The Wanaka Sun

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Larger than life page 2

ANZAC service Celebrating 50 years page 4

Hawea Flat School children perform Pa Mai at the Lake Hawea dawn service yesterday. Guest speaker Lt Cdr Bruce Walker said it was wonderful seeing young people commemorate Anzac Day. PHOTO: wanaka.tv

Dairying not a problem Caroline Harker

Limbering up page 6

Classic attempt page 9

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www.thewanakasun.co.nz

The biggest threats to water quality on the Hawea plain come from septic tanks and border dyke irrigation, not dairy farming, according to Otago Regional Council groundwater scientist Scott Wilson. Scott has been studying the aquifer for some months and addressed a public meeting in Hawea Flat on Sunday night. He told the meeting that even if the entire Hawea area was covered with dairy farms (at a ratio of three cows per hectare), the nitrate concentrations would still be well below the Ministry of Health drinking water standard, if farmers keep to the new allowable nitrate leaching rate under ORC’s proposed plan change 6A (water quality). Protect Our Water spokesperson Mark Thomas said POW would be happy to have dairying in the area if ORC would guarantee it wouldn’t degrade the water. “But there is nowhere in New Zealand where intensive dairy farming hasn’t resulted in polluted water,”

he said. “We are impressed with the ORC’s communication and willingness to discuss water quality issues, but their policy of allowing deregulated dairy farming to go ahead and not policing it until a breach is detected is totally the wrong way to go. Look at Southland. Look at Taranaki. Southland has gone back to a system where every

hectare per year (30kgN/Ha/yr). Scott said at this rate nitrate concentrations from dairy farming would be around 2mg/l nitrate-N or less, which is way below the MOH standard of 11.3mg/l. “Plan change 6A is expected to protect the water supply from farming activities,” Scott told the meeting.

There is nowhere in New Zealand where intensive dairy farming hasn’t resulted in polluted water. dairy conversion has to be publically notified. We want that to be the case here.” Mark said POW will be making a submission on the ORC’s water quality plan change asking for dairying to be publically notified, until the ORC can guarantee intensive dairy farming will not pollute the aquifer. The proposed new allowable nitrate leaching rate is 30kg of nitrogen per

“A leaching rate of 30kgN/Ha/yr is a significant improvement on current leaching rates. One major implication of the plan change is that border dike irrigation would no longer be tenable.” Scott said border dike irrigation on Hawea soils leaches from 60-120kgN/ Ha/yr. To meet the proposed new leaching rate farmers would need to change to another kind of irrigation,

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for example spraying. While most of the water throughout the Hawea plain is pristine, Scott said the exception is Hawea Flat, which has higher total dissolved solids. “The only possible source of the higher nitrate concentrations is contamination from septic tanks, which are situated below the soil profile,” he said. Hawea Community Association president Rachel Brown said it was very good to have a scientist working in the area giving people a proper understanding of the aquifer. “It’s great to have dialogue with the scientist and with the regional council,” she said. “Now we are getting real information.” Scott’sresearchshowsthegroundwater in Hawea Flat is primarily sourced from rainfall (rather than the lake), whereas the groundwater in most of Hawea is mainly lakewater. Story continues page 3...


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