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Environmental engineering considerations and sustainable design : the stormwater drain at Charles Darwin University

Burgess, Timothy (2017). Environmental engineering considerations and sustainable design : the stormwater drain at Charles Darwin University. Bachelor of Engineering Co-op (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Burgess, Timothy
Title Environmental engineering considerations and sustainable design : the stormwater drain at Charles Darwin University
Institution Charles Darwin University
Publication Date 2017-06
Thesis Type Bachelor of Engineering Co-op (4th Year Project)
Supervisor Fairfield, Charlie A.
Miloshis, Mike
0905 - Civil Engineering
Abstract Sustainable design of public stormwater infrastructure requires consideration of economic, environmental, social, and in particular, public safety factors. Complications can arise when attempts to address each of these factors result in conflicting design features. This exemplifies the difficulties often faced by engineers in attempting to produce a truly sustainable design, let alone one that is compliant with all statutory guidelines. The trapezoidal, concrete-lined drain at Charles Darwin University (CDU), typifies these challenges.

Various desktop, on-site studies and simulations were undertaken to model the catchment hydrology, and hydraulic characteristics of the existing stormwater drain at CDU. Results indicate that the existing drainage structure has adequate capacity to convey the 63.2% and 1% AEP storm event without overtopping. However, moderate overbank flooding is expected when these storm events occur in conjunction with peak tidal influence from Rapid Creek. For all combinations of storm and tidal events, the stormwater flows are contained within the drainage reserve at CDU.

Alternative, sustainable drainage designs, and their associated physical economic, social and ecological considerations, were also investigated. The United States Army Corps of Engineers HEC-RAS model was used to assess these alternatives, and provided an indication of their likely hydraulic performance. The viability of these alternatives was also assessed against a number of factors including; public health and safety, amenity, functional use, ecological impacts, flooding immunity, future community requirements and overall cost of implementation. Results of the analysis indicate that works directed towards reducing stormwater runoff, nutrients, and gross pollutants from the upstream catchment, would provide the most cost-effective and overall, sustainable design solution on-site.
Keyword drainage

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