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Perth metro weekly water update – 14 August 2020





August water use to date

8.2 billion litres

8.3 billion litres

Dam storage levels


46.8 per cent

Monthly streamflow into dams


2.14 billion litres

August rainfall to date

124.3 mm

(August average rainfall 1994-2017)

55.8 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 584 million litres per day, which was below the forecast of 588 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 to date, we have used 25.65 billion litres of water – which is 0.4 billion litres under the forecast target for this period.


Dam level (total for 15 dams)

The dam storage levels have risen slightly this week and are sitting at a combined 46.8 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 11.2 billion litres of streamflow.  The post-1975 average for the May to April period (called the streamflow year) is 178.21 billion litres.


Sprinkler roster compliance


The winter sprinkler switch off now applies. Since 1 January 2020, we have taken a total of 4041 actions (warnings + fines) compared with 5748 actions for the same period in 2019.


Annual rainfall


Perth has received 453.4mm of rainfall since 1 January 2020. The average (1994-2019) rainfall for the same period is 510.6 mm.


General water news


Since 2016, Water Corporation’s Pipes for Perth program has replaced more than 160 kilometres of water mains across Perth. We have now commenced stage two of the work to replace century-old water mains in the heart of Fremantle to ensure safe and reliable water supply in the area. 

During these essential works to replace ageing water mains in Fremantle the first wooden blocks used to pave Perth roads over a century ago have been uncovered.

The jarrah blocks were found in excellent condition beneath the bitumen near the Mouat and High Street. According to historical records, the first wooden road block was laid on High Street by the then Mayor of Fremantle Mr E. Solomon on 18 February 1898. By November 1903, Cliff and Mouat streets were also surfaced with these blocks.

Several loose blocks displaced from the original road surface are on display in the Pipes for Fremantle pop-up information centre at 66 High Street; open Tuesdays and Thursdays from 10am to 4pm by appointment. To book an appointment, email

For more information on the Pipes for Fremantle project, visit