Cost-Effective Optimization of Nature-Based Solutions for Reducing Urban Floods Considering Limited Space Availability

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Apoorva Sing
  • Arup Kumar Sarma
  • J. Hack

External Research Organisations

  • Technische Universität Darmstadt
  • Indian Institute of Technology Guwahati (IITG)
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Details

Original languageEnglish
Pages (from-to)297-319
Number of pages23
JournalEnvironmental Processes
Volume7
Issue number1
Publication statusPublished - 24 Jan 2020
Externally publishedYes

Abstract

The conventional urban stormwater management practices focus on carrying away runoff quickly by lined conveyors, which increase the surface runoff and reduce the time of concentration, subsequently causing floods in downstream areas. Ecological Management Practices (EMPs) provide nature-based solutions for reducing flood risks in a sustainable and economically viable manner. However, in the rapidly urbanizing setups in developing nations, the application of EMPs is limited due to space availability, data scarcity and limited funding. This study uses a Non-Linear Programming Optimization Technique to provide modelling solutions in optimizing the land-use and costs under EMPs to reduce flood risks in the Quebrada Aries watershed in the Municipality of Heredia in Costa Rica. Depending on the availability and ease of execution, a combination of three EMPs (bio-retention areas, infiltration trenches and green roofs) were tested. The effect of the application of derived optimal combinations has been analysed. The optimal combination of EMPs analysed for different channel capacity was able to reduce the peak discharge for the worst flood causing event of 50 years return period from 16.86 m 3/s (under current land-use) to 9 m 3/s, 9.51 m 3/s, 8.38 m 3/s and 9.13 m 3/s in four hypothetical scenarios considered. In urbanized catchments, EMPs cannot be applied indefinitely to avoid floods. However, an optimal combination of EMPs can drastically reduce the requirement of large capacity drainage channels. This information can help policy-makers to analyse trade-offs between urban development and flood control measures. The study is suitable for other data-scarce regions as well.

Keywords

    Ecological Management Practices, Nature-based solutions, Non-linear programming optimization, Urban stormwater management

ASJC Scopus subject areas

Sustainable Development Goals

Cite this

Cost-Effective Optimization of Nature-Based Solutions for Reducing Urban Floods Considering Limited Space Availability. / Sing, Apoorva; Sarma, Arup Kumar; Hack, J.
In: Environmental Processes, Vol. 7, No. 1, 24.01.2020, p. 297-319.

Research output: Contribution to journalArticleResearchpeer review

Sing A, Sarma AK, Hack J. Cost-Effective Optimization of Nature-Based Solutions for Reducing Urban Floods Considering Limited Space Availability. Environmental Processes. 2020 Jan 24;7(1):297-319. doi: 10.1007/s40710-019-00420-8
Sing, Apoorva ; Sarma, Arup Kumar ; Hack, J. / Cost-Effective Optimization of Nature-Based Solutions for Reducing Urban Floods Considering Limited Space Availability. In: Environmental Processes. 2020 ; Vol. 7, No. 1. pp. 297-319.
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