On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

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    Tuna - solutions: upstream passage for elvers at large barriers

    The need to provide upstream passage facilities for ensuring the long term sustainability of migratory freshwater fish populations is now well recognised.
  • Instream barriers and altered water flow

    Instream barriers and diversions alter the natural flow of rivers, streams, and lakes.
  • Dry stock farming activities

    Dry stock farms can cover large areas of hill-country grassland that may be steep and prone to erosion.
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    Stormwater - an introduction

    Stormwater poses risks to NZ’s urban streams & coastal waters, affecting ecological health & the cultural, social, & economic value of these environments.
  • Climate Change Vulnerability Assessment (CCVA)

    Service
    To prepare for changes in climate, our freshwater and oceans decision-makers need information on species vulnerability to climate change.
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    Graphing with Microsoft Excel

    How do I create a graph?
    Using Microsoft® Excel is easy because the Chart Wizard does all the work for you!
    Simply enter the data for your data table.
    Highlight the cells you want to graph.
    Click on the Chart Wizard icon on the Tool Bar.
    Select the chart type you want to use and click Next.
    Click Next to confirm the range of cells.
    Give your graph a title, label x- and y-axis and click Next.
    Click on the gridlines tab to remove or add gridlines.
    Click Finish and graph is complete!
    Help, my graph is too small!
    When the chart wizard creates your graph it will probably be too smal
  • UV Index at Leigh - 17 October 2023

    Today's UV Index

    Today's UV Index
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    Kōaro

    Kōaro are excellent climbers and like clear, swiftly flowing, forested streams.
  • Working with schools

    We sponsor regional science and technology fairs around New Zealand and support learning programmes that bring science into the classroom.
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    Mean monthly wet-days

    These datasets are available in a range of formats.
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    Map I South

    Education Resource
    The climate of this zone is largely dependent on the lie of the Southern Alps to the west, but many areas are also sheltered by high country to the south and east.