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

Haowen Xie (), Mark Randall and Sylvana Melo Santos
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Haowen Xie: Zhejiang University of Water Resources and Electric Power
Mark Randall: University of Copenhagen
Sylvana Melo Santos: Federal University of Pernambuco

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2023, vol. 37, issue 12, No 5, 4663-4678

Abstract: 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.

Keywords: Green roof; Runoff modelling; Optimization analysis; Economic feasibility; Rainwater harvesting; Return on investment period (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11269-023-03568-z

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