The estimated cost of protecting Lower Hutt from a catastrophic flood has climbed to more than half a billion dollars, leaving Greater Wellington facing a $184.9 million funding gap and arguing local ratepayers should not be expected to carry the cost alone.
Greater Wellington has revised the flood protection component of Te Wai Takamori o Te Awa Kairangi, formerly known as RiverLink, to $535.4 million.
Current Long Term and Annual Plan budgets provide $350.6 million, leaving the regional council searching for substantial additional funding as it continues discussions with the Government.
Despite the increase, Greater Wellington says the project remains essential because it will protect thousands of people and homes alongside critical regional and Crown infrastructure.
Billions of dollars of infrastructure at risk
Greater Wellington Deputy Chair Ros Connelly says Te Wai Takamori o Te Awa Kairangi is among the country’s most important flood protection projects.
The programme is intended to protect Lower Hutt’s CBD, Hutt Hospital, schools, electricity and three waters infrastructure, local roads, State Highway 2, the rail corridor and other major public assets.
At the heart of the programme is protection against a one-in-440-year flood, calculated as having a 0.23 percent chance of occurring in any given year.
While that annual probability may appear small, the consequences of such an event across one of New Zealand’s most densely populated floodplains could be enormous.
Greater Wellington’s argument is that the project therefore cannot be considered simply a Lower Hutt infrastructure project.
Why has the cost increased?
The regional council says the new figure reflects a much more developed understanding of the engineering, risks and construction requirements.
Factors include changes to transport and bridge designs, construction inflation, rising utility costs and the complexity of multiple major projects being delivered within the same constrained corridor.
Additional costs have emerged through relocating a sewer main alongside State Highway 2.
The river also needs to be moved to achieve the flood protection standard required around the City Link pedestrian and cycling bridge.
Further land has been required for construction of the Mills Street stopbank and new Melling railway station.
Greater Wellington points to the Melling Transport Improvements as an example of how estimates for major infrastructure can change as projects mature, with that project’s budget increasing from $420 million in 2021 to $1 billion in 2025.
Ratepayers shouldn’t carry national costs alone
The emerging political question is who should pay the additional $184.9 million.
Flood protection is currently funded through general regional rates alongside a targeted Lower Hutt rate.
Greater Wellington believes that funding model does not adequately recognise the national assets being protected.
The council is now in discussions with ministers and government agencies about possible co-funding arrangements.
Its case is that Lower Hutt ratepayers should not be left paying for infrastructure that protects Crown assets and nationally important transport, health and utility networks.
No decision on a new funding arrangement has yet been made.
Cost-cutting effort underway
Greater Wellington says it is simultaneously looking for ways to reduce the final bill.
That includes reusing construction materials, improving the sequencing of work, reducing disposal costs through gravel reuse, commercial negotiations and continuing to reassess programme risks and assumptions.
Connelly says the council remains focused on controlling expenditure without compromising the flood protection Lower Hutt requires.
The argument underpinning the investment is also increasingly familiar following Cyclone Gabrielle and other destructive weather events around Aotearoa — spending on resilience before a disaster can be considerably cheaper than rebuilding communities afterwards.
Mana whenua part of the partnership
Te Wai Takamori o Te Awa Kairangi is being delivered through a partnership involving Greater Wellington, Hutt City Council, NZ Transport Agency Waka Kotahi, Ngāti Toa Rangatira and Taranaki Whānui ki Te Upoko o Te Ika.
The programme extends beyond stopbanks and flood engineering.
It is also connected with the Melling Transport Improvements, urban regeneration and environmental enhancement of Te Awa Kairangi, the Hutt River.
That wider approach recognises the awa not simply as infrastructure to be controlled but as a significant environmental and cultural system running through the heart of the valley.
For mana whenua, decisions about the future of the river also carry questions of whakapapa, kaitiakitanga and restoring the health and mauri of the awa alongside protecting communities.
Climate resilience comes with a growing price tag
The revised estimate highlights a challenge increasingly confronting councils across Aotearoa.
Communities need stronger infrastructure to cope with flooding and other natural hazards, but the cost of constructing that resilience is rising at the same time as councils face intense pressure over rates.
Lower Hutt presents an especially difficult equation because the potential exposure includes not just residential properties but a hospital, railway, state highway, businesses and major public infrastructure.
Greater Wellington’s position is that protecting assets of national importance requires a national contribution.
$535m becomes new planning baseline
The $535.4 million estimate will now become the provisional planning figure used while Greater Wellington develops its 2027-37 Long Term Plan.
The cost update will be presented to a Greater Wellington Council meeting on 3 September, with further work continuing to refine the figures and investigate external funding.
Councillors are expected to receive clearer financial options in mid-2027 before Long Term Plan funding decisions are made.
That leaves one enormous question still to be answered.
If protecting Lower Hutt safeguards billions of dollars in homes, businesses, transport links, health services and Crown infrastructure, how much should be paid by local ratepayers — and how much should be considered a national investment in protecting Aotearoa from the next major flood?
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