Funding for short-term flooding mitigation has been approved
by the Christchurch City Council.
The Mayoral Flood Taskforce has delivered its final report
about flood mitigation options that have been completed, are
underway or planned to help vulnerable households until
long-term solutions were decided.
Area-wide solutions and maintenance measures, designed to
mitigate flooding during heavy rain events, will be funded by
An additional funding increase of $1.75 million from $4.35
million to $6.1 million for the Tay Street drain pumping
station was also approved.
Taskforce leader John Mackie said the council's decision to
approve the planned works would help to minimise flooding
"The total cost of works completed, in progress or scheduled
is $10.7 million, bringing flood mitigation benefits to 65
percent of the most vulnerable households. Being able to
progress further work gives us additional measures to prevent
flooding in the hardest-hit areas of Christchurch."
Mr Mackie said while the solutions would benefit many
residents, some residents would not be protected by the wider
solutions and work was being done with other agencies on
funding individual house defences.
"We need to work with the Government and our other partner
agencies to identify potential funding avenues for house
tanking or raising. The individual solutions would act as
interim flood defence measures for these residents while
long-term options are investigated," he said.
"There's still work to be done on the longer-term measures
and the future costs"
Council asked staff to prepare a report on flooding issues in
the central city and potential defence options for
residential and commercial properties in this area.
The council was also supporting the establishment of
community flood defence plans, linking community groups and
organisations with metropolitan and civil defence planning.
The two long-term proposals for Dudley Creek would be
reassessed and the council would also review the floodplain
management options for the Lower Heathcote to be included in
the 2015 Long Term Plan and consider the possibility of
permanent or temporary relocation or retreat.
Work proposed and currently underway to mitigate flooding
- Major waterway channel widening and deepening.
- Temporary pumping solution in Flockton.
- Reinstatement of stop-banks in some areas.
- Installation of backflow prevention mechanisms on
- The repair of flap gates in the Avon and Heathcote
- Removal of sediment, vegetation and debris from
- Bridge and culvert removals.
- Raising the height of the sides of timbered drains.
- Installation of the Tay Street drain pump station,