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Water 2016, 8(8), 343;

A Simplified Model for Modular Green Roof Hydrologic Analyses and Design

Water Resources Engineer, Parsons Brinckerhoff, 1 E Pratt Street, Suite 300, Baltimore, MD 21202, USA
Civil & Environmental Engineering Departmemt and Water Resources Research Center, University of Hawai’i at Manoa, 2540 Dole Street, Holmes Hall 383, Honolulu, HI 96822, USA
Author to whom correspondence should be addressed.
Academic Editor: Brigitte Helmreich
Received: 16 May 2016 / Revised: 24 July 2016 / Accepted: 9 August 2016 / Published: 12 August 2016
(This article belongs to the Special Issue Urban Drainage and Urban Stormwater Management)
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Green roofs can mitigate urban rooftop stormwater runoff. However, the lack of accurate, physically-based performance assessment and design models has hindered their wide application. Most hydrologic or hydraulic models have no direct connection to the physical properties of green roof components such as media type/depth, drainage depth, etc. In an effort to assist design engineers, a simplified yet effective physically-based model was developed and calibrated with pilot data in order to provide green roof hydrologic performance curves to guide design. Precipitations with depths ranging from 0 to 40 cm and durations 30 to 1440 min were simulated for 21 green roof designs to determine the effects of common physical design parameters. Results revealed that effective capacity and transient capacity are the controlling factors for runoff volume reduction for single precipitation events. Including a water storage feature in the design increased cumulative long-term runoff reduction by an average of 23.5%, whereas increasing growth media depth yielded an average 5.3% improvement. Peak reduction and peak delay are governed by media depth and drainage opening size. Study results indicate that LEED criteria should be modified to require specific designer-controlled parameters of storage and media depth for the design storm to ensure desired performance. View Full-Text
Keywords: green roof; hydrologic performance; volume reduction; peak reduction; peak delay; LEED green roof; hydrologic performance; volume reduction; peak reduction; peak delay; LEED

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Li, Y.; Babcock, R.W. A Simplified Model for Modular Green Roof Hydrologic Analyses and Design. Water 2016, 8, 343.

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