WSUD Strategy

6.5 Costing
The costing is detailed in Table 6.1 for the elements required to intercept, divert and treat
the water from Bungarribee Creek for the protection of this waterway downstream of
Doonside Road. The estimated annual maintenance cost for the constructed wetland is
$30,000.
Table 6-1: Costs of water management measures for the Airstrip Precinct
Item Unit Cost Unit Amount Total
Diversion Structure $50,000 items 1 $50,000
Bund 1500m
• Earthworks
$15
m 3
10,000
$150,000
• Top soil
$35
m 3
5400
$190,000
• Vegetation
$15
m 2
18000
$270,000
Wetland (2 ha)
earthworks, structures and vegetation $50 m2 20,000 $1,000,000
TOTAL $1,660,000
6.6 Conclusion
The Doonside Road Bridge (built in 1999) which crosses Bungarribee Creek has resulted in
modification to the geomorphology of the creek with flows conveyed downstream at a
greater velocity leading to scouring and erosion of the creek. The proposed development
within the Airstrip Promenade aims to enhance the ecological value of the area and to
create a vibrant community space. This presents an opportunity to address threats to the
waterway from its existing urban catchment. To ameliorate the erosion problems with
Bungarribee Creek and enhance the natural environment within the Airstrip Promenade it is
proposed to intercept, divert and treat some of the frequent events from the upstream
catchment, so as to lessen their impact on the waterways, and to return the waterway
hydrology closer to its pre-development state.
Western Sydney Parklands, Bungarribee Precinct, WSUD Strategy June 2007 15