SCHEDULE 3 – DEFECT RISK MANAGEMENT RANKING
Maroondah City Council RMP v6
The levels of service required for assets specified in the Plan have been developed using the risk
framework provided in AS/NZS ISO 31000:2009 Risk Management – Principles and Guidelines.
The tables below are from AS/NZS ISO 31000:2009 Risk Management – Principles and Guidelines.
They provide for an assessment of the likelihood of an event occurring against the consequence and
have been used to develop the comparative risk rating for specific defects associated with Council’s
assets in order to establish maintenance priorities and desired levels of service.
Consequences
1
Insignificant
2
Minor
3
Moderate
4
Major
5
Catastrophic
High
High
Extreme
Extreme
Extreme
Medium
Medium
High
Extreme
Extreme
Low
Medium
High
Extreme
Extreme
Low
Low
Medium
High
Extreme
Low
Low
Medium
High
High
Likelihood
A
Certain
B
Likely
C
Possible
D
Unlikely
E
Rare
Risk Analysis Matrix
Extreme risk, detailed investigation and immediate action required.
High risk, senior management attention required, detailed investigation and action where practicable.
Medium risk, management responsibility must be specified, assessment of risk and management of
issue through works or on-going monitoring.
Low risk, manage by routine procedures, does not require immediate attention but requires assessment
and on-going monitoring.
Level
Descriptor
Probability Description
A
Certain
Is expected to occur in most circumstances
B
Likely
Will probably occur in most circumstances
C
Possible
Might occur at some time
D
Unlikely
Could occur at some time
E
Rare
May occur only in exceptional circumstances
Measures of Likelihood
Rating
Descriptor
Description
1
Insignificant
No injuries, low financial loss
2
Minor
3
Moderate
4
Major
5
Catastrophic
First aid treatment, medium financial loss
Medical treatment, required, high financial loss
Extensive injuries, major financial loss
Death, huge financial loss
Measures of Consequence
Maroondah City Council RMP v6
As some assets may contain multiple defects, it is important to understand the relative defect ranking, to
determine which defect is the highest priority, based on the comparative risk. The table below highlights
the comparative risk between the different defects for each asset group, based on Council’s Risk
Analysis Matrix.
ASSET GROUP
ASSET
SURVEILLANCE
MANUAL
SECTION
DEFECT TYPE
LIKELIHOOD
CONSEQUENCE
RISK
RATING
-
Potholes
Possible
Major
-
Vertical Movement (Heaving,
Lips or Depressions)
Possible
Moderate
-
Accumulated Debris
Possible
Major
-
Damaged Local Area Traffic
Management (LATM) Devices
Possible
Moderate
High
-
Edge Breaks
Possible
Moderate
High
-
Edge Drop-Offs
Possible
Moderate
High
-
Edge Breaks
Possible
Moderate
High
-
Edge Drop-Offs
Possible
Moderate
High
(Carparks And Right
Of Way – Formed
And Sealed)
-
Potholes
Possible
Moderate
High
ROADS
-
Vertical Movement (Heaving,
Lips or Depressions)
Possible
Moderate
High
-
Edge Drop-Offs
Possible
Moderate
High
-
Pothole
Possible
Moderate
High
-
Vertical Displacement (Heaving,
Tilting or Depressions)
Possible
Moderate
High
-
Vertical Displacement (Heaving,
Tilting or Depressions)
Likely
Moderate
High
-
Vertical Displacement (Lips)
Likely
Moderate
High
ROADS
(All Roads – Formed
And Sealed)
ROADS
(Roads, Carparks
And Rights Of Way –
Formed And Sealed)
Extreme
High
Extreme
ROADS
(Roads, Carparks
And Rights Of Way –
Formed And
Unsealed)
PATHWAYS
(Hierarchy 1 & 2)
PATHWAYS
(Hierarchy 3 & 4)
PATHWAYS
(Hierarchy 3 & 4)
Maroondah City Council RMP v6
ASSET GROUP
ASSET
SURVEILLANCE
MANUAL
SECTION
DEFECT TYPE
LIKELIHOOD
CONSEQUENCE
RISK
RATING
-
Pothole
Possible
Moderate
High
-
Piece/Paver Missing
Possible
Moderate
High
-
Tactiles
Possible
Moderate
High
-
Blocked Table Drains
Possible
Moderate
High
-
Damaged Stormwater
Pits/Structures
Possible
Moderate
High
-
Obstruction
Possible
Minor
Medium
-
Insecure Mounting
Possible
Minor
Medium
-
Sign Illegible
Possible
Minor
Medium
-
Facing the Incorrect Way
Possible
Minor
Medium
PATHWAY
FEATURE
-
Feature Damaged
Possible
Moderate
High
GUIDE POSTS
-
Guide Post Damaged
Possible
Moderate
High
GUARD RAIL
-
Damaged Guard Rail
Possible
Moderate
High
VEGETATION
-
Overhanging Vegetation
Possible
Minor
DEAD ANIMAL
REMOVAL
-
Dead Animal Removal
Possible
Moderate
PATHWAYS
STORMWATER
DRAINAGE
SIGNS
SIGNS
(Regulatory and
Warning signs, and
poles)
Maroondah City Council RMP v6
Medium
High