$9 Million to Drain a Sinking Farmed Wetland Below Sea Level ?

A Waikato Regional Council (WRC) project near Ngatea on the Hauraki Plains to use pumps and a canal to drain 1100 hectares of farmland on sinking peatland/wetland has seen the cost rise steeply from $2 million in 2013 to $9 million today.  The cost benefit analysis carried out was deficient, and the latest research on potential climate change impacts has not been adequately considered.  A rigorous review of the project is required.


WRC’s PGF and Covid 19 application to central government to cover a $3 Million shortfall in funding says –

“Without action, the area is estimated to be totally submersed within the next 50 years and uneconomic for some time prior to this due to ongoing peat settlement. Deterioration in profitability is estimated at 75 percent over a 30-year period.”

I believe an updated more rigorous review of the project is required before a decision is made whether to proceed, but the majority of fellow Councillors wish to push on.  Here’s why I believe a review is necessary – 

A.   Deficient Cost Benefit Analysis (CBA) Has Been Relied Upon

  1. The CBA says capital spending up to $7.65 million would be economically viable but the estimated cost is already $9 million.  This means WRC’s own required rate of return of 2.25% will not be met.
  2. the CBA does not adequately value the option of allowing the land to revert to a wetland or consider alternative land uses.
  3. There is insufficient accounting for the costs of greenhouse gases from the project
  4. the CBA does not adequately assess/cost the impacts of more intensive cattle farming on biodiversity in the peat lands, the areas surrounding the project, or in downstream waterways and the Firth of Thames.

B.     Latest climate change/sea level rise projections have not been considered

The nearby Piako River has a tidal influence and therefore the project site is affected by sea level rise. The projection of sea level rise of 1 m within 80 years adopted by WRC for the project is outdated and does not reflect the latest climate science which has an upper bound of 2m by 2100.  As a result, the risks of climate change, sea level rise and increased intensity and frequency of natural hazards impacting the project has not been adequately assessed.

C.    No Public Notification

Whilst non-notification of the resource consent may have been legal, the project did not come under sufficient public scrutiny because some interest groups and individuals were not given the opportunity to have their say.

A Newsroom article describes environmentalists concerns about the project.

View these slides from a presentation given to WRC Councillors recently for more information on the project –

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One thought on “$9 Million to Drain a Sinking Farmed Wetland Below Sea Level ?

  1. This sounds like madness to me. Inevitably much of the Hauraki Plains peat country will be unsuitable for farming. What happens to all that cow poo which is being pumped into the Piako River? I certainly object to my rates being used for this scheme.


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