Emulating pre-urban initial rainfall losses and restoring baseflow with rainwater harvesting

Taylor, B. A. (2012) Emulating pre-urban initial rainfall losses and restoring baseflow with rainwater harvesting. In: 7th International Conference on Water Sensitive Urban Design (WSUD 2012): Water Sensitive Urban Design: Building the Water Sensitive Community, 21-23 Feb 2012, Melbourne, Australia.

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Abstract

The ability of rainwater systems to emulate pre-urban initial rainfall losses and restore catchment baseflow is investigated in Brisbane, Canberra and Melbourne, using low, medium and high rainwater demand scenarios, and adopting three 5 kL rainwater system configurations of: 1) Conventional; 2) Leaking - a fixed 1.25 kL leaking compartment; and 3) Adaptive rainwater diversion (ARD) - a variable leaking compartment responding to change in rainfall and rainwater demand. Baseflow is restored by leaking rainwater at the rate of 240 L/day. Storm initial loss is the sum of rainfall from the start of an event until the tank overflows. Results show the ARD system provides superior initial loss emulation, reduced mean annual overflow and increased baseflow, under the low demand scenario. Leaking and ARD systems provide similar results under the high demand scenario. However, the ARD system is recommended as rainwater demand can change with occupant water use habits. These stormwater management outcomes can potentially create an avenue for retrofitting WSUD in urban catchments and improving urban stream health, without duplicating or redesigning municipal services, and while maintaining an alternate water supply.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 Engineers Australia. Accepted version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 26 Jun 2013 01:04
Last Modified: 27 Sep 2017 03:04
Uncontrolled Keywords: rainwater diversion; WSUD retrofit; urban water security; urban stream health; urban hydrology
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050209 Natural Resource Management
12 Built Environment and Design > 1201 Architecture > 120104 Architectural Science and Technology (incl. Acoustics, Lighting, Structure and Ecologically Sustainable Design)
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective: D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management
URI: http://eprints.usq.edu.au/id/eprint/20875

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