flood taskforce
DESCRIPTION
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 PresentationTRANSCRIPT
Christchurch City Council footer text
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
Christchurch City Council footer text
Local Area Schemes for Wakefield / Paisley Area
Christchurch City Council footer text
Wakefield Ave / Paisley St Area
Christchurch City Council footer text
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
Christchurch City Council footer text
Mariner Street Area
Cave Rock Drain Outfall
Cave Rock Outfall
Burgess Street Outfall
Christchurch City Council footer text
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
Christchurch City Council footer text
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
Christchurch City Council footer text
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)
Christchurch City Council footer text
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
