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Perth metro weekly water update – 17 July 2020





July water use to date

10.1 billion litres

10.3 billion litres

Dam storage levels


45 per cent

Weekly streamflow into dams


1 billion litres

July rainfall to date

145.3 mm

(July average rainfall 1994-2017)

65 mm

Note: 1 billion litres = approx. 400 Olympic swimming pools. Please note the figures in this table are rounded (except for rainfall) to the nearest whole number.















Water use


Average water use over the past week was 576 million litres per day, which was below the forecast of 595 million litres.


Daily water use for the last five days


Actual water use (million litres)

Forecast (million litres)
















Note: water use is calculated up to 8am each day for the previous 24 hour period


Since 1 July 2020, we have used 9.43 billion litres of water – which is 0.11 billion litres under the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have risen slightly this week and are sitting at a combined 45 per cent* of full capacity.


*Please note some dams are filled from different sources - dam levels include the transfer of groundwater and desalinated seawater from treatment plants as well as streamflow (that comes from rainfall).  As we use many different sources of water, dams are no longer an accurate indicator of the health of Perth's overall water supply situation.

Streamflow (total for 15 dams)


From 1 May 2020 the dams have received 5.2 billion litres of streamflow.  The post-1975 average for the May to April period (called the streamflow year) is 183.9 billion litres.


Sprinkler roster compliance


The two-day a week sprinkler roster now applies. Since 1 January 2020, we have taken a total of 3573 actions (warnings + fines) compared with 5094 actions for the same period in 2019.


Annual rainfall


Perth has received 380 mm of rainfall since 1 January 2020. The average (1994-2017) rainfall for the same period is 396.2mm (to the end of July).



General water news


Our latest Waterwise Demonstration Garden has officially opened at the Bassendean Men’s Shed! The garden showcases native waterwise vegetation and was delivered in partnership with the Town of Bassendean and Bassendean Men’s Shed.


Water Minister Dave Kelly was on hand to help unveil the new garden, which is adjacent a Water Corporation drainage basin that’ll soon undergo a transformation of its own. Learn more here.


In case you missed it, last week we unveiled a very special Splash of Colour project on a wastewater pump station in City Beach. Painted by local artist Pippa Scheepers, the design features Norfolk Island and reflects the importance of water, and its connection to the community and environment.


Stay tuned to learn more about other exciting Splash for Colour projects that we’re gearing up to announce very soon.