Motions Creek stormwater upgrade
Project
background
The Motions Creek catchment
is 456 hectares of commercial and residential development serviced by a complex
network of separate stormwater and combined wastewater and stormwater drainage
systems.
These systems have a number
of deficiencies that require significant investment over many years to resolve.
Under wet weather conditions drainage capacity is frequently exceeded resulting
in isolated habitable floor flooding with hotspots centred around Ivanhoe Road,
along the north-western motorway corridor and the commercial area of Nikau
Street, Shaddock Street and Boston Road.
The map below illustrates the
predicted flooding the will occur in the catchment during large storm events of
1 in 10 and 1 in 100 years. The objective of the new pipe system is to mitigate
this flooding.
Click
on the map to view an enlarged version in Portable Document Files (PDFs) for
which you will need Adobe Acrobat Reader. Click here for more information.
Map file size 994kb 
The combined
system contains a significant number of system relief overflows that frequently
discharge a combination of stormwater and wastewater to Motions Creek during
rainfall.
Project
implementation
The resolution of these
issues hinge upon the installation of new stormwater pipes to augment current
system capacity. The increased capacity will reduce habitable floor flooding and
facilitate Metrowater reducing wastewater overflow discharges to Motions Creek.
The development of the
Motions Creek Catchment Management Plan began in 1991 and the completed plan and
associated supporting material were submitted for ARC approval in 1996. A
comprehensive consent was granted in May 2000.
The new
Motions Creek main stormwater pipeline, currently under construction, will
augment existing stormwater drainage capacity to protect habitable floors from
flooding up to the 100 year rainfall event.
The entire pipeline,
extending from Western Springs Park to Normanby Road in the upper catchment,
will cost approximately $20M and take around 5 years to construct. The new
pipeline began to alleviate habitable floor flooding upon completion of
stage 2 in 2001/02, however full utilisation of the pipe will require
rationalisation of stormwater entering existing drainage systems. Removal of
stormwater from the existing combined system or wastewater separation will
reduce wastewater inputs to the creek.
The project has progressed between the outfall and the top of the catchment and is comprised of 13 stages of works. The final stage connecting Shaddock Street to
Water Street is expected to be completed around 2009.
Click
on the map to view an enlarged version in Portable Document Files (PDFs) for
which you will need Adobe Acrobat Reader. Click here for more information.
Map file size 800kb
