❓ This parliamentary question seeks data on water sources feeding into the Swan and Canning Rivers, including household bore usage, subsurface aquifer discharge, and above-ground flows. The answer provides estimates for each category, highlighting significant variability in surface runoff.
AnsweredQoN 2595Legislative Assembly
QuestionView source ↗
(a) currently extracted by household bores;
(b) flowing into the Swan and Canning rivers through metropolitan subsurface aquifers; and
(c) entering the Swan and Canning rivers through above-ground sources?
(b) flowing into the Swan and Canning rivers through metropolitan subsurface aquifers; and
(c) entering the Swan and Canning rivers through above-ground sources?
AnswerView source ↗
Answered
18 September 2007
Responded by
Minister for Water Resources
Response time
35 days
(a) For the estimated 165,000 garden bores in the Perth Metropolitan area, using on average 800kL per year, the volume of groundwater extracted is estimated to be 132GL per year.
(b) The amount of water discharged from the Gnangara and Jandakot sub-surface aquifers directly to the Swan River - Ellen Brook system is approximately 20.5 GL per year and to the Canning River system is approximately 5.0 GL per year.
(c) The flow from above ground sources, including drains, streams and surface runoff is highly variable from year to year. The annual average flow over the period 2001 to 2006 entering the Swan and Canning Rivers through above ground sources is 301 GL. In comparison for the period 1990 to 2000 the average flow was 646 GL.
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(b) The amount of water discharged from the Gnangara and Jandakot sub-surface aquifers directly to the Swan River - Ellen Brook system is approximately 20.5 GL per year and to the Canning River system is approximately 5.0 GL per year.
(c) The flow from above ground sources, including drains, streams and surface runoff is highly variable from year to year. The annual average flow over the period 2001 to 2006 entering the Swan and Canning Rivers through above ground sources is 301 GL. In comparison for the period 1990 to 2000 the average flow was 646 GL.
Notice: This document is created or edited using unregistered or evaluation copy of rtLib valid for testing or development purposes only. To use it for productive or any other purposes please register it. You may purchase the license on
http://www.rtlib.com
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