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Document library Predicting Droughts in Wellington's Water Supply Catchments Using the Southern Oscillation Index : Scoping Study

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Category
  • Environmental monitoring > Rainfall and river levels
  • Title Predicting Droughts in Wellington's Water Supply Catchments Using the Southern Oscillation Index : Scoping Study
    Date published 1 March 1996
    GWRC Publication No WRC\RINV-T-96/18 part I
    Abstract This report is a scoping study commissioned by the Bulk Water
    Department. It is to assess whether a relationship exists between the
    Southern Oscillation Index (SOI) and river flows in the Wellington
    metropolitan water supply catchments.

    If a relationship exists, the extent to which this can be used to predict low
    river flows with a reasonable led in time will be assessed.
    Based on the scoping study findings, recommendations for future work
    and more comprehensive analyses will be given.

    If forecasts of low rainfall/river flow periods can be issued, proactive
    planning of the metropolitan bulk water supply system can be achieved.
    This will allow the Bulk Water Department to:

    - Decide on appropriate abstraction regimes from the various water
    sources.
    - More effectively manage the Te Marua lakes and Hutt aquifer storage.
    - Implement timely conservation measures.
    - Plan maintenance to ensure all supplies are operational during a
    forecast drought.
    - Include the forecast methodology into Phase I of the Bulk Water Drought
    Strategy.
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