Green Roofs Influence on Stormwater Quantity and Quality: A Review (original) (raw)
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Evaluation of green roof performances for stormwater quantity and quality controls
Rapid urbanization in the recent decades has quickly fuelled up the process of global warming. Many mitigation measures have been formulated and implemented in order to tackle the effect of global warming. Green roofs (roof with vegetated cover) have been proposed and implemented by various countries as one of the new environmentally friendly innovation. This paper evaluates the qualitative and quantitative performances of an extensive green roof system under tropical climate. Simulations showed that the peak discharge of stormwater run-off was reduced up to 26% in relation to concrete tile roof. Its reduction ability was decreased for storms with intense rainfall. Increment of pH was observed for the green roof run-off, and the runoff quality ranged between class I and II under Malaysia National Water Quality Index (WQI). High concentrations of phosphate were observed in the run-off samples, which showed that substrates (fertilized planting soil) might be the potential contributor. Findings indicated that there was a reduction up to around 5% for indoor temperature of the building after installation of the extensive green roof system.
2011
As a result of widespread urban development and replacing natural vegetative surface with nonpervious pavement, the Earth's natural water cycle is disrupted and water can no longer permeate back into the ground. This disruption forces stormwater over parking lots and city streets, into storm drains and eventually into rivers and streams. If the stormwater system is combined with wastewater lines, then a rain event will likely lead to even greater levels of dangerous contaminants to the health of people and the environment. Not only is contamination of the water an issue, but also the overwhelming quantity of water that flows into creeks during a rainstorm leads to flash flooding and bank erosion. This research examines green roofs-vegetative surfaces on the roof of buildings-in urban environments, specifically the campus of The Ohio State University, as a solution to the overburden and pollution of stormwater runoff. Through literature review, data collection, case study and industry interviews, this honors project report discusses green roofs as a stormwater management strategy with consideration of growing climate in Columbus, OH.
STORMWATER RUNOFF MITIGATION ON EXTENSIVE GREEN ROOF: A REVIEW ON TRENDS AND FACTORS
South East Asian Technical Universities Consortium (SEATUC), 2012
This paper aims to provide a broad overview on research trend and factors contributing towards green roof performance in mitigating urban stormwater runoff. Nineteen papers were selected and examined for trends on research concern and factors attributing towards stormwater runoff mitigation. The factors are then discussed based on stormwater runoff measurements reported and existing literatures in the field. The research trend on green roof stormwater mitigation has evolved around the factors that could delay peak water runoff and increase retention period. Researchers have identified substrate depth, slope, climate, vegetation and green roof age as the significant factors attributing stormwater runoff mitigation. Wide research gap have been identified on the role of vegetation hydrology management and green roof performance on regions other than temperate climate providing opportunity for further research and experiments.
Evaluation of Green Roof as Green Technology for Urban Stormwater Quantity and Quality Controls
Nowadays, people mutually recognise that global warming is actually a fact rather just a scientific theory and it has been fuelled up quickly as resulted from rapid urbanisations. Driven by environmental needs, green building index (GBI) was established in Malaysia to drive the initiative to lead the property industry towards becoming more environmental friendly. Green roofs (roof with vegetated cover), as one of the assessment criteria of GBI, are gaining attention in the Malaysian society as a versatile new environmental friendly mitigation technology. This paper evaluates the qualitative and quantitative performances of extensive green roof at Humid Tropics Center under local tropical climate. Simulations showed that the peak discharge was reduced up to 26% in relation to impervious brown roof. Its reduction ability decreased for storms with intense rainfall. Increment of pH was observed for the green roof runoff and the runoff water quality ranged between class I and II under WQI. High concentrations of phosphate were noticed in the runoff samples and substrates (fertilised planting soil) might be the potential contributor. Findings indicate that there was a reduction of approximately 1.5°C for indoor temperature of the building after installation of the extensive green roof.