International Low Impact Development Conference China 2016
Hydrologic Design and Economic Benefit Analysis of Rainwater Harvesting Systems in Shanghai, China
Publication: International Low Impact Development Conference China 2016: LID Applications in Sponge City Projects
ABSTRACT
Innovative stormwater management strategies (e.g., the low impact development, the water sensitive urban design, and the sponge city) advocate the use of rainwater harvesting systems to collect rainwater for non-potable water uses such as irrigation, washing, or toilet flushing. It not only alleviates the pressure of urban water supply but also reduces stormwater runoff which would otherwise be handled through urban stormwater management systems. Sizing the storage units is a key problem in the hydrologic design of rainwater harvesting systems. In this study, a spreadsheet based daily water balance model was developed to analyze the performances and benefits of rainwater harvesting systems with different storage unit sizes. This model considers daily rainfall data, contributing roof area, rainfall loss factors, design storage capacity, overflow, and daily rainwater demand and can be used to determine stormwater capture efficiency, tap water replacement rate, water supply reliability, benefit-cost rate, and the optimum storage capacity of a rainwater harvesting system. Daily rainfall data from 1984 to 2013 and a multi-story residential building and the lawns surrounding it in Pudong District of Shanghai was taken as an example to illustrate the application of this model. The resulting formulas and procedures may be used by engineers and municipal governments for the estimation or recommendation of suitable rainwater storage unit size.
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ACKNOWLEDGMENTS
This work has been supported by the Fundamental Research Funds for the Central Universities (YX2015-18,2015ZCQ-SB-01, and 2016ZCQ06) and the National Natural Science Foundation of China (51609004).
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Information & Authors
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Published In
International Low Impact Development Conference China 2016: LID Applications in Sponge City Projects
Pages: 381 - 389
Editors: Haifeng Jia, Ph.D., Tsinghua University, Shaw L. Yu, Ph.D., University of Virginia, Robert Traver, Ph.D., Villanova University, Huapeng Qin, Ph.D., Peking University Shenzhen Graduate School, Junqi Li, Ph.D., Beijing University of Civil Engineering and Architecture, and Mike Clar, Ecosite, Inc.
ISBN (Online): 978-0-7844-8104-2
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© 2017 American Society of Civil Engineers.
History
Published online: Dec 4, 2017
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