Flood-prone Canterbury rivers in the spotlight
By David Hill, Local Democracy Reporter
Lessons learned from devastating floods in May 2021 are helping shape planning for Canterbury’s rivers.
Environment Canterbury (ECan) is proposing to invest $25 million a year, over the next 10 years, to boost flood protection as part of its draft 2024-34 long-term plan (LTP).
While flooding caused by Cyclone Gabrielle in Hawke's Bay last year attracted headlines, Canterbury has had its own damaging floods in recent years.
In 2019, the Rangitata River bridge was closed for several days following a flood, while the May 2021 flood caused widespread disruption, prompting a rethink of how ECan manages its river systems.
"A Cyclone Gabrielle event hasn’t happened, as far as we know, in Canterbury’s history, but one-in-200 year events seem to be happening more and more,’’ said councillor Ian Mackenzie, who chairs the council’s catchment resilience committee.
"Nobody is immune to being impacted by flood events."
The 2021 flood event showed the old river and drainage rating model was no longer fit for purpose, as rivers need to be looked at as a whole river system, he said.
To ensure the financial burden is spread across the region, the council is seeking to introduce a mix of district-wide and region-wide rating.
Without the council’s flood protection, land drainage and erosion control schemes, staff estimated there would be about "$9 billion per year of combined damages and lost earning potential would be felt".
Canterbury has about half of New Zealand’s river assets, with the regional council having oversight of 58 river schemes.
Flood protection work is urgently needed in the Waimakariri district, the council’s operations general manager, Leigh Griffiths, said.
Changes to the landscape caused by the growing urban environment and the 2010 and 2011 earthquakes meant "the level of flood protection is lower than would be expected", she said.
About $700,000 a year is spent on maintenance in the Ashley-Rakahuri River, with the council proposing to increase that to $800,000 per year and to initiate an eight-year, $15m upgrade programme as part of the LTP.
The work, for which the council will seek central Government funding, is likely to be similar to work planned in the Selwyn district.
Christchurch, Kaiapoi and part of the Selwyn district are protected by two levels of flood protection on the Waimakariri River, which has capacity for a one-in-500 year event.
It costs about $5m a year, with $1m coming from a targeted rate of $12 per ratepayer, per year.
The balance is funded by income from grazing and forestry on council-owned land between the stopbanks.
The capacity in some South Canterbury rivers means they "are expected to overtop their stopbanks" in a one-in-50 year flood event, while Ashburton is protected for a one-in-200 year event.
The proposed Selwyn district flood prevention work will be funded by a district-wide targeted rate and will include clearing out channels and flow paths, weed control and planting, and building resilience.
Exotic weeds, including poplars and willows, and loose shingle poses the biggest challenges, Mackenzie said.
"Bridges are more likely to survive if they’re not being treated as a battering ram [in a flood].
"Exotic weeds are one of the biggest problems.
"If we stopped doing what we do these exotic weeds would choke rivers and push them out to the berms."
■ LDR is local body journalism co-funded by RNZ and NZ On Air.
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New Amberley cricket ground gets green light
By David Hill, Local Democracy Reporter
Amberley is set to get a new cricket ground, despite some community opposition.
The Hurunui District Council approved plans to allow the development of the Amberley Village Green (formerly Eastern Reserve), to the east of the town centre, which will include a cricket ground, at a council meeting on Tuesday, November 26.
Around 120 submissions favoured the development of recreation in the reserve over a cricket ground, during the council’s recent reserve management plan consultation.
At Tuesday’s meeting, councillors approved a plan to install an irrigation system, with water sourced from a submersible bore pump.
Staff have been authorised to tender for the development of a playing surface, excluding the wicket block which will be developed by the Amberley Cricket Club.
A pathway around the perimeter of the reserve and public toilets will also be developed.
A cricket ground was first mooted for the reserve a decade ago when the land was set aside by the developer.
A budget of about $900,000 has been set aside, with 90% from development contributions.
An updated concept plan tabled at the meeting makes provision for other sports and activities such as basketball, a scooter track, a playground and car parking.
Several councillors expressed reservations about the proposed size of the cricket ground.
Councillor Garry Jackson said proposed the cricket ground was close to international standard and could be reduced by 20 percent and still be ‘‘appropriate as a village green club cricket ground’’.
While she acknowledged Jackson’s concerns, councillor Pauline While said the council needed to move forward, and councillor Fiona Harris said the cricket club had been ‘‘patient for long enough’’.
Councillor Robbie Bruerton said ‘‘it is being talked about as if it is only going to be used for cricket, but it can by used for any sport’’.
Councillor Vanessa McPherson voted against the proposal as she said the process had been ‘‘undemocratic’’ in the beginning.
‘‘I am concerned there is not enough funds for a decent children’s playground. I am angry and frustrated by this. It is so unfair.’’
Earlier in the meeting Amberley ratepayer John Weyers urged councillors to vote against establishing another cricket ground.
He said cricket is already being played at the Amberley Domain and ‘‘there is no reason why cricket and football cannot co-exist’’.
While there had been a dispute between the cricket and football clubs, he believed it has now been resolved.
‘‘Amberley is growing and we have an ageing population and a growing number of young families, but we are lacking spaces for recreation.’’
Councillors noted there has been confusion about the name of the new reserve, between the Village Green and the Eastern Reserve.
Council chief executive Hamish Dobbie said ‘‘Village Green’’ was the name put forward by the council’s south ward committee.
Dobbie said the council’s reserve management plan will be presented to councillors at a future meeting for adoption.
■ LDR is local body journalism co-funded by RNZ and NZ On Air.
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