Postearthquake Decision Making on Sewer Recovery and the Roles of Damage and Repair Data: Case Study of Christchurch, New Zealand
Publication: Journal of Infrastructure Systems
Volume 24, Issue 1
Abstract
Decision making on the reinstatement of the Christchurch sewer system after the Canterbury (New Zealand) earthquake sequence in 2010–2011 relied strongly on damage data, in particular closed circuit television (CCTV). This paper documents that process and considers how data can influence decision making. Data are analyzed on 33,000 pipes and 13,000 repairs and renewals. The primary findings are that (1) there should be a threshold of damage per pipe set to make efficient use of CCTV; (2) for those who are estimating potential damage, care must be taken in direct use of repair data without an understanding of the actual damage modes; and (3) a strong correlation was found between the ratio of faults to repairs per pipe and the estimated peak ground velocity. Taken together, the results provide evidence of the extra benefit that damage data can provide over repair data for wastewater networks and may help guide others in the development of appropriate strategies for data collection and wastewater pipe decisions after disasters.
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Acknowledgments
The financial support provided by the New Zealand Earthquake Commission (EQC) for this research is gratefully acknowledged.
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Information
Published In
Journal of Infrastructure Systems
Volume 24 • Issue 1 • March 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 25, 2015
Accepted: Jun 15, 2017
Published online: Nov 11, 2017
Published in print: Mar 1, 2018
Discussion open until: Apr 11, 2018
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