The investigation of the sustainability of a regional approach to Water Sensitive Urban Design using a Triple Bottom Line Assessment

Black, Gerard Wiiliam (2012) The investigation of the sustainability of a regional approach to Water Sensitive Urban Design using a Triple Bottom Line Assessment. [USQ Project]

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Abstract

This research has compared various contributing economic, social and ecological factors involved with WSUD for both a regional and local treatment strategy for a 33.5 hectare site in the Mackay region. A greater understanding of the benefits and costs of these contributing factors involved in WSUD has been gained throughout this project. A Triple Bottom Line assessment (TBL) involving a multidisciplinary skilled Delphi Panel, representing urban development stakeholders, was used to investigate and ascertain; objectives, values and stakeholder preferences of a preferred treatment strategy approach. Further research was
conducted to identify social and financial performance indicators for use in the TBL assessment, where associated Best Management Practice (BMP) costs and social attributes
linked with existing BMP were investigated.

The Delphi Panel comprised of two groups; an Expert group made up of; a senior civilengineer, a principal civil engineer, a senior hydraulic engineer, a senior engineer (water), a senior landscape architect, a landscape architect, a MRC development approvals officer and an environmental scientist. The Stakeholder group comprises of; a UDIA member, the MRC Councillor for Developments and Approvals, the SLCMA Regional Landcare Facilitator and
a local prominent developer.

The core values of each TBL element identified by the Delphi Panel were; financial element – to minimize cost impacts associated with stormwater treatment assets upon a development, borne by Council, the developer, and ultimately the home buyer; social element - overall
community acceptance of the WSUD design; and ecological element - to reduce impact on receiving waterways and integration of treatment elements into adjoining natural areas.

The total acquisition, typical annual maintenance and life cycle unit rates recommended in this research best reflect the size of the BMPs proposed for Precinct A. The total acquisition unit rates adopted for the following treatment elements were; bioretention swales $326/m2, bioretention basins $310/m2, biopods $330/m2, and constructed wetlands (inclusive of two sedimentation basins approximately 2000 m2 total) $150/m2, and street or verge streets $950 each. Typical annual maintenance costs identified were; bioretention swales $40/m2/yr., bioretention basins $12.50/m2/yr., biopods $12.50/m2/yr., constructed wetlands $2.70/m2/yr., sedimentation basins, $11.20/m2/yr., and street or verge trees $25 each. It is envisaged that these BMP unit rates can be used to help fill the knowledge gap for BMP costs in the Mackay region and potentially other regions.

A regional treatment strategy was the preferred treatment approach to sustainable WSUD recommended by urban development stakeholders in the Mackay region, despite the local treatment strategy achieving a higher value score following the TBL assessment.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Supervisors: Brodie, Ian; Corney, Trevor
Date Deposited: 20 Feb 2013 05:56
Last Modified: 20 Feb 2013 05:56
Uncontrolled Keywords: water sensitive urban design; line assessment; delphi panel
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
URI: http://eprints.usq.edu.au/id/eprint/23036

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