Evaluating a spreadsheet model to predict green roof stormwater management

A. R. Jarrett, W. F. Hunt, Robert Berghage, Jr.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The departments of Agricultural and Biological Engineering and Horticulture at the Pennsylvania State University have combined efforts to quantify the stormwater attenuation capabilities of extensive green-roof systems. This green-roof system consisted of a roof with a conventional flat-roof covering, a 0.5-in thick Enka-drainage layer, 3.5 in of porous medium, and Sedum spurium planted 3.0 in on center. The combined layers of this green roof had a maximum retention of 1.5 in and a saturated hydraulic conductivity of 0.43 in/s. The green roof system was modeled using a checkbook approach with daily rainfall depth as an input and ET and runoff as the outputs. The AGRR model was applied to 28 years (1976-2003) of rainfall data in Raleigh, NC, and showed that 45% of the annual rainfall volume (depth) can be retained on the green roof. Increasing the volume of storage does not improve the roofs ability to retain rain water. Providing only 0.125 in of roof storage will still cause over 30% of the annual rain depth to be retained on the roof.

Original languageEnglish (US)
Title of host publicationLow Impact Development
Subtitle of host publicationNew and Continuing Applications - Proceedings of the 2nd National Low Impact Development Conference 2007
Pages252-259
Number of pages8
Volume331
DOIs
StatePublished - Dec 1 2008
Event2nd National Low Impact Development Conference 2007: New and Continuing Applications - Wilmington, NC, United States
Duration: Mar 12 2007Mar 14 2007

Other

Other2nd National Low Impact Development Conference 2007: New and Continuing Applications
CountryUnited States
CityWilmington, NC
Period3/12/073/14/07

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

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  • Cite this

    Jarrett, A. R., Hunt, W. F., & Berghage, Jr., R. (2008). Evaluating a spreadsheet model to predict green roof stormwater management. In Low Impact Development: New and Continuing Applications - Proceedings of the 2nd National Low Impact Development Conference 2007 (Vol. 331, pp. 252-259) https://doi.org/10.1061/41007(331)23