MCU14/0024 - Response to Information Request - Attachment 3

APPENDIX C; LANDSLIDE RISK ASSESSMENT

OUALITATIVE MEASURES OF LIKELIHOOD

PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007

QUALITATIVE TERMINOLOGY FOR USE IN ASSESSING RISK TO PROPERTY

 

Appretimate Aneual Probability

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

   
 

 

  

 

Implied Indicative Landslide a :
Indicative Notional Recurrence Interval Pa ennai =
Value Boundary
107 5x10? 10 years ae The avemt is expected to occur over the dezign life ALMOST CERTAIN A
10? - 100 years ea toaeT The event will probably occur under adverse condoms over the [yp peeyy 3
. = design bie =a
oo are rs
10” oo : 1000 years = pi The evemt could occur under adverse condition: over the design life | POSSIBLE Cc
10+ 5210 10.000 year: The event might occur under very adverse cocumetances over the | 5.2, + n
a aetna 20,000 year; [Seen ee a :
10° 5210 a ae or tees The event js conceivable Dut only under excephonal cincumstance: =
100,000 vears gis tibdsicn He RARE E
° 0.020 vears + = — -- =
107 =e Toooood yams | 22M8 vers [The event is meoncelvable of fauciful over the design life. BARELY CREDIBLE F
Note: (1) The table should be used from left vo nghr, use Approwimate Acmual Probability or Description to assign Descriptor, not vice versa
QUALITATIVE MEASURES OF CONSEQUENCES TO PROPERTY
Approximate Cost of Damage
elisa Notional Description Descriptor Level
Value Boundary
200% sarucsara(s) completely destroyed and or large scale damage requiring major enzineering works for CATASTROPHIC L
a 100" tian. Could cause at least one adjacent property major consequence damage Se aet errs |
60% al ve damage to mos of structure, and or extending deyond ste boundanes requimng sigmficant MAJOR a
ia stabilisation works. Could caase at least one adjacent property medium consequence damage. 7
% eae Moderate damage wo tome of sracture, and or significant part of site requiring large stabilisation works x
20% MEDIUM 3
ie Could cause at least one adiacent property minor consequence damage.
3 " Lamited damage to part of structure. and or part of site requ:ring some reinstatement stavikseton works MINOR, 4
os 7 Little damage Qvote for high prosatility event (Almost Certain), this category may be subdivided at a INSIGNIFICANT -
oe notions! Doundary of 0.1%. See Risk Matrix.) oe ee m
Notes: (2) The Approximate Cost of Damage is expressed a5 2 percentage of market value, being the cost of he improved value of the unaffected propery which inchides the land plus the
unafected structures.
G) wouiniate Cost is to be an estimate of the direct cost of the damage. such a: the cost of reinstatement of the damaged pordon of the property (land plus structures), szabiluanen
noted to tender the site to tolerable risk level for the landslide which has occurred and prowessional design fees, and consequential costs iuch as jezal fees, temporary
omemodation. it does not mchude addtronal sabiksation works to address other landslide: whach may affect the property.
Sy table should be weed from left w might: use Approximate Cost of Damage or Descnpcion to assign Descriptor, not vice versa
ot Australian Geomecmanics Vel 42 No 1 March 2007