Building Water Sensitive Urban Design : Modelling of Green Roof
This project evaluates green roofs as a stormwater management tool. The goal of the project is to develop a computer aided stormwater model incorporating green roof, and evaluate its effectiveness. Specifically, the influence of media type, media depth, duration of rainfall event and average reoccurrence interval are investigated in design rainfall. The finalised model is then validated based on observed rainfall for the months of January and February of 2014. Results indicate that the green roofs are capable of removing 73.5% and 86.9% of the monthly rainfall volumes for January and February 2014, respectively, from a roof through retention. Water retention by green roofs effectively increases the time to reach the peak runoff, and slows the peak flows for a watershed. There are seasonal considerations as more runoff is generated during the month of January (northeast monsoon season) compared with the month of February (normal weather). Green roof is also effective in retaining 100% of several storms of less than 10 mm. The results demonstrate that the proposed extensive green roof for the study area functions as an excellent bio-retention system for stormwater control. The results of this research are in tandem with those of other researches performed throughout the world on hydrologic characteristics of green roof.
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M. Annika, "Green Roof in Seattle- A Survey of Vegetated Roof & Rooftop Gardens". Department of Planning and Development, City of Seattle, 2010.
V. Vandermeulen, A. Verspecht, B. Vermeire, G. Van Huylenbroeck, and X. Gellynck, "The use of economic valuation to create public support for green infrastructure investments in urban area," Landscape and Urban Planning 103(2), 2011, 198-206.
Volder, Astrid, and Dvorak, "Event size, substrate water content and vegetation affect storm water retention efficiency of an un-irrigated extensive green roof system in Central Texas," Sustainable Cities and Society 10, 2014, 59-64.
G. W. Christopher, and W. W. Wendy, "Green Roof Specifications and Standards," 56(8). USA, 2003.
J. Jacklyn, and N. John, "Building Green: A Guide to Using Plants on Roofs, Walls and Pavements". London, England: Greater London Authority, 2004.
W. Allan, "The Filter, Drain, and Water Holding Components of Green Roof Design". America: Colbond, Inc, 2005.
Center for Neighbourhood Technology. "The Value of Green Infrastructure," A Guide to Recognising Its Economic, Environmental and Social Benefits. North Avenue, Chicago, 2010.
B. Hunt, G. Jennings, and A. Moran, "A North Carolina Field Study to Evaluate Green Roof Runoff Quantity, Runoff Quality, and Plant Growth". North Carolina State University, Department of Biological and Agricultural Engineering, 2004.
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