Sizing of Rainwater Storage Units for Green Building Applications
Publication: Journal of Hydrologic Engineering
Volume 12, Issue 2
Abstract
Green building design principles advocate the use of rainwater storage units to collect roof runoff during nonwinter seasons for landscaping, hardscape cleaning, and/or maintenance purposes, either in the form of rain barrels for smaller scale applications or cisterns for larger scale applications. This not only saves water which would otherwise be supplied from municipal water distribution systems but also reduces storm-water runoff which would otherwise be handled through urban storm-water management systems. The size of the storage units needs to be commensurate with the area of the roof and the desired water use rate. The local climate has an influence on the required size and achievable use rate as well. In this paper, analytical formulas are derived to estimate the required rainwater storage volume as a function of desired water use rate, reliability and local climate. In deriving these formulas, local climate characteristics are represented by probabilistic models and incorporated into the stochastic description of storage unit operating procedures and requirements. The resulting formulas may be used by engineers, architects, municipal governments, and storage unit manufactures for the estimation or recommendation of suitable rainwater storage unit sizes.
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Acknowledgments
This work has been supported by the Natural Sciences and Engineering Research Council of Canada. The comments made by the three anonymous reviewers and the associate editor helped in improving this paper and are very much appreciated. Mr. R. Lin assisted in performing the statistical tests.
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Information & Authors
Information
Published In
Journal of Hydrologic Engineering
Volume 12 • Issue 2 • March 2007
Pages: 197 - 205
Copyright
© 2007 ASCE.
History
Received: Jun 1, 2005
Accepted: Jun 22, 2006
Published online: Mar 1, 2007
Published in print: Mar 2007
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