Institute Public Works Engineering Australia NAMS.AU CONDITION ASSESSMENT OF SWD ASSETS PETER WAY PSM CHAIR NAMS.AU

Transcription

1 Institute Public Works Engineering Australia NAMS.AU CONDITION ASSESSMENT OF SWD ASSETS PETER WAY PSM CHAIR NAMS.AU

2 Practice Notes for Condition Assessment SWD is PN 5 of series Guidelines to foster a National approach Peer review process Acknowledge enormous industry support

3 Scope of SWD Guideline All hard infrastructure elements Excludes WSUD elements All material types

4 Purpose of the Guideline Up to date Register of SWD System/Components Condition assessment Risk analysis Report on valuation, depreciation Work Schedules and Construction Programs Long Term Financial Planning

5 Condition Assessment What s involved? Desk top surveys Assess current condition vs desired LoS Short-term maintenance and longer-term renewals Priority rank work based on risk analysis Confirms asset inventory, estimation of remaining useful life, depreciated replacement cost

6 Some Prior Considerations Understand function of SWD Assets Flooding mitigation Protect property, community health, safety Protect environment

7 Some Prior Considerations Level of service provided Meet legislative requirements Suit community need Affordable Sustainable

8 Risk and Criticality AS/NZS ISO Failure Modes Flooding Hazards to traffic Hazards to community Property, infrastructure, environmental damage

9 Distress Modes Various Components Structural Cracking Fracture Displaced Joint Surface damage Collapse Serviceability Silt/debris Corrosion Root intrusion Obstructions

10 Criticality Rating Table CR 1 to 5 1 is least significance 5 is most disruptive and expensive Factors assessed Location surrounding built environment Transport corridors Pipe size and depths Suggested inspection frequency

11 Failure Probability Factors Age of components Material types Environmental marine, acid sulfate Trees Construction practices

12 Information Management Organisation needs driven Data capture options Time Cost Confidence Pilot Studies Integrate with corporate systems

13 Rating System for SWD Condition 0 or 1 (As new) to 5 (Very Poor or failed) Table describes -Structural & Serviceability Derived from IIMM and WSAA Code Responses suggested Estimated residual life -% design life Appendices of photos for each Grade

14 Sources of Data Collection Complaints/Requests Formal Inspections Staff reporting Utility providers/developers Advanced data collection techniques

15 Inspection Process Pre-inspection data packs Operator/Inspector role Inspection frequency O H & S Survey Data Management

16 Data Analysis Key Outcomes expected: Updated SWD Asset register Condition rating of each component and estimate of remaining useful life. Depreciated Replacement Cost (DRC) valuation and Current Replacement Cost Timing of future renewals/replacements Work schedules (maintenance) & Capital Works Programs Long term financial plan - funding needs.

17 Expenditure Profile Report

18 Work Schedules and Programs Reactive Maintenance works orders Pro-active maintenance planning Capital Expenditure Renewals and Replacement New Construction Improvement Plan Link to corporate plan Gap analysis

19 Conclusion Written by Practitioners for Practitioners Living Document Order through IPWEA Practice Notes