Gnangara levels show critical process of Perth’s groundwater supplies
Released 10 Sep 2008
The Gnangara mound levels continued to improve for the third month on last year's averages, the Department of Water's monitoring program has revealed, and demonstrate the lag time in rainfall seeping into the vital groundwater source.
August levels for the Gnangara mound, released today, show an across mound improvement of 27cm or 270mms compared to the same time last year.
It is also 11cms or 110mm higher than records for August 2006, and follows improvements on comparative annual levels for both June and July.
"The levels demonstrate the lag time between rain water reaching the underground aquifers," the Department of Water's director of water resource use Rob Hammond said.
"With dam levels lower than average for August and the low August rainfall, this will probably translate into a reduced improvement of levels for September.
Mr Hammond said while this was positive news levels were still quite low and continued good management must be exercised in drawing on the Gnangara water source.
The Gnangara mound supplies 60 per cent of the metropolitan area's drinking water.
The average levels are created from measurements taken from 50 bores across Perth's major source of drinking water.
Contact: Peter Collins
Phone: (08) 6364 6848 / 0434 603 441