Warragamba to spill again as rain event hits Sydney

Warragamba to spill again as rain event hits Sydney

06 April 2022

Warragamba Dam is expected to spill on Friday as a result of inflows generated by a significant rain event forecast for the Greater Sydney catchment between Wednesday and Friday this week.

Warragamba’s storage remains slightly above full supply level (100%) after the most recent spill event commenced in late March and is likely to be spilling at an increasing rate from midday on Friday.

The Bureau of Meteorology is forecasting that the Greater Sydney catchment could receive 100-200mm of rain over 24-36 hours, with the most intense rainfall scheduled for Thursday (7 April).

Warragamba Dam, along with all the Upper Nepean dams and Woronora are at, or in excess of, 100% of capacity (full supply level) following the most recent rain event.

Based on the mostly likely forecast Warragamba Dam’s spill rate will peak late Friday, at an estimated 250 gigalitres per day, based on 100mm of rain falling in the catchment over two days.

The focal point of the rain event is forecast for an area stretching from the South Coast to the Hunter coast, including the Blue Mountains, according to the Bureau.

Wyangala Dam on the Lachlan River could experience a minor spill next week, while inflow into other major regional dams is expected to be minor to minimal based on the current forecast.

WaterNSW will work closely with the Bureau to monitor weather forecasts and inflows.

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

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