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  4. Vertical Retention Bodies for Rainwater Retention and Microclimate Improvement - Proof of Concept
 
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2025
Journal Article
Title

Vertical Retention Bodies for Rainwater Retention and Microclimate Improvement - Proof of Concept

Abstract
This study examines the use of vertical retention bodies for water retention in urban areas. The growing challenges of climate change and its impact on the hydrologic cycle are bringing increased attention to the management of heavy rainfall events and the reduction of the urban heat island effect. The "sponge city" concept offers solutions for local water storage in urban areas as a contribution to climate adaptation. This paper addresses the largely untapped potential of vertical systems and presents a proof of concept for a vertical water storage system. An experimental setup is presented to investigate the water storage capacity of vertical retention bodies using two storage substrates (perlite and vermiculite) with the aim of storing the water accumulating on the roof in the vertical retention body. Under heavy rainfall conditions, maximum water storage capacities of up to 194% for perlite and up to 250% for vermiculite were determined. The findings were then assessed to determine the potential for using retention bodies on building facades. This proof of concept demonstrates the application potential of vertical retention bodies as one component of the sponge city concept. The retention bodies contribute to water storage during heavy rainfall events, the cooling effect of water evaporation and the preservation of the local water cycle.
Author(s)
Quarz, Paul
Fraunhofer-Institut für Umwelt-, Sicherheits- und Energietechnik UMSICHT  
Eiting, Melanie
Fraunhofer-Institut für Umwelt-, Sicherheits- und Energietechnik UMSICHT  
Schmitz, Daniela
RWTH Aachen  
Wack, Holger  
Fraunhofer-Institut für Umwelt-, Sicherheits- und Energietechnik UMSICHT  
Journal
Journal of sustainable architecture and civil engineering  
Open Access
DOI
10.5755/j01.sace.37.1.37322
Additional full text version
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Language
English
Fraunhofer-Institut für Umwelt-, Sicherheits- und Energietechnik UMSICHT  
Keyword(s)
  • vertical water sponge

  • urbane Energiesysteme

  • Regenabfluss

  • sponge city

  • water management

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