Download presentation
Presentation is loading. Please wait.
Published byEduardo Topp Modified over 10 years ago
1
IT’S IN THE EYE OF THE INSPECTOR Overview of visual inspection methods in four countries and lessons learned ISFD4, Toronto 6 May 2008 Jaap Flikweert
2
Background Based on study for NL Research programme ‘Inspection of flood defences’ (VIW) (STOWA & Rijkswaterstaat) Co-author: Gerard Moser Sources: n Personal involvement in NL & UK n Literature study & interviews for FR & DE
3
Lay out of presentation Why inspect? Role of visual inspection Local context Methods Conclusions on effective use of visual inspection
4
Asset management Flood risk management Risk-based asset management Balancing risk, cost and performance Why inspect? To measure deterioration To steer intervention To improve performance To reduce risk graphic: Advantica Ltd.
5
Asset Inspection Parallel with human health
6
Asset inspection Visual, intrusive, remote Judgement, guidance, calculation Tradition, performance based
7
Role of visual inspection Drivers for developments: n Defences protect more n More complicated structures n Professionalisation n Technological development Why still visual inspection? n Use of local knowledge n Cost n Human factor n Emergency staff available
8
Local context
10
Netherlands: Flood risk dominant, defences vital, long history Strict legal framework, flexible application Focus on meeting standards Assets managed by professionals Germany (Federal waterways): Flood risk significant, defences very important Strict procedures Focus on preventing damage Assets managed by professionals England: Flood risk significant, increasing profile, defences locally important Permissive powers, strict procedures Focus on cost-effectiveness and risk Assets managed by professionals France: Flood risk significant, defences locally important Guidance Focus on introducing defence management Varying but improving quality of asset management Scale of flood risk Rules Focus Organi- sation
11
Methods Long tradition of visual inspection Recent years: less embedded in asset management
12
Methods Why: Identify & repair small defects Limited link with asset management under development How: No detailed rules, left to local judgement Guidance under development Who: Operational staff Recent development: training available
13
Methods Focus on Federal waterways Framework: n DIN flood embankments n Specific internal directive for inspection Clear hierarchical structure: n Inspector: inspect and inform n Field officer: check, respond and inform n Asset manager: check and respond Indicators are asset specific & failure mode related
14
Methods Why: Identify defects, prevent breach How: Detailed roles Asset specific indicators Who: Specialist full-time inspectors Backed by experts
15
Methods Since mid 90s: Condition Assessment Manual: n Condition grade (1-5) n Nationally consistent n Indicator for performance Developments: n Improve link with failure modes
16
Methods Why: Keep track of deterioration Measure maintenance quality How: Detailed prescribed roles Systematic technical guidance Who: Operational staff with specific training
17
Methods Longer tradition of dam management, but flood defence management just starting Opportunity for integrated approach: n Performance based n Inspection embedded in asset management Guide pratique (Cémagref): n Procedures n Set of forms
18
Methods Why: Identify defences and determine starting point Move toward keeping track of deterioration How: General guidance on approach Can be applied to set local indicators Who: Variable, depends on asset management organisation
19
Conclusions n Each country / culture its own method n Visual inspection can have different purposes n General move toward performance based inspection n Specific role for visual inspection within overall inspection, given technological developments: n Taking the pulse n Trigger for expert inspection n Input for modelling
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.