Stormwater Mitigation and Surface Temperature Reduction by Green Roofs

DeNardo, J. C.; Jarrett, A. R.; Manbeck, H. B.; Beattie, David; Berghage, Robert

doi:10.13031/2013.19181

Cited by 144 publications

(76 citation statements)

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“…Other studies have focused on the evaporative cooling effect provided by a variety of green roof systems (Lazzarin et al 2005;Onmura et al 2001;Saiz et al 2006). Energy studies have also demonstrated how green roofs can act as an additional layer of insulation for the building (DeNardo et al 2005;Niachou et al 2001;Kumar and Kaushik 2005).…”

Section: Energy and Temperaturementioning

confidence: 99%

Ecological impacts of replacing traditional roofs with green roofs in two urban areas

Carter¹,

Butler²

2008

CATE

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Urban land cover is dominated by impervious surface that degrades both terrestrial and aquatic ecosystems relative to predevelopment conditions. There are significant opportunities for designers of urban landscapes to use alternative land covers that have multiple functions, benefiting both human and nonhuman components of the urban ecosystem. Vegetated (green) roofs are one form of alternative land cover that has shown the potential to provide a variety of ecological benefits in urban areas. We evaluated how stormwater retention, building energy and temperature, and rooftop habitat are influenced by the use of green roofs using test plots in Georgia and Massachusetts. Green roofs were shown to recreate part of the predevelopment hydrology through increasing interception, stormwater storage, evaporation, and transpiration on the rooftop and worked extremely well for small storm events. Temperature reductions were found on the green rooftop as compared to an asphalt surface, although other roof technologies that minimize temperatures, such as lighter colored membranes, provide similar benefits. Novel habitat was created on the rooftop, although the extent of this habitat was limited in part by plant survivability and the need for additional water inputs for diverse plant communities to survive. Despite the challenges, the green roof benefits reported here suggest that green roofs can be used effectively as a multifunctional land cover in urban areas.

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Section: Energy and Temperaturementioning

confidence: 99%

Ecological impacts of replacing traditional roofs with green roofs in two urban areas

Carter¹,

Butler²

2008

CATE

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“…Maximum temperatures in roof system S1 were reduced by 7.1°C on average, minimum temperatures by 1.2°C compared to pebble drain (T DRAIN ). For the newly established test systems this benefit is probably T S2 T DRAIN doi: 10.17221/17/2015-SWR slightly reduced due to sparse vegetation cover since the temperature reduction is caused by evaporation and the associated latent heat flux (Denardo et al 2005). Another explanation of the dissimilar thermal regime in the segments is associated with the soil substrates characteristics.…”

Section: Resultsmentioning

confidence: 99%

A green roof segment for monitoring the hydrological and thermal behaviour of anthropogenic soil systems

Jelínková¹,

Dohnal²,

Picek³

2015

Soil & Water Res.

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Jelínková V., Dohnal M., Picek T. (2015): A green roof segment for monitoring the hydrological and thermal behaviour of anthropogenic soil systems. Soil & Water Res., 10: 262-270.Green roofs and similar anthropogenic soil-plant systems in conurbations have a high relevance for society, especially in a changing climate. Understanding the hydrological performance of green roof substrates is a significant task in the framework of sustainable urban planning and water/energy management in urban areas. Potential retention and detention capabilities of anthropogenic, light weight, highly permeable soil systems and their continued performance over time are of major importance. A green roof test segment was designed to investigate the benefits of such anthropogenic systems. This adaptable low-cost system allows for long-term monitoring of preferred characteristics. Temperature and water balance measurements complemented with meteorological observations and studies of physical properties of substrates provide a basis for a detailed analysis of thermal and hydrological regime in green roof systems. The very first results obtained from the test segment have confirmed the green roof systems benefits. Reduced temperature fluctuations as well as rainfall runoff were attained compared to the traditional roof systems. Depending on numerous factors including the substrate material or vegetation cover, in the green roof tested the temperature amplitude for a selected period of nonfreezing days (with minimum ambient air temperature of 2.8°C) was suppressed by about 6.5°C on average. The ability to completely prevent (light rainfall events) or reduce and delay (medium and heavy rainfall events) the peak runoff was demonstrated, too.

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“…In view of the fact that the rainwater outflow rate is affected by many factors related to local climate, precipitation profile, and the structure of the roof itself, results of various studies differ from each other in many cases. This is the case especially when the roof retentiveness is determined; its value, according to Getter et al, can be as high as 80.8% [20], compared with 45% obtained by DeNardo et al for the same roof [21]. In research work on this subject it is essential that such circumstances will be taken into account as facility location and the related precipitation profile typical for the area, especially precipitation total distribution in time, frequency of occurrence, and intensity.…”

Section: A Review Of Studies On Rainwater Management Methodsmentioning

confidence: 97%

A LCC Analysis of Rainwater Management Variants

Słyś¹,

Stec²,

Zeleňáková³

2012

Ecological Chemistry and Engineering S

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Abstract:The paper presents results of the Life Cycle Cost (LCC) analysis carried out for several variants of rainfall water management in a newly designed multi-family dwelling house. According to the LCC methodology, calculations were performed for the whole undertaking life cycle with both investment outlays and operation/maintenance costs taken into account. The LCC analysis was carried out, in particular, for a variant assuming that the rainwater collected from the roof will be entirely discharged to the sewage system. On the other hand, the second variant provided for replacement of traditional building roof with a green one. Facilities of that type, thanks to their retention properties, may delay runoff of rainwater and reduce the overall quantity of water discharged from roof surface and therefore can be classified as Sustainable Urban Drainage Systems. In the third case considered, rainwater is to be utilised in the building. It was assumed that precipitation water will be stored in a tank and used in the sanitary water supply system for flushing toilets, thus reducing the overall tap water purchase costs.

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Stormwater Mitigation and Surface Temperature Reduction by Green Roofs

Cited by 144 publications

References 0 publications

Ecological impacts of replacing traditional roofs with green roofs in two urban areas

Ecological impacts of replacing traditional roofs with green roofs in two urban areas

A green roof segment for monitoring the hydrological and thermal behaviour of anthropogenic soil systems

A LCC Analysis of Rainwater Management Variants

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