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Flood Taskforce. Flood risk in Sumner and Moncks Bay. Outline. Flood Taskforce purpose Storm events Vulnerability levels Areas assessed Temporary flood defence toolbox Next steps Questions. Eastern Terrace - April 2014. Squire Street - June 2013. Flood Taskforce purpose. - PowerPoint PPT Presentation
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Flood TaskforceFlood risk in Sumner and Moncks Bay
1. Flood Taskforce purpose2. Storm events 3. Vulnerability levels4. Areas assessed5. Temporary flood
defence toolbox6. Next steps7. Questions
Outline
Eastern Terrace - April 2014
Squire Street - June 2013
Flood Taskforce purpose
“ Assisting the most vulnerable homes to cope with the frequent flooding caused by the earthquakes”.
Slater Street – June 2013
Which areas were covered by the Flood Taskforce?• Lower Avon River • Dudley Creek (including Flockton)• Lower Heathcote (including Woolston/Opawa)• Upper Heathcote• Heathcote Valley • Southshore • Sumner (including Redcliffs)• Little River• Lyttelton
Storm events since 1961
Vulnerability Levels
• Three vulnerability Levels for multiple flooding occurrences since the earthquakes
Findings
Areas investigated by Taskforce
Identified number of householdsVulnerability Level since the earthquakes
1 (multiple floods in
the home)
2 (multiple
floods under the home)
3 (access cut
from the home repeatedly)
Sumner Village 0 1 0
Moncks Bay 0 0 0* Properties identified in the May 2014 Taskforce Report by Customer Service Requests; flood modelling confirmed by visual inspections.
Note: 7 properties recorded as flooded above floor level once since earthquakes
Flood Defence Toolbox
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Local Area Schemes for Wakefield / Paisley Area
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Wakefield Ave / Paisley St Area
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Wakefield Ave / Paisley St Scheme
Phase 1 Recommendations
• Removal of sediment from Sumner Stream
• Increase inlet and pipe capacity of sumps outside 125 Wakefield Ave
• Liaise with CERA to mitigate both short and long term sediment and runoff issues from Red Zone
• Van Asch St bridge being replaced by SCIRT
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Mariner Street Area
Cave Rock Drain Outfall
Cave Rock Outfall
Burgess Street Outfall
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Richmond Hill Drain / Mariner St Area
Phase 1 Recommendations
• Investigate options for improved outfalls at Cave Rock and Burgess St to to mitigate operational issues related to sand
• Formalisation of the secondary flow path from Cave Rock Drain outfall (surf club)
• Prepare specific operational and emergency response plan to document critical requirements for operation of the system
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Other Recommendations
• Undertake immediate maintenance on SFRP flap gate to ensure fully operational
• Investigate options for providing ability to manually open SFRP flap gate
• Reinstate bolts on SFRP manholes
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Other Recommendations
• Assess sediment levels and programme removal sediment and other constrictions from Sumner Main Drain between Truro and Colenso streets
• Monitor sediment levels in SFRP once flap gate operational and programme cleaning if required
• Cleaning out road side swale on Heberden Ave / Arnold St intersection to reduce runoff across road, possible footpath improvements same area to minimise runoff into private property (36a Heberden Ave)
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Next steps
Flood Taskforce• Ongoing maintenance activities• Further investigations for solutions• Flooding recommendations delivered to Council and
government
Residents• Complete a survey• On-going contact• One-on-one meetings with engineers if a solution affects
your property
