Australian Water Management Review Vol. 1 2014 | Page 148

Image 4. Air release facility with cabinet

Image 3. Chemical dosing unit

Image 5. The map above shows the areas serviced by the new scheme

• The chemical dosing unit (CDU) at the Berowra
Truckstop adds chemicals to the wastewater to
ensure corrosion and odours are managed within
the pressure sewerage system.
(See image 3)
• Air release facilities (ARFs) along the reticulation
and transfer mains allow air to flow in and out
of the wastewater system, which also helps to
prevent corrosion.
(See image 4)

• a collection tank with grinder pump
• a discharge pipe
• a control / alarm panel
• a boundary kit (also known as a property
connection point).
To transfer wastewater from each property to the
Hornsby Heights Wastewater Treatment Plant
Sydney Water delivered 4.8 km of pressurised pipes,
the majority of which were located in road reserve,
as well as a 3.4 km pipeline to transfer wastewater
to Berowra.

• Construction started in early 2013 and was
completed in December 2013. Property owners
were advised they could connect to the new
system on the 9 December 2013, six months
ahead of the NSW Government commitment to
provide new wastewater services by June 2014.

West Hoxton

Sydney Water installed four pieces of equipment on
each property eligible to connect to the scheme:

• The entire wastewater system uses gravity
mains. Gravity systems rely on gradually sloping

142 | Australian water man age m e nt re v ie w

Sydney Water provided a new wastewater service to
91 properties in West Hoxton and residents are now
connecting their homes to the