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Short-term flooding solution for Southshore

Wednesday, October 11, 2017   Posted in: Resources and Information By: Administrator With tags: emergencies, prevention, water

Christchurch City Council Newsline: 10th October 2017

Flooded Southshore streets during recent flooding.Christchurch City Council has agreed on a short-term plan for protecting properties in an area of Southshore and South New Brighton vulnerable to tidal flooding.

At its meeting today the Council decided to build a bund in the area from Bridge Street to the South Brighton jetty as a short-term, temporary intervention to reduce the flooding risk south of Bridge Street, on the estuary side of Brighton Spit.

Early estimates suggest the construction cost will be between $500,000 and $600,000 but the exact cost will not be known until the detailed design work is done.

The Council has decided to defer consideration of extending the bund from the yacht club to the Jellicoe Marsh boardwalk until it has received the revised coastal hazards assessment report from Tonkin & Taylor and considered the regeneration strategy for the Southshore and South New Brighton area.

Council Land Drainage Manager Keith Davison says building a bund from Bridge Street to the South Brighton jetty should ease the flooding risk for a significant number of residential properties.

“The bund will provide a degree of protection for residents living in the area while we work through the longer term solutions,’’ Mr Davison says.

The risk of flooding in Southshore has been in the spotlight since July when heavy rain, coupled with a record high tide and storm surge, saw water top the estuary edge and flow through gaps in a grassed embankment created by Land Information New Zealand on red zoned land.

Some streets, garages and gardens in the area subsequently flooded, along with two homes.

The Council took emergency steps to protect vulnerable areas from the next high tide by raising the level of the embankment and building a bund. It has subsequently decided to spend about $1 million on stabilising the emergency bund to give it a design life of up to 20 years and allow time for planning and decisions on long-term options for the area.

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