National Water Account 2015

Perth: Region overview

The region is home to waterways and wetlands of national significance. Its groundwater resources support important groundwater dependent ecosystems. The last four decades has seen a long-term decline in rainfall leading to decreased storage levels and aquifer recharge, resulting in an increased reliance on climate resilient water sources, particularly desalination.  

Rainfall

Rainfall icon

614 mm

21% less than last year   
77% of long-term average

Storage

Storage icon

31% full

similar to last year
655,300 ML total capacity

Streamflow

Streamflow icon

Swan-Canning River
Murray River
Harvey River

below average

less than last year

calendar icon showing water year from 1 July 2014 to 30 June 2015

WATER SOURCES

Graph showing breakdown of water sources use in the Perth region for 2014-15. 119,138 megalitres of surface water was diverted or approximately 16% of total water sourced; Groundwater extracted was 483,191 megalitres or 66% of total water sourced; Desalinated water was 119,457 megalitres or 17% of total water sourced; and inter-region inflow was 1,922 megalitres or less than 1% of total water sourced.

Desalinated water

Groundwater

Inter-region water

Surface water

723,708 ML

total water used

2% more than last year

WATER ACCOUNTING STATEMENTS

Water accounting statements icon

Assets

209,854 ML

1%

Icon showing in 2014-15 water assets decreased by 1% from 2013-14.

Liabilities

117,530 ML

9%

Icon showing in 2014-15 water liabilities decreased by 9% from 2013-14.

Inflows

2,184,977 ML

29%

Icon showing in 2014-15 water inflows decreased by 29% from 2013-14.

Outflows

2,008,197 ML

20%

Icon showing in 2014-15 water outflows decreased by 20% from 2013-14.

Net change

9,051 ML

 

Icon showing direction (increase) of net change in water assets in 2014-15.

WATER USE

Surface water diversion icon

119,138 ML

surface water diverted

similar to last year

Groundwater extraction icon

483,191 ML

groundwater extracted

similar to last year

Urban supply icon

291,026 ML

supplied to urban system

similar to last year

Irrigation supply icon

32,958 ML

Arrow down

supplied to irrigation scheme

4% less than last year