Rivers

Estuaries are coastal waterbodies where freshwater mixes with seawater. Many estuaries in Aotearoa New Zealand have been impacted by pollutants and contaminants entering via freshwater.

New Zealand has just over 50 native freshwater fish species. Of these, 85 % are endemic and 75 % are deemed to be at risk of decline or are threatened.

NIWA is asking people in flood-affected areas to contribute photos to a national database to support understanding of flood hazard and flood risk.

Protection of the Awa Models enable us to predict how different uses of the land and water will impact river and stream health.

Report: Trends analysis for selected indicators of Waikato River health and wellbeing 2010-2019

Flood flows on the Buller River this month were the largest of any river in Aotearoa New Zealand in almost 100 years, NIWA measurements show.

A combination of artificial intelligence and scientific ingenuity looks set to be the next step forward in protecting Aotearoa New Zealand’s lakes and rivers from invasive aquatic weeds.

or over 100 years Trustpower's Waipori power scheme has supplied Dunedin with hydroelectric power.

Preliminary analysis by NIWA climate scientists has shown that the recent Canterbury rainfall was so extreme in some inland places that it could be expected to happen only once every 200 years.

The prodigious rainmaker that hit Canterbury earlier this month saw NIWA field teams out in the elements collecting flood data from bridges, cableways and jetboat gaugings.

The eFlows Explorer webtool is designed to aid broad-scale river flow management planning across New Zealand

A NIWA scientist is asking for the help of skiers, mountaineers and alpine professionals to collect snow for a new research project.