A Simple Method For Sizing Modular Green–Blue Roof Systems For Design Storm Peak Discharge Reduction
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A Simple Method For Sizing Modular Green–Blue Roof Systems For Design Storm Peak Discharge Reduction

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  • Journal Title:
    SN Applied Sciences
  • Personal Author:
  • NOAA Program & Office:
  • Sea Grant Program:
    SCSGC (South Carolina Sea Grant)
  • Description:
    Typical green roof systems are used to improve downstream water quality and reduce long-term total runoff. However, they perform poorly at peak discharge reduction during large design storm events. This performance can be significantly improved by the addition of storage a layer (blue roof) underneath a green roof system. This paper presents a simple design methodology for designing modular green–blue roof systems to reduce this peak discharge. In particular, the methodology can be used for the preliminary design of the blue roof module’s outflow control sizing. It is then shown how the resulting design can be incorporated into a standard hydrologic modeling system for a more detailed analysis. Results of an example design show that the addition of just 3.8 cm (1.5 in) of storage can result in a 38.6% reduction in peak discharge for a rainfall depth of 17.2 cm (6.78 in) compared to a green roof without underlying storage. Increasing the storage depth to 7.6 cm (3 in) for the same storm resulted in a 78.2% reduction of peak discharge.
  • Keywords:
  • Source:
    N Appl. Sci. 2, 1874
  • DOI:
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA14OAR4170088
  • Rights Information:
    Accepted Manuscript
  • Rights Statement:
    The NOAA IR provides access to this content under the authority of the government's retained license to distribute publications and data resulting from federal funding. While users may legally access this content, the copyright owners retain rights that govern the reproduction, redistribution, and re-use of this work. The user is solely responsible for complying with applicable copyright law.
  • Compliance:
    Submitted
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