Freshwater

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

  • 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.
  • Murchison Mountains electronic weather station (EWS)

    The Murchison mountains SIN station is located at 1140 m elevation in Fiordland National Park. Because of the low elevation, snow often comes and goes throughout the winter season. Snow records start in 2012.
  • Castle Mount electronic weather station (EWS)

    Castle Mount electronic weather station is at 2000 m elevation on an exposed site above the Milford Track. Records here begin in 2012. Strong winds limit snow accumulation during the winter.
  • Mount Larkins electronic weather station (EWS)

    The Mount Larkins electronic weather station is located east of the main divide near Glenorchy and Lake Wakatipu at 1900m elevation.
  • Mueller Hut electronic weather station (EWS)

    Mueller Hut electronic weather station is at 1818m elevation and located in Mount Cook/Aoraki National Park. This site also measures solic precipitation and solar radiation. This is the deepest (~3m) of all the snow and ice network sites and records at this site start from 2010.
  • Mount Philistine electronic weather station (EWS)

    The Mount Philistine site is located at 1655m elevation on the Main Divide near Arthurs Pass and Rolleston Glacier. It is a high precipitation area and snow records here start in 2010.
  • Mahanga electronic weather station (EWS)

    Mahanga electronic weather station (EWS) is on Mount Mahanga in Tasman. It is at 1940 m elevation near the Nelson Lakes. It's our most northerly South Island site and our snow records here date back to 2009.
  • 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

  • NIWA calculates 1:200 year flood for parts of Canterbury

    Media release
    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.
  • Field teams and forecasters cover monumental rainfall event

    Feature story
    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.
  • eFlows Explorer

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