Rainfall and inflows

Rainfall and inflows

Updated: Thursday 4 July 2019

It’s been raining this week across Sydney but what does that mean for the drought?

Greater Sydney requires around 200mm of rainfall over a few days to fill the system.

A rain event of around 25 to 30mm over 24 hours would result in a notable increase in inflows. In that case, there could be changes in water quality within the lakes, but no spills, apart from Tallowa Dam in the Shoalhaven.

The privately-owned Sydney Desalination Plant is powered by 100% renewable energy and can supply up to 250 million litres of water a day, which is approximately 15% of Sydney's water needs.

Note: Rainfall amounts are measured in millimetres for the 24 hours to 9am.

Inflow amounts are based on stream gauge data, measured in megalitres per day at 9am. The inflow to the Blue Mountains is ungauged.


Tuesday 16 July
1,332,674 ML
2,581,850 ML
8,282 ML
1,184 ML
-7,830 ML
Tuesday 16 July