Christchurch's Avon-Heathcote estuary research a world-first - Scoop.co.nz (press release)

Christchurch's Avon-Heathcote estuary research a world-first Scoop.co.nz (press release) The Avon-Heathcote estuary nutrient levels were high due to the input of treated sewage over the past 50 years or so. Sewage has high amounts of nitrogen, particularly ammonium, and phosphorus. These high nutrient levels degraded the estuary.

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