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Hydrologic Modelling of Connectivity Expert Panel Recommendations 2025–Scenario 4–Connectivity EWA–Dam Inflow Trigger

Created 11/02/2026

Updated 11/02/2026

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The Panel recommended that the Gwydir, Namoi and NSW Border Rivers regulated water sharing plans should include a ‘connectivity’ environmental water allowance (EWA) to provide pulses as needed for water quality and other environmental outcomes during dry times. Replenishment releases triggered by the dam inflows falling below the 75th percentile on average over 30 days. Up to two large replenishment releases of 20 GL made each year in each valley triggered by low inflows into storage dams. Release triggered on 31 October and 28 February each year if the inflows to the valley storage dams are less than the 75th percentile. Releases are made to achieve at least a week of flows at Bourke with peak flows above 972 ML/d for up to 10 days and at least 30 GL total event volume.

A connectivity environmental water allowance was not considered for the regulated Macquarie River as it empties into the Macquarie Marshes rather than the Barwon-Darling.

Note: See Analysis of the Connectivity Expert Panel Recommendations: Hydrologic modelling assessment.pdf (attached) for more details.

Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.

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Additional Info

Field Value
Title Hydrologic Modelling of Connectivity Expert Panel Recommendations 2025–Scenario 4–Connectivity EWA–Dam Inflow Trigger
Language English
Licence Creative Commons Attribution 3.0 Australia
Landing Page https://data.gov.au/data/dataset/b0ddbd0a-4854-42e9-90bd-8152ed8a9edc
Remote Last Updated 02/02/2026
Contact Point
NSW Department of Climate Change, Energy, the Environment and Water
?datansw@customerservice.nsw.gov.au
Reference Period 01/01/1895 - 30/06/2023
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        141,
        -32
      ],
      [
        141,
        -28
      ],
      [
        154,
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      ],
      [
        154,
        -32
      ],
      [
        141,
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      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal DataNSW

Data Source

This dataset was originally found on DataNSW "Hydrologic Modelling of Connectivity Expert Panel Recommendations 2025–Scenario 4–Connectivity EWA–Dam Inflow Trigger". Please visit the source to access the original metadata of the dataset:
https://data.nsw.gov.au/data/dataset/nsw-hydrologic-modelling-scenarios-scenario-4-connectivity-ewa-dam-inflow-trigger