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The study area, the Manawatu region of New Zealand, covers approximately 4200km2 and contains numerous aquifers in unconsolidated Quaternary sedimentary formations. Most of the 5000 bores are shallow, with over 75% being less than 50m. Of concern, is that 20% of bores in the south tap groundwater with a nitrate-nitrogen concentration above the drinking water standard (11.3mg/l). An effective regional...
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