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Optimization of Roof Coverage and Tank Size for Integrated Green Roof Rainwater Harvesting Systems-a Case Study

Author

Listed:
  • Haowen Xie

    (Zhejiang University of Water Resources and Electric Power)

  • Mark Randall

    (University of Copenhagen)

  • Sylvana Melo Santos

    (Federal University of Pernambuco)

Abstract

Rainwater harvesting (RWH) systems are effective in alleviating water supply shortages, while green roofs (GRs) can contribute to stormwater management, air quality improvement, thermal regulation of buildings, and biodiversity support. Despite their individual benefits, both systems are not frequently combined. This paper investigates the potential for integrating these systems through a hydrologic modeling and optimization approach, using a case study in Paris, France. The study utilized a Conceptual Interflow model (CI-model) coupled with a Water Balance (WB) model to describe the rainfall-runoff relationship of integrated green roof and rainwater harvesting (GR-RWH) systems. An NSGA-II optimization was then applied to the CI-WB model to determine the optimal tank sizing of GR-RWH systems for meeting different water demands. The results show that GR-RWH systems have water reliability (WR) values similar to those of traditional RWH systems without GR, albeit with larger tank volumes. For new buildings in Paris, a GR-RWH system with approximately 25 to 75% GR coverage meets rainwater utilization needs with low investment while also providing the added benefits of GRs.

Suggested Citation

  • Haowen Xie & Mark Randall & Sylvana Melo Santos, 2023. "Optimization of Roof Coverage and Tank Size for Integrated Green Roof Rainwater Harvesting Systems-a Case Study," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(12), pages 4663-4678, September.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:12:d:10.1007_s11269-023-03568-z
    DOI: 10.1007/s11269-023-03568-z
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    References listed on IDEAS

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    1. Suzanne Dallman & Anita M. Chaudhry & Misgana K. Muleta & Juneseok Lee, 2017. "Erratum to: The Value of Rain: Benefit-Cost Analysis of Rainwater Harvesting Systems," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 31(13), pages 4373-4374, October.
    2. Sara Lopes Souto & Ricardo Prado Abreu Reis & Marcus André Siqueira Campos, 2023. "Impact of Installing Rainwater Harvesting System on Urban Water Management," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(2), pages 583-600, January.
    3. Shengnan Yang & Laddaporn Ruangpan & Arlex Sanchez Torres & Zoran Vojinovic, 2023. "Multi-objective Optimisation Framework for Assessment of Trade-Offs between Benefits and Co-benefits of Nature-based Solutions," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(6), pages 2325-2345, May.
    4. Okoye, Chiemeka Onyeka & Solyalı, Oğuz & Akıntuğ, Bertuğ, 2015. "Optimal sizing of storage tanks in domestic rainwater harvesting systems: A linear programming approach," Resources, Conservation & Recycling, Elsevier, vol. 104(PA), pages 131-140.
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