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Naturalisation of drainage channels in Canberra, ACT

Burnett, Rosemary (2016). Naturalisation of drainage channels in Canberra, ACT. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Burnett, Rosemary
Title Naturalisation of drainage channels in Canberra, ACT
Institution Charles Darwin University
Publication Date 2016
Thesis Type Bachelor of Engineering (4th Year Project)
Supervisor Wolff, R
Prathapan, Sabaratnam
0905 - Civil Engineering
Abstract This thesis investigates the effects of converting concrete lined stormwater channels to natural vegetation, looking specifically into open channel flow parameters including; peak flow rate, channel cross-sectional area, velocity of the discharge, and peak flow depths in a 100, 20, 5 and one-year storm events. This is done by investigating one specific case-study of an existing channel. Several scenarios have been modeled using HEC-RAS software to measure, and visually represent the changes to flow parameters during these storm events.

There are 56 kilometres of these concrete-lined channels in the Australian Capital Territory’s stormwater network, many of which flow through urban recreational parks. These channels are nearing the end of their design life, and large sections are not compliant with the current design standards, and thus the question of what to do next is pertinent.

The ideal design option researched in this thesis is to remove the concrete lining of these channels and establish natural grasses and vegetation to create a wide natural channel. The potential benefits of this would be to decrease peak flow velocities to comply with design standards, reduce depth of flow and provide a more aesthetically pleasing environment. It is also predicted that this conversion to natural lining would improve discharge water quality and flow on effects further downstream within the river system.
Keyword stormwater drainage
open channel flow
concrete channels
vegetated channel
peak flow
rational method
Manning's number
water sensitive urban design (WSUD)
Open access True

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