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In response to the 2010-11 dry season, the Department of Water and Environmental Regulation updated the definition of areas deemed suitable/unsuitable for additional garden bores in the Perth region. Areas designated unsuitable for additional garden bores are defined by the following factors:
- salinity levels likely to be 1500 mg/L TDS or greater (in some instances >1000 mg/L TDS) because of proximity to river or ocean;
- proximity to conservation wetlands (EPP 2004, Conservation, and Resource Enhancement);
- proximity to contaminated areas where groundwater may be polluted;
- potential for unreliable supply from clayey soils (Guildford Clay);
- areas of thin superficial formations underlain by Rockingham Sand and/or Leederville Formation;
- potential for development of acid sulphate soils;
- current Gnangara Mound groundwater abstraction risk map plus buffers around wetlands recommended for protection in the Gnangara Sustainability Strategy; and
- areas over-allocated to existing users and where additional garden bores could present a sustainability risk to the groundwater.
The boundary between suitable/unsuitable areas for additional garden bores has been modified to best fit along property boundaries and roads. These adjustments, combined with inherent inaccuracies in the boundary location, mean that results near boundaries may not be accurate.
For more information contact our office on (08) 6364 7600 or see http://atlases.water.wa.gov.au/idelve/gwa/.