|Major exceedances||Significant exceedances||Number of monitoring sites assessed|
adapted from Source: National Land and Water Resources Audit 2001, Australian Water Resources Assessment 2000. Surface water and groundwater - availability and quality, Land and Water, Canberra, viewed 5 Dec 2005, http://audit.ea.gov.au/ANRA/water/docs/national/Water_Quality.html, Tables 6-11
The areas with major pH exceedances included tropical Queensland coastal basins within the North-East Coast Drainage Division and the Campaspe basin within the southern Murray-Darling Drainage Division. Several other basins within the southern Murray-Darling Drainage Division and one each within the South-East Coast, South-West Coast and North-East Coast Drainage Divisions also show significant exceedances.
Many of the pH exceedances are in coastal basins and may indicate natural floodplain conditions or the disturbance of in situ acid-sulfate soils.
In one basin of the Victorian section of the Murray-Darling Drainage Division there are increasing pH trends (increasing alkalinity) and decreasing pH trends (increasing acidity) in six basins. In the South-East Coast Drainage Division, decreasing pH trends were identified in four basins and extensive increasing trends in three basins. Two Queensland basins in the North-East Coast Drainage Division also exhibited pH trends - the Brisbane, more acid and the Fitzroy, more alkaline.
Source: National Land and Water Resources Audit 2001, Australian Water Resources Assessment 2000. Surface water and groundwater - availability and quality, Land and Water, Canberra, viewed 5 Dec 2005, http://audit.ea.gov.au/ANRA/water/docs/national/Water_Quality.html.
pH is a major water quality issue in 7 (16%) of assessed basins.
NLWRA data have not been updated since its report was published in 2001.
Number of exceedences of water quality triggers for pH is a direct measure of the pressure of acid soils and other pollution on inland waters.
Other indicators for this issue:
- IW-14 Volume of sewage discharge to surface waters by treatment category (primary, secondary, tertiary)
- IW-15 Volume of sewage discharged to land
- IW-16 Total pesticide use
- IW-22 Exceedance of biological and chemical water quality triggers
- CO-28 Quantity of discharges of different substances from humans activities to coastal and marine waters
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Links to data in the DRS
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