Perth metro weekly water update – 10 January 2020






January water use to date

10 billion litres

10 billion litres

Dam storage levels


47 per cent

Weekly streamflow into dams


44 billion litres

January rainfall to date

16.7 mm

(January average rainfall 1994-2017)

1.80 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 1004 million litres per day, which was below the forecast of 1042 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 2019, we have used 151.1 billion litres of water – which is around 6 billion litres over the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have dropped slightly this week and are sitting at a combined 47.1 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 2019 the dams have received 44.1 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 258 actions (warnings + fines) compared with 193 actions for the same period in 2019.


Annual rainfall


Perth has received 1.80 mm of rainfall since 1 January 2019. The average (1994-2017) rainfall for the January period is 16.7 mm.


General water news


The Bureau of Meteorology has forecast maximum temperatures of above 30 degrees for the next six days, with a top of 37 degrees on Tuesday.


Water use peaks during hot weather, with up to 1 billion litres of water used across Perth on a hot summer’s day.


If you do have to drench your garden to keep it alive during warmer weather, it could be time to consider something more practical and waterwise. Visit the Garden Design page of our website to find waterwise ideas for your garden, suited to the area where you live in Western Australia.


BoM Perth forecast

Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555