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SV010
Water Sensitive Urban Design Systems Maintenance Cost Analysis

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Overview
Water Sensitive Urban Design (WSUD) infrastructure is essential for meeting State Government legislated water quality targets.
This poster reviews projected maintenance costs for WSUD assets in the City of Whittlesea in Melbourne’s outer North.

 

Method
Melbourne Water’s WSUD Life Cycle Costing Data was used to assess all WSUD assets in the City of Whittlesea to calculate annual maintenance budgets.

 

Results
Total annual maintenance costs were estimated to be $1.9 million for the 44.4 hectares of WSUD assets in the municipality (2012 data). 

Wetlands, sedimentation basins and GPTs had the lowest treatment costs per hectare of catchment, whereas raingardens and swales had the highest.

 

Conclusion / Discussion
The long term maintenance cost implications of WSUD assets are an important consideration for growth Councils, especially in the context of rate capping, urban sprawl and climate change adaptation.

Future urban developments will emphasise the construction of WSUD assets servicing larger catchments (>5 Ha) to reduce stormwater treatment costs.

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