A global analysis approach for investigating structural resilience in urban drainage systems
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Water research
Abstract
Building resilience in urban drainage systems requires consideration of a wide range of threats that
contribute to urban flooding. Existing hydraulic reliability based approaches have focused on quantifying
functional failure caused by extreme rainfall or increase in dry weather flows that lead to hydraulic overloading
of the system. Such approaches however, do not fully explore the full system failure scenario space due to
exclusion of crucial threats such as equipment malfunction, pipe collapse and blockage that can also lead to
urban flooding. In this research, a new analytical approach based on global resilience analysis is investigated
and applied to systematically evaluate the performance of an urban drainage system when subjected to a wide
range of structural failure scenarios resulting from random cumulative link failure. Link failure envelopes,
which represent the resulting loss of system functionality (impacts) are determined by computing the upper and
lower limits of the simulation results for total flood volume (failure magnitude) and average flood duration
(failure duration) at each link failure level. A new resilience index that combines the failure magnitude and
duration into a single metric is applied to quantify system residual functionality at each considered link failure
level. With this approach, resilience has been tested and characterized for an existing urban drainage system in
Kampala city, Uganda. In addition, the effectiveness of potential adaptation strategies in enhancing its resilience
to cumulative link failure has been tested.
Description
Keywords
flexibility, redundancy, resilience, structural failure, urban water management
Citation
Mugume, S. N., Gomez, D. E., Fu, G., Farmani, R., & Butler, D. (2015). A global analysis approach for investigating structural resilience in urban drainage systems. Water research, 81, 15-26.10.1016/j.watres.2015.05.030