❓ Question regarding the total phosphorus and nitrogen load entering the Swan and Canning river systems, and specifically the contribution from Water Corporation sewage facilities. The answer provides estimates for both total load and Water Corporation contributions.
AnsweredQoN 2923Legislative Assembly
QuestionView source ↗
(1) What is the total load of phosphorous and nitrogen estimated to enter the Swan and Canning river systems per year from all sources?
(2) How much phosphorous and nitrogen is estimated to have been added to the Swan and Canning river system in each of the last five years as a result of spills or other discharges from pipes, pump stations or other sewage facilities operated by the Water Corporation?
(2) How much phosphorous and nitrogen is estimated to have been added to the Swan and Canning river system in each of the last five years as a result of spills or other discharges from pipes, pump stations or other sewage facilities operated by the Water Corporation?
AnswerView source ↗
Answered
17 August 2004
Responded by
Minister for the Environment
Response time
63 days
(1) The average annual load to the Swan and Canning Estuary is estimated to be 970 tons of nitrogen and 65 tons of phosphorus.
(2) The Water Corporation estimates that 289kg of nitrogen and 72kg of phosphorus have entered the Swan-Canning river system over the last 12 years to January 2004. This is based on the assumption that 4,829kL of sewer overflows have occurred in that time with 100 kilolitres of wastewater containing approximately 6kg of nitrogen and 1.5kg of phosphorus.
(2) The Water Corporation estimates that 289kg of nitrogen and 72kg of phosphorus have entered the Swan-Canning river system over the last 12 years to January 2004. This is based on the assumption that 4,829kL of sewer overflows have occurred in that time with 100 kilolitres of wastewater containing approximately 6kg of nitrogen and 1.5kg of phosphorus.
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