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Development and modelling of realistic retrofitted Nature-based Solution scenarios to reduce flood occurrence at the catchment scale

Chen, Valerie ; Bonilla Brenes, Jose Ricardo ; Chapa, Fernando ; Hack, Jochen (2021):
Development and modelling of realistic retrofitted Nature-based Solution scenarios to reduce flood occurrence at the catchment scale.
In: Nature-based Solutions in River Landscapes, In: Ambio, Springer, ISSN 0044-7447,
DOI: 10.1007/s13280-020-01493-8,
[Article]

Abstract

Decentralized Nature-based Solutions such as Urban Green Infrastructures (UGI) are increasingly promoted to reduce flooding in urban areas. Many studies have shown the effectiveness of flood control of UGI at a plot or neighbourhood level. Modelling approaches that extrapolate their flood reducing impact to larger catchment scales are often based on a simplistic assumption of different percentages of UGI implementation. Additionally, such approaches typically do not consider the suitable space for UGI and potential implementation constraints. This study proposes a scenario development and modelling approach for a more realistic upscaling of UGI based on empirical insights from a representative neighbourhood. The results from this study, conducted in the metropolitan area of Costa Rica, show that upscaling the full potential for UGI could significantly reduce surface runoff, peak flows, and flood volumes. In particular, the permeable pavement has the highest potential for flood reducing in public space while cisterns perform best at the property level. These results can guide the formation of policies that promote UGI.

Item Type: Article
Erschienen: 2021
Creators: Chen, Valerie ; Bonilla Brenes, Jose Ricardo ; Chapa, Fernando ; Hack, Jochen
Title: Development and modelling of realistic retrofitted Nature-based Solution scenarios to reduce flood occurrence at the catchment scale
Language: English
Abstract:

Decentralized Nature-based Solutions such as Urban Green Infrastructures (UGI) are increasingly promoted to reduce flooding in urban areas. Many studies have shown the effectiveness of flood control of UGI at a plot or neighbourhood level. Modelling approaches that extrapolate their flood reducing impact to larger catchment scales are often based on a simplistic assumption of different percentages of UGI implementation. Additionally, such approaches typically do not consider the suitable space for UGI and potential implementation constraints. This study proposes a scenario development and modelling approach for a more realistic upscaling of UGI based on empirical insights from a representative neighbourhood. The results from this study, conducted in the metropolitan area of Costa Rica, show that upscaling the full potential for UGI could significantly reduce surface runoff, peak flows, and flood volumes. In particular, the permeable pavement has the highest potential for flood reducing in public space while cisterns perform best at the property level. These results can guide the formation of policies that promote UGI.

Journal or Publication Title: Ambio
Series Name: Nature-based Solutions in River Landscapes
Publisher: Springer
Uncontrolled Keywords: Green urban rivers, Infrastructure, LID, Nature-based solutions, Stormwater management, Upscaling
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Ecological Engineering
TU-Projects: Bund/BMBF|01UU1704|SEE-URBAN-WATER
Date Deposited: 28 Jan 2021 06:21
DOI: 10.1007/s13280-020-01493-8
Official URL: http://link.springer.com/10.1007/s13280-020-01493-8
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