WaterNSW monitoring dams as rain event builds

WaterNSW monitoring dams as rain event builds

01 March 2022

WaterNSW is monitoring a significant rain event making its way into the Greater Sydney catchment later today, with Sydney’s dam network at 97.6% of storage capacity, and Warragamba Dam at 99%,

Heavy rain forecast by the Bureau of Meteorology is likely to generate sufficient inflows to cause spill events in coming days at a number of dams, including Warragamba.

The forecast from Bureau for the Greater Sydney catchment has increased overnight, though it should be noted that East Coast Low weather events are very difficult to predict with certainty.

The upper range of the predicted spill peak from Warragamba dam has increased overnight, though it remains at a rate still well below the spill experienced in March 2021. The spill rate will ultimately be determined by the intensity of the rainfall and the inflow generated.

Nonetheless downstream river level increases are likely and will also be influenced by the volume of inflows from tributaries downstream of the dam.

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.

Access WaterNSW information on Sydney Dam levels or river heights and flow data visit: WaterInsights




Bureau of Meteorology (BOM)

Weather forecasts and warnings


NSW State Emergency Service (SES)

Flooding and severe weather warnings and advice



Saturday 02 July
2,529,499 ML
2,618,706 ML
8,828 ML
1,262 ML
5,351 ML
Saturday 02 July