Freshwater

We provide public information on river, lake, and groundwater conditions across New Zealand including freshwater quantity and quality.

  • Wetlands

    Wetland species and wetland management in New Zealand.
  • Ten years of willow control at Whangamarino Wetland 1999 - 2008

    NIWA review of the ten year Whangamarino willow control programme and evaluation of willow distribution and other wetland vegetation types.
  • Modelling vegetation-impacted morphodynamics in braided rivers

    NIWA is developing numerical models for predicting how the morphology of braided rivers responds to flow regulation and invasive exotic woody vegetation.
  • Modelling vegetation-impacted morphodynamics in braided rivers

    Research Project
    NIWA is developing numerical models for predicting how the morphology of braided rivers responds to flow regulation and invasive exotic woody vegetation.
  • Managing mangrove expansion

    This manual aims to provide the guidance needed to manage mangrove expansion, while maintaining the ecological integrity of estuaries and harbours.
  • Managing water allocation on the West Coast

    Research Project
    This project investigated the capabilities and utility of NIWA’s Cumulative Hydrological Effects Simulator (CHES) tool for facilitating discussions and decision making associated with setting and applying water quantity limits in the Grey River catchment on the South Island’s West Coast.
  • Environmental flow tools

    Tools and software to assist with determining and managing environmental water flows.
  • Ngā repo o Maniapoto - Maniapoto wetland inventory

    Research Project
    Through the Te Wai Māori fund Ngā Repo o Maniapoto is a collaborative project between NIWA and the Maniapoto Māori Trust Board (MMTB) Whanake Taiao team that looks to develop an inventory of repo and puna (springs) for the Maniapoto rohe.
  • Ngā Kete o te Wānanga: Mātauranga, Science and Freshwater Management

    Research Project
    New Zealand’s freshwater and estuarine resources provide significant cultural, economic, social, and environmental benefits. Competition for the use of these resources is intensifying, and many rivers, lakes and estuaries are now degraded.
  • Geomorphology influences periphyton abundance

    Research Project
    This research project investigated whether the mechanisms for periphyton removal in rivers relate more directly to hydraulic and geomorphic conditions than flow metrics.
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    Monitoring and maintenance of kōura

    Once you have identified the problem, and applied the necessary tools for restoring kōura to your stream, the next phase of your project is to monitor the site to see whether restoration works.
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    Applying the right tools to restore kōura to lakes and streams

    The tools available for restoring kōura to lakes and streams depend on what is causing kōura to decline.