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Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
 December water use to date

2.9 billion litres

2.9 billion litres
Dam storage levels N/A 62.2%
Monthly streamflow into dams N/A 0 billion litres
December rainfall to date 13.10mm (December average rainfall 1876-2016) 0 mm
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 966 million litres per day – slightly above the demand forecast of 965 million litres per day.

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)
03/12/2021 980 974
02/12/2021 962 974
01/12/2021 941 974
30/11/2021 924 974
29/11/2021 1081 951
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2021 to date, we have used 108.61 billion litres of water – which is 1.79 billion litres below the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels are slightly down on last week and are sitting at a combined 62.2 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 2021, the dams have received 138.3 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 178.2 billion litres.

Sprinkler roster compliance

Since 1 January 2021, we have taken a total of 5,062 actions (warnings + fines) compared with 5,300 actions for the same period in 2020.

Annual rainfall

Perth has received 888.4mm of rainfall since 1 January 2021. The average (1876-2016) rainfall for the same period to the end of December is 844.5mm.

General water news

Work has now wrapped up on Water Corporation’s latest drainage upgrade project!

If you live in the Innaloo and Woodlands area you may have seen crews busily working to install new culverts under Scarborough Beach Road and Pearson Street, and widen a drainage channel along Stephenson Avenue.

It’s all part of a $16.7 million project to better protect local homes and businesses from flooding after extreme rainfall events.

The project, which involved the local community in selecting native vegetation lining the drain, now means infrastructure in the area can handle heavier stormwater flows.

We took special care to relocate any fauna in the drain during works, and have since reintroduced these aquatic species to their new home.

You can read more about the project here.