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Christchurch City Council footer text Flood Taskforce Flood risk in Sumner and Moncks Bay.

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Presentation on theme: "Christchurch City Council footer text Flood Taskforce Flood risk in Sumner and Moncks Bay."— Presentation transcript:

1 Christchurch City Council footer text Flood Taskforce Flood risk in Sumner and Moncks Bay

2 1.Flood Taskforce purpose 2.Storm events 3.Vulnerability levels 4.Areas assessed 5.Temporary flood defence toolbox 6.Next steps 7.Questions Outline Eastern Terrace - April 2014 Squire Street - June 2013

3 Flood Taskforce purpose “ Assisting the most vulnerable homes to cope with the frequent flooding caused by the earthquakes”. Slater Street – June 2013

4 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

5 Storm events since 1961

6 Vulnerability Levels Three vulnerability Levels for multiple flooding occurrences since the earthquakes

7 Findings Areas investigated by Taskforce Identified number of households Vulnerability 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 10 Moncks Bay0 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

8 Flood Defence Toolbox

9 Christchurch City Council footer text Local Area Schemes for Wakefield / Paisley Area

10 Christchurch City Council footer text Wakefield Ave / Paisley St Area

11 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

12 Christchurch City Council footer text Mariner Street Area Cave Rock Drain Outfall Cave Rock Outfall Burgess Street Outfall

13 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

14 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

15 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)

16 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

17 Questions? Call Centre: Website:


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