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Retrofitting urban drainage capacity to cope with change: A case study for Nhieu Loc - Thi Nghe Basin change in Ho Chi Minh city



Inherent uncertainties are the main matter of constrain and concern for any fool proof urban flood management programme. Selection of better retrofitting options to tackle uncertainties involves the process of evaluating the technical and financial feasibility of wide range of options. In this paper, we present a case study of a catchment in Ho Chi Minh City, Vietnam, where we apply evolutionary methods to search for optimal retrofitting opportunities to cope with uncertainties. Flexible options such as detention storage at nodes and provision of sustainable urban drainage systems have been identified. The optimal storage volumes for detention storage at the nodes and optimal coverage areas for sustainable drainage options to prevent flooding in Nhieu Loc – Thi Nghe basin have been arrived at by integrating optimization techniques and a storm water management model. This case study demonstrates and paves the way for considering combined hydraulic modelling along with optimization approach as the first step towards incorporating flexibility into urban drainage systems.
... Retrofitting is an essential aspect of the operation and maintenance of infrastructure in the urban water cycle. It is a practical way to overcome the deficits in current service levels; adapting to climate variation and climate change; and, to improve the livability and aesthetics of the city (Dixon & Eames, 2013;Radhakrishnan et al., 2014). Retrofitting urban drainage systems comprises replacing or renewing old drainage infrastructure, such as pipes, gates, pumps, detention areas and wetlands, and building new infrastructure. ...
Upgrading urban services and maintaining their functionality, such as drainage systems, in a sustainable manner to keep up with the increasing demand and changing needs, like climate adaptation and socio-economic conditions, is a planning, implementation and management challenge. Retrofitting urban infrastructure is a socio-technical process like planned or autonomous adaptation, where the motivation and ability of the stakeholders should be ascertained to avoid implementation bottlenecks. This paper aims at improving the understanding of institutional decision making for implementing retrofitting responses using the Motivation and Abilities (MOTA) framework. Motivation and abilities of the stakeholders to retrofit the urban drainage system in Ho Chi Minh City for maintaining the service levels in a changing climate urbanization were explored. The MOTA scores, based on stakeholder consultation and surveys, were obtained for retrofitting responses. The analysis of MOTA scores revealed that the motivation and ability of the stakeholders differed based on the adaptation objectives for planning and implementing drainage retrofitting responses. Hence it is recommended to use MOTA framework as a practical means to explore the inherent biases and internal processes of various actors to understand and communicate the need to integrate decision making in a sustainable manner.
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