Rain filling Sydney dams, Warragamba spill imminent

Rain filling Sydney dams, Warragamba spill imminent

20 March 2021

Heavy rain is generating large inflows that are filling Sydney’s supply dam network, with Warragamba Dam forecast to fill and commence spilling by mid-afternoon today (Saturday, 20 March).

With the Upper Nepean region already receiving the impact of the severe weather event, dams such as Nepean, Cataract, Cordeaux and Avon are also expected to reach capacity and begin spilling later this afternoon (Saturday, 20 March).

The revised predicted spill timing for Warragamba is several hours earlier than originally forecast and the volume of spillway flow will increase into Sunday as inflows continue.

The Bureau of Meteorology is forecasting a coastal trough, which developed along the North Coast, will continue to generate heavy rain across the Greater Sydney catchment throughout the day.

Public access to WaterNSW dam sites and associated public areas is off limits until further notice as a safety precaution.

WaterNSW has established a dedicated 24-hour incident management team that is working closely with the Bureau and the NSW State Emergency Service to monitor weather and inflows to dams.

WaterNSW will continue to work closely with Sydney Water and NSW Health throughout the rain event, to watch for potential water quality impacts on untreated supply.

For weather forecasts and flood warnings visit http://www.bom.gov.au/

For emergency information visit https://www.ses.nsw.gov.au/ or contact 132 500

For information on WaterNSW dams visit www.waternsw.com.au or contact 1300 662 077

Media contact – Tony Webber - 0428613478


Sunday 03 July
2,614,900 ML
2,618,706 ML
8,668 ML
1,239 ML
89,916 ML
Sunday 03 July