Torrens Lake at the Weir

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Archived water quality assessments

The indicators that are measured in the Torrens Lake are turbidity and bacteria. The concentrations of these indicators are used to classify the water chemistry as being in good, moderate or poor condition, according to the needs of recreational environmental values.

Water chemistry classification October 2005 to March 2006

Indicator	Classification
Oxidised Nitrogen	Poor
Total Nitrogen	Poor
Soluble Phosphorus	Good
Total Phosphorus	Good
Turbidity	Good
Bacteria	Poor

The results for this sampling period are consistent with previous results. Nitrogen levels can be increased as a result of fertilisers and detergents being washed into urban stormwater drains. The nutrient concentrations do not directly affect the recreational values of the Torrens Lake. However, high nutrient concentrations can lead to undesirable algal blooms which can cause odours, appear unpleasant and even result in closure of the lake.

The bacterial (Enterococci) levels in Torrens Lake are high for recreational uses. The Adelaide and Mount Lofty Ranges Natural Resources Management Board is responsible for managing water quality in the Torrens River catchment, while the Adelaide City Council is responsible for managing the aesthetic quality of the Torrens Lake between Hackney Road Bridge and the Torrens Weir.

Water chemistry classification April to September 2005

Indicator	Classification
Oxidised Nitrogen	Poor
Total Nitrogen	Poor
Soluble Phosphorus	Good
Total Phosphorus	Good
Turbidity	Moderate
Bacteria	Poor

Nitrogen levels can be increased as a result of fertilisers and detergents being washed into urban stormwater drains. The nutrient concentrations do not directly affect the recreational values of the Torrens Lake. However, high nutrient concentrations can lead to undesirable algal blooms which can cause odours, appear unpleasant and even result in closure of the lake.

High turbidity is generally due to suspended solids that are carried into the river in stormwater, although some algae can also have the same effect.

The bacterial (Enterococci) levels in Torrens Lake are high for recreational uses. The Adelaide City Council is responsible for managing the Lake, including public notification of poor conditions for recreational contact.

This page was last modified 13-09-2007