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General Description
Malabar, North Head
and Bondi outfalls collectively discharge more than eighty percent of
Sydney’s sewage effluent (EPA 1996a). They have been the subject of a
series of intensive studies (EPA 1996a, Krogh et al 1997) and will not be
treated with detail in this report. [Interested readers are referred to
the Final Report Series from the Environmental Monitoring Program (EPA
1996a-g) and references therein, and to the follow up study on soft bottom
benthic communities conducted by Krogh et al 1997].
Sewerage
Catchment:
-
North Head
outfall is the discharge point for the North Head STP which serves
most of the suburbs east of Blacktown between the Parramatta and
Hawkesbury Rivers, as well as the western suburbs south of the
Parramatta River including Parramatta, Fairfield and Prospect. The
Bondi outfall is the discharge point for the Bondi STP which services
the City of Sydney, and the municipalities of Leichhardt, Marrickville,
Randwick, Waverley and Woollahra. The Malabar outfall is the discharge
point for the Malabar STP which receives sewage from most of the
suburbs between Parramatta and the Georges River west to Campbelltown
Sewage
Treatment:
Outfall:
-
A deepwater
ocean outfall that now services North Head STP was commissioned in
December 1990. The deepwater outfall consists of a 3.5 m diameter
tunnel approximately 3500 m long with a diffuser zone 765 m long and
is located in an average water depth of 60 m.
-
A deepwater
ocean outfall that now services Bondi STP was commissioned in August
1991. The deepwater outfall consists of a 2.3 m diameter tunnel
approximately 1700 m long with a diffuser zone 510 m long and is
located in an average water depth of 60 m.
- A deepwater ocean outfall that now services
Malabar STP was commissioned in September 1990. The deepwater outfall
consists of a 3.5 m diameter tunnel approximately 4100 m long with a
diffuser zone 720 m long and is located in an average water depth of
80 m.
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