Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search


Managed Aquifer Recharge gets close scrutiny

Managed Aquifer Recharge gets close scrutiny

Two papers on aquifer recharge projects in the Poverty Bay Flats featured at the NZ Hydrological Society conference in Hamilton this week.

George Hampton, a masters student from Waikato University presented his findings on infiltration from the surface into the aquifers and Clare Houlbrooke, a consultant with Golders International, presented an update on the trial injection proposal for a Managed Aquifer Recharge (MAR).

Council’s shared services science manager, Lois Easton says the research on the aquifers in the Poverty Bay Flats and the potential tools to recharge them has undergone some close scrutiny.

Golders have presented scientific papers over the last two years to allow full scientific analysis of the methods and monitoring that is proposed for the trial.

Papers presented have been well received by the Hydrological Science and Regional Council groundwater science communities.

Ms Houlbrooke won a silver medal for a similar paper she presented to the Water New Zealand Conference in October.

“The injection trial proposal is seen as a first of its kind in New Zealand, but also that Golder’s management of the trial’s risks is being accepted by the science industry as the international standard of best practice,” says Ms Easton.

In his presentation on infiltration recharge, George Hampton says two sites were identified for a potential Managed Aquifer Recharge using infiltration basins. These two sites showed promise from desktop investigations but the infiltration rates in practice were low.

Tests at each site indicated low rates of saturated hydraulic conductivity due to the presence of sediments with low permeability – 6.12 cm/day at one site, less than one cm/day at the other site.

Mr Hampton used data from more than 30 bores in the Makauri Aquifer and used infiltrometer methods to measure the ability of water to infiltrate formations of gravel and sand.

His findings confirmed that in the main demand area of the aquifer the static water levels are declining.

There were some wells showing an increase in static water level. These were in the recharge zone where little water is extracted from the aquifer.

The infiltration trials completed last summer, showed that the potential for recharge by infiltration is limited and more work may be required looking at accessing subsurface layers to find reasonable infiltration.


© Scoop Media

Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell: On The Politics Of Why We’re Not Getting An Inquiry Into The White Island Disaster

The Ardern government has made an art form out of reviews and inquiries- when to hold them, when to fold them, and when to shelve the findings, virtually untouched. Among other things, the WorkSafe criminal proceedings into the Whakaari /White Island disaster look like the outcome of a conscious political strategy. The government is choosing this route instead holding a proper inquiry, because it can conveniently narrow the focus only to (a) the events prior to the eruption and (b) solely to possible violations of our labour laws... More>>


UN SDG: A Greener, Cleaner, Brighter Future

'The world has a high fever and is burning up. Climate disruption is daily news – from devastating wildfires to record floods. The damage to people and the environment is immense and growing.' - UN Secretary-General António Guterres ... More>>


Carbon Neutral Policy: Gov Declares Climate Emergency

The Government has launched a major new initiative to combat climate change that will require the public sector to achieve carbon neutrality by 2025. More>>


Pill Testing: Govt Moves On Drug Checking To Keep Young New Zealanders Safer This Summer

The Government will pass time limited legislation to give legal certainty to drug checking services, so they can carry out their work to keep New Zealanders safer this summer at festivals without fear of prosecution, Health Minister Andrew Little ... More>>


Tax: Government Fulfils Election Undertaking On New Top Tax Rate

The Government will today keep its election promise to put in place a new top tax rate of 39 per cent on income earned over $180,000. More>>


Media: Stuff Holds Itself Accountable For Wrongs To Māori

Stuff has today published the results of an investigation into itself, and issued a public apology, for the way the media organisation has portrayed Māori, the indigenous people of Aotearoa New Zealand, from its first editions to now. Tā Mātou Pono | More>>


Economy: Crown Accounts Reflect Govt’s Careful Economic Management

The better-than-expected Crown accounts released today show the Government’s careful management of the COVID-19 health crisis was the right approach to support the economy. As expected, the Crown accounts for the year to June 2020 show the operating balance ... More>>





InfoPages News Channels