Many consider storm water runoff mitigation to be the primary benefit of green roofs due to the prevalence of impervious surfaces in urban and commercial areas and a failing storm water management infrastructure. Case studies of greens roofs done by engineering group Magnusson Klemencic Associates to quantify the costs of green roofs and the amount of runoff they create. Optimal soil cover was found to be four inches deep—a depth that would allow plant to take root, but also provide a volume through which it is easy for water to evaporate through. The studied roofs mitigated runoff from 65 to 94%, meaning that in best conditions, only 6% of rainfall became runoff, and cost of adding a green roof to a building costs about seven dollars per square foot. Another study shows that average percentage of roof rainfall retention ranged from 48.7% (gravel) to 82.8% (vegetated), highlighting that the significant element in retaining the storm water was the goring medium (soil), rather than the plants.
Monday, May 27, 2013
Week #6 Progress Report 5/8/13
During week six we began to solidify the draft of our paper, adding in the "engineering" aspects of the project the project. According to the revised project weekly schedule the goals for Week 6 consist of purchasing the new materials needed for a 3-D model: sand, soil and vegetation, and beginning the construction of the model. The model will represent the different layers involved in building a green roof. The green roof is a project made viable by its many benefits: these include storm water management, extending roof life, and regulating building temperature.
Many consider storm water runoff mitigation to be the primary benefit of green roofs due to the prevalence of impervious surfaces in urban and commercial areas and a failing storm water management infrastructure. Case studies of greens roofs done by engineering group Magnusson Klemencic Associates to quantify the costs of green roofs and the amount of runoff they create. Optimal soil cover was found to be four inches deep—a depth that would allow plant to take root, but also provide a volume through which it is easy for water to evaporate through. The studied roofs mitigated runoff from 65 to 94%, meaning that in best conditions, only 6% of rainfall became runoff, and cost of adding a green roof to a building costs about seven dollars per square foot. Another study shows that average percentage of roof rainfall retention ranged from 48.7% (gravel) to 82.8% (vegetated), highlighting that the significant element in retaining the storm water was the goring medium (soil), rather than the plants.
Many consider storm water runoff mitigation to be the primary benefit of green roofs due to the prevalence of impervious surfaces in urban and commercial areas and a failing storm water management infrastructure. Case studies of greens roofs done by engineering group Magnusson Klemencic Associates to quantify the costs of green roofs and the amount of runoff they create. Optimal soil cover was found to be four inches deep—a depth that would allow plant to take root, but also provide a volume through which it is easy for water to evaporate through. The studied roofs mitigated runoff from 65 to 94%, meaning that in best conditions, only 6% of rainfall became runoff, and cost of adding a green roof to a building costs about seven dollars per square foot. Another study shows that average percentage of roof rainfall retention ranged from 48.7% (gravel) to 82.8% (vegetated), highlighting that the significant element in retaining the storm water was the goring medium (soil), rather than the plants.
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