Panel input guides Wyangala Dam airspace targets

Panel input guides Wyangala Dam airspace targets

15 July 2021

WaterNSW is working with the Bureau of Meteorology and local stakeholder groups to ensure the effective management of the current rain event, including current and future airspace operations in Wyangala Dam.

Wyangala storage is not expected to fill based on the Bureau’s short-term rain forecast.

Releases from the dam – which currently sits at 77% of storage capacity – are minimal due to low irrigation and environmental water demands. The Lachlan Airspace Reference Panel was established in April to provide stakeholder input on storage management objectives.

Two consultation meetings have been held which have provided WaterNSW with local perspective into balancing the dual priorities of maximising water security while providing flood mitigation where possible.

Based on feedback received and medium-term weather forecasts from the Bureau, the following airspace objectives will be prioritised:

End of monthAirspace availableMax dam storage capacity
July7.1%92.9%
August2.6%97.4%
September0%100%

Based on these levels, modelling indicates there is an 80% probability that Wyangala Dam will fill to 100% by October 1.

Customers and other water user groups have advised that irrigation demand is not likely to commence until late September or early October which will mean Wyangala Dam storage will continue to rise.

The delivery of obligatory environmental translucent flows using both dam releases and downstream tributary flows will assist with maintaining airspace in Wyangala Dam and in Lake Brewster in the months ahead.

WaterNSW will continue to work with the Bureau of Meteorology to monitor the rain and inflows and will continue to consult with the Lachlan Airspace Reference Panel to review airspace targets. For further information, visit www.waternsw.com.au

Media Contact – Tony Webber 0428 613 478 or Angela Davies 0467 947 426

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