Wyangala Dam releases increase as full capacity expected

Wyangala Dam releases increase as full capacity expected

25 August 2021

WaterNSW has resumed higher releases from Wyangala Dam as inflows continue to increase and the storage is expected to fill later today.

The dam, which started the week at 94% of storage capacity, increased releases to a rate of 22 gigalitres per day (GL/day) at 1pm after cutting back to 3GL/day in the lead up to this week’s rain event.

Inflows to the dam are expected to peak within hours at approximately 80-90GL/day due to a rain event that was at the upper end of the Bureau of Meteorology forecast, meaning the storage will likely reach 100% (full supply level) late this evening (Wednesday) as a result.

Airspace releases in recent weeks, based on rain forecasts from the Bureau of Meteorology, had created capacity to capture and hold 70GL of inflow, allowing time for large tributary flows downstream of the dam to peak and move downriver before higher dam releases resumed.

WaterNSW projections indicate that in the next 7-10 days inflows in excess of 200GL will make their way into the dam, and ongoing release targets were discussed with the local airspace advisory panel this morning, executive manager of system operations Adrian Langdon said.

“Even with inflows peaking at up to 90GL/day, having 70GL of airspace capacity has allowed us to keep releases at just over 20GL/day, greatly reducing potential downstream flow peaks,” he said.

With the Bureau of Meteorology continuing to forecast a climate outlook that “indicates rainfall over the coming three months likely to be above average”, WaterNSW will continue to make airspace releases as required to manage storage levels.

WaterNSW will continue to work in conjunction with and consult local advisory panels, comprised of landholders, local councils, the NSW State Emergency Service and other key stakeholders.

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Media contact – Tony Webber 0428 613 478

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94.0
Tuesday 19 October
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Tuesday 19 October