WaterNSW monitoring rain event as dam spills likely

WaterNSW monitoring rain event as dam spills likely

28 February 2022

WaterNSW is monitoring a significant rain event making its way into the Greater Sydney catchment, which is likely to push some Sydney dams beyond capacity, including Warragamba.

With Sydney’s dam network at 97% of capacity and Warragamba at 98.4%, heavy rain forecast by the Bureau of Meteorology for midweek is likely to generate sufficient inflows to cause spill events at a number of dams.

This includes Warragamba Dam, at a rate below the spill experienced in March 2021 but still likely to result in downstream river level increases. The spill rate will be determined by the intensity of the rainfall and the inflow generated.

Tallowa and Cordeaux Dams are already spilling and other Upper Nepean storages likely to spill in the days ahead include Nepean, Avon, and Cataract, along with Woronora Dam to Sydney’s south.

WaterNSW will be monitoring any impacts on the quality of water in dam storages as a result of the inflows, and working with Sydney Water to manage supply.

In regional NSW Toonumbar Dam, on the North Coast near Kyogle, and Brogo Dam on the South Coast near Bega are both spilling and expected to continue. Inflows are also anticipated into Burrinjuck Dam on the Murrumbidgee River, and Wyangala Dam on the Lachlan River.

WaterNSW will be working closely with the Bureau of Meteorology to monitor weather forecasts for key catchments and inflow projections.

WaterNSW advises landholders and the public to monitor advice from the Bureau of Meteorology regarding changing river heights and the need for precautions with livestock and infrastructure.

To access WaterNSW information on river heights and flow data visit: WaterInsights

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NSW State Emergency Service (SES)

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