Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
November water use to date 24.2 billion litres
21.9 billion litres
Dam storage levels N/A 49.8 per cent
Monthly streamflow into dams N/A 3.43 billion litres
November rainfall to date 22.4mm (Nov average rainfall 1876-2016) 83.6mm
Note: 1 billion litres = approximately 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 896 million litres per day, which was below the forecast of 934 million litres.


Daily water use for the last 5 days

Table showing daily water use for the last 5 days
Date Actual water use (million litres) Forecast water use (million litres)
20/11/2020 887
19/11/2020 937 945
18/11/2020 917 945
17/11/2020 948 945
16/11/2020 947 918
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 101.57 billion litres of water – which is 1.82 billion litres below the forecast target for this period.


Dam levels (total for 15 dams)

The dam storage levels have decreased slightly this week and are sitting at a combined 49.8 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 41.9 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 176.73 billion litres.

Sprinkler roster compliance

Since 1 January 2020, we have taken a total of 5,192 actions (warnings + fines) compared with 8,365 actions for the same period in 2019.

Annual rainfall

Perth has received 665.0mm of rainfall since 1 January 2020. The average (1994-2019) rainfall for the same period to the end of November is 716.3mm.

General water news


Did you know Water Corporation manages more than 2,500km of drains and around 40 per cent of Perth’s urban drainage network? This network plays a vital role in helping protect homes and business from flood damage in large storm events.

Alongside the Department of Water and Environmental Regulation, we're working with communities across Perth to transform stormwater drains and increase green open spaces through our Drainage for Liveability program.

So, what is Drainage For Liveability? Well, for an answer look no further than our recent project with the City of Bayswater at Peters Place Reserve in Morley. One year on from completion, the site is unrecognisable. Where a barren patch of grass, weeds and a long drainage channel once stood, there is now a thriving wetland.

Peters Place Reserve is an award-winning project, and a perfect example of how the Drainage for Liveability program is helping improve stormwater quality and beautify our suburbs.

To read more about Peters Place check out our project case study, or for more on the Drainage for Liveability program, click here.