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Managing Council’s Road Network for Better Outcomes Storm Damage Experience

Managing Council’s Road Network for Better Outcomes Storm Damage Experience. Ian de Bruyne Manager Program Planning & Delivery IPWEA Regional Forum 15 May 2012. Council’s Road Network. Total Road Network Length 1791 km Sealed Roads 1020 km Gravel Roads 771 km

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Managing Council’s Road Network for Better Outcomes Storm Damage Experience

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  1. Managing Council’s Road Network for Better OutcomesStorm Damage Experience Ian de Bruyne Manager Program Planning & Delivery IPWEA Regional Forum 15 May 2012

  2. Council’s Road Network • Total Road Network Length 1791 km • Sealed Roads 1020 km • Gravel Roads 771 km • Collector Roads sealed 440 km • Collector Roads unsealed 54 km. • Local Roads sealed 580 km • Local Roads unsealed 717 km.

  3. Council’s Road network

  4. Council’s Road network

  5. Storm Damage • 240 storm affected sites • 140 of these are listed as landslips • 3 landslips categorised as severe • 26 landslips categorised as major • 100 sites on the road network were storm affected (washouts, pavement erosion, mud on road, fallen trees etc) • 24 gravel roads totalling 76km were damaged requiring resheeting

  6. March 2011 Storm Event

  7. Feb 2011 Rainfall Weather and factors leading up to the start of major landslips:

  8. March 2011 Rainfall Weather and factors leading up to the start of major landslips:

  9. February March 2011 Rainfall Total Feb & Mar 2011 rainfall of 332mm

  10. 13 Year Feb Mar Rainfall Profile

  11. Response • Erect barricades and warning signs to, make damaged roads safe for traffic . Fully or part closed roads which required major reinstatement work. • Cleaned up the debris along the affected roads, clean drains   • Engaged Consultants to carry out road safety audits on the landslip/storm affected roads who recommended further treatments in order to ensure the safety of road users. • Liaise and inspect storm damaged site with Vic Roads. Keep data base of damaged sites (use GPS camera) • Keep Public informed of extent of damage and plans for reinstatement – public meetings, letter drops, media releases, Council website.

  12. Storm Damage Cost • Estimated total cost for the reinstatement works is $11.4 million  • Landslip estimates cost $9.4 million • Resheet storm damaged roads $2 million • Request for 50% of the estimated cost as advance payment for the reinstatement works was made to the Treasury.  • Treasury funded an advance payment of $5.6million

  13. Recovery • Consultants engaged to investigate each of the severe and major landslip sites, prepare preliminary concept designs and estimates for proposed reinstatements • Continue monitoring progression of landslips and slumps  • Public meetings to keep the public of the issues and impending activities to reinstate damaged roads • Attend to minor reinstatements • Seek up front natural disaster funding from State Treasury • Tender for the repair of severe and major landslips

  14. Causes of Damage • Weather factors - cumulative and intense rainfall events • Fissured ground after long period of dry weather • Steep terrain • Steep dissected slopes (roads) • Slope stability • Reactive soils (montmorillonite, haloysite) • Soil moisture saturation • Inadequate table drain and under road culvert maintenance • tree litter, road debris

  15. Reinstatement Treatment Options • Landslips • Reinforced earth walls • Gabion walls • Extruded Polystyrene • Slumps • Reinforced earth walls • Gabion walls

  16. Extruded Polystyrene Treatment

  17. Gabion Wall Treatment

  18. Inadequate Drainage Maintenance

  19. Gabion Wall

  20. Extruded Polystyrene

  21. Gabion Wall

  22. Reference • "A Study of Landslides and their Relation to Engineering and Planning in the Southern Districts of the Narracan Shire, Victoria (1979)“ • Examines the nature and distribution of landslides, the properties of the soils involved and the factors responsible for slope instability. • Provides suggestions for mitigating the existing and potential landslide hazards. • Study undertaken by J.C. Brumley of the former Department of Minerals and Energy in 1978. Final report was prepared as part of an Unpublished Report series http://vro.dpi.vic.gov.au/dpi/vro/wgregn.nsf/pages/wg_landwtrmgmt_degrad_narracan

  23. Learnings from our Experience Maintenance Regularly maintain, especially during the drier seasons: • Table drains and under road culverts • Road shoulders • Remove tree litter not only in table drains or road shoulders but also on slopes on the high side of the road • Use GPS cameras to record damage Communications • Meet with communities or people affected by the damage • Issue regular status and progress updates. • Keep Council informed of progress or blockages

  24. End Thank you for your attention Any Questions?

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