New Zealand has more than 70 river systems. NIWA capability supports the measurement, knowlege and tools need to manage, protect and restore these vital waterways and their ecosystems.

  • Restoration of aquatic ecosystems

    Research Project
    This project aims to increase our knowledge of aquatic ecosystems and their restoration, and apply this to degraded streams, rivers, lakes and estuaries.
  • On the search for invaders

    Media release
    Deep beneath Waitomo’s rolling hills lies a maze of caves and underground rivers. Here, NIWA researchers braved the dark waters to measure the current and hunt for fishy invaders under the twinkle of the cave’s magical glowworms.
  • Dramatic changes in New Zealand river flows, research finds

    Media release
    River flows in New Zealand have changed dramatically over the past 50 to 90 years as the climate has varied, a new study has found.
  • Half of NZ’s rivers blocked for migratory fish

    Media release
    Nearly half of New Zealand’s river network is partially or fully inaccessible to migratory fish, a new study shows.
  • Riparian Buffer Design Guide

    This guide discusses design principles and provides high-level information about the likely performance of riparian buffers.
  • Ki uta ki tai: NIWA’s role in mountains-to-sea estuarine management

    Media release
    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.
  • Removing barriers to ensure freshwater fish can complete their life cycle

    Media release
    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.
  • Public asked to help build national flood photo database

    Media release
    NIWA is asking people in flood-affected areas to contribute photos to a national database to support understanding of flood hazard and flood risk.
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    Report: Trends analysis for selected indicators of Waikato River health and wellbeing 2010-2019

    Report: Trends analysis for selected indicators of Waikato River health and wellbeing 2010-2019
  • The largest flood flow ever measured

    Media release
    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.
  • New weapon in fight against invasive aquatic weeds

    Media release
    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.
  • Trustpower's Waipori power scheme