,ooo years                                                                                                           UNLIKELY                         D
                                 -'                                                      design life.
                         Sx]G                                        20,000 years
   lU-'                                                                                  The event is conceivable but only under exceptional circumstances
                                               100.000 years                                                                                                           RARE                             T
                                                                                         over the design life.
   IQ _,                 5x 1 0                                      200,000 veers
                                              1.000 000 years                            the event is inconceivable or fanciful over the design life.                 BARELY CI EDIBLE                  F
   Note:      (1)   The table should bo used from loft to right; use Approximate Annual Probability or Description to assign Descriptor, not vice versa.


   QTIA1.17ATIVP. MEASURES OF CONSEQUENCES TO PROPERTY

 Approximate Cost of Damage
                                                                                                Description                                                                  Descriptor               L eve l
Indicative            Notional
  Value               Boundary
                                             Stricture(s) completely destroyed and/or large scale damage requiring major engineering works for                                    ,
  20Ct9'o                                                                                                                                                             CA'fA5'f1LU1 hl1C                  1
                                             stabilisation. Could cause at least one adjacent proporty major consequence damn e.
                       100 1/0
                                             Extensive dmnage to most of structure, and/or extending beyond site boundaries requiting significiinI                                                      2
   60%                                                                                                                                                                MAJOR
                                             stabilisation works. Could cause at least one adjacent rort medium conve uencc dania •c.
                        '10%
                                             Moderate damage to some of structure, and/or significant part of site requiring large stabilisation works.                                                 3
   20%                                                                                                                                                                MEDIUM
                                             Could cause at least one adjacent propccty minor consequence damn ge.
                         10%                                                                                                                                                                            4
   5%                    lobo                Limited damage to rt of structure, and/or part of site requiring some reinstatement stabilisation works.                 MINOR
                                             Little damtage. (Note for high probability event (Almost Certain), Ili is category may he subdivided at a                                                  5
  0 5,                                                                                                                                                                INSIGNIFICANT
                                             notional boundary of 0.1%. See Risk Muhi.x.)
   Notes:     (2)   The Approximate Cost of Damage is expressed as a percentage of market value, being the cost of file improved value of the unaffected property which includes the land plus the
                    mnat'iitcied struchuas.
              (3)   The Approximate Cost is to be an estimate of the direct cost of the damage, such as the cost of reinstatement of the damaged portion of the property (land plus structures), stabilisation
                    woii:s required to render the site to tolerable risk level for the landslide which has occurred and professional design fees, and consequential costs such as legal fees, temporary
                    aecurntnodalion. L does not include nddilional stabilisation works to address other landslides which may affv t the property.
                    'I'hc table should be used from left to right; use Approximate Cost ofDaniage or Description to assign Descriptor, not vice versa


  91                                                             Australian Geornechanics Vol 42 No 1 March 2007