Selecting a green roof media to minimize pollutant loadings in roof runoff

Brett Long, Shirley E. Clark, Katherine H. Baker, Robert Berghage

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

1 Scopus citations

Abstract

Green roofs are a best management practice for urban areas where land for traditional stormwater practices is unavailable. The two primary research objectives are the following: (1) To develop an effective media for green roofs that will improve roof runoff quality while maintaining the known water retention benefits of green roofs, and (2) To demonstrate that green roofing will generate lesser pollutant loadings into urban runoff than traditional roofing materials. In Phase I (currently ongoing), several green roof media (formulated from commonly-used expanded minerals, stormwater filter media, and organic matter) are being evaluated for their abilities to retain the pollutants from a synthetic acid rain. The samples are being analyzed for metals, nutrients, pH, and conductivity. The hypothesis is that one media will be "better" at pollutant removal and permanent retention. In Phase II, once the optimized media has been selected, it will be field-tested on a green roof. The water quality of the runoff from the green roof will be compared with the runoff quality from a traditional roof. Phase I results on the mineral portion of the future media mix demonstrates all media were able to neutralize the acid rain. Comparing the media for pollutant removal and retention, the expanded shale was best able to retain phosphorus, ammonia, and metals from the synthetic acid rain. Phase I results on the mineral and additive combinations show the expanded shale and granulated activated carbon mix to be the most effective at pollutant removal and retention.

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
Pages260-274
Number of pages15
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

Publication series

NameLow Impact Development: New and Continuing Applications - Proceedings of the 2nd National Low Impact Development Conference 2007
Volume331

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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