09035: Implementing the Swan–Canning river system Water Quality Improvement Plan
The Swan-Canning river system is under pressure from high nutrient levels.
More than 250 tonnes of nitrogen and 26 tonnes of phosphorus enter the system each year-almost 50 per cent more than it can assimilate. Algae blooms, low oxygen levels, fish kills and loss of biodiversity have resulted, with impacts compounded by below-average rainfall and changes to hydrology.
The Water Quality Improvement Plan (WQIP) for the system identifies farming activities in the Ellen Brook sub-catchment as the main source of phosphorous pollution. The main source of nitrogen pollution is residential and recreational activities in urban sub-catchments.
The Swan River Trust and the Department of Water are working with the community to implement projects targeting sub-catchments that contribute the greatest amount of nutrient to the system.
Structural interventions to be implemented include:
- nutrient-stripping wetlands
- stock exclusion
- restoration of riparian zones
- removal of contaminated sediment
- application of nutrient-binding material (Phoslock).
Light industry in the Welshpool and Kewdale areas will also be audited to identify and reduce the sources of nutrient and contaminants.
|Investment:||$ 3 190 000|
|Delivery organisation:||Swan River Trust and Department of Water|
|Project duration:||November 2009 - December 2011|
|Location:||Swan–Canning river system|