This paper offers a quantitative assessment of the storm water and air quality benefits provided by green roofs at various coverage scenarios in Washington DC. The goals of this research include 1 quantify the contribution green roofs can make towards improving air and water quality in the District of Columbia, 2 access benefits at difference coverage scenarios and propose a green roof coverage objective to form the basis of a Green Roof Vision for DC, and 3 identify nest steps and areas for further study. Results from this study indicate that extensive green roof systems can reduce runoff volumes by 65 percent, while intensive green roof systems can reduce runoff volume by as much as 85 percent. Assuming an 80 percent use of extensive and 20 percent use of intensive green roof systems on buildings exceeding 10, sf the District of Columbia could reasonably expect a runoff volume decrease of 69 percent.
Environmental benefits[ edit ] A modern green roof at California Academy of Sciencesconstructed for low maintenance by omitting many native plant species in favor of the hardiest varieties  Thermal reduction and energy conservation[ edit ] Green roofs improve and reduce energy consumption.
Green roofs are a type of low impact development. The Chicago City Hall green roof is one of the earliest and most well-known examples of green roofs in the United States; it was planted as an experiment to determine the effects a green roof would have on the microclimate of the roof.
Following this and other studies, it has now been estimated that if all the roofs in a major city were greened, urban temperatures could be reduced by as much as 7 degrees Celsius. See the PDF at  for more information. Green roofs decrease the total amount of runoff and slow the rate of runoff from the roof.
Often, phosphorus and nitrogen are in this category of environmentally harmful substances even though they are stimulating to the growth of plant life and agriculture. When these substances are added to a system, it can create mass biological activity since they are considered limiting factors of plant growth and by adding more of them to a system, it allows for more plant growth.
Department of Health storm-water regulations Ecological benefits[ edit ] Green roofs create natural habitat as part of an urban wilderness. A recent list of the bee species recorded from green roofs worldwide highlights both the diversity of species, but also the expected bias towards small ground-nesting species Hofmann and Renner, Rooftop greenery complements wild areas by providing stepping stones for songbirds, migratory birds and other wildlife facing shortages of natural habitat.
Green roofs also serve as a green wallfiltering pollutants and carbon dioxide out of the air, helping to lower rates of diseases such as asthma. Carbon sequestration[ edit ] An additional environmental benefit of greens roofs is the ability to sequester carbon.
Carbon is the main component of plant matter and is naturally absorbed by plant tissue. The carbon is stored in the plant tissue and the soil substrate through plant litter and root exudates. Variations occurred among the different species of plant used.
The direct carbon sequestration techniques and methods can be measured and accounted for. Green roofs also indirectly reduce CO2 given off by power plants through their ability to insulate buildings. Other[ edit ] Help to insulate a building for sound; the soil helps to block lower frequencies and the plants block higher frequencies  If installed correctly many living roofs can contribute to LEED points Increase agricultural space Green roofs not only retain rainwater, but also moderate the temperature of the water and act as natural filters for any of the water that happens to run off.
By improving the thermal performance of a roof, green roofing allows buildings to better retain their heat during the cooler winter months while reflecting and absorbing solar radiation during the hotter summer months, allowing buildings to remain cooler.
This reduction in energy required to cool a building in the summer is accompanied by a reduction in energy required to heat a building in the winter, thus reducing the energy requirements of the building year-round which allows the building temperature to be controlled at a lower cost.
The regions where these incentives will most likely be found are areas where failing storm water management infrastructure is in place, urban heat island effect has significantly increased the local air temperature, or areas where environmental contaminants in the storm water runoff is of great concern.The intent of this guide is to provide information regarding the state of the art of vegetative roof design and construction.
Vegetative roofs, also known as green roofs, are thin layers of living vegetation installed on top of conventional flat or sloping roofs.
RESEARCH PAPER APPROVAL A HISTORY AND DEFINITION OF GREEN ROOF TECHNOLOGY WITH RECOMMENDATIONS FOR FUTURE RESEARCH By . - We welcome the national polish green roof association, Polskie Stowarzyszenie Dachy Zielone, PSDZ - We welcome our new corporate member urbanscape- KNAUF - Knauf Insulation, d.o.o.
Slovenia, Europe. Flat Roofing systems: The purpose of a flat roof or any roof for that matter is to keep your home or building safe and dry. The roof MUST protect your investment from the elements such as rain, snow, and even the sun’s heat.
However, many flat roofing technologies on the market today have some major, inherent drawbacks that have origins in their design. Unlike most formal academic research projects, this study is published as a web site.
A web site can reflect the qualities found in a traditional research paper (e.g. an introduction, methods, results, parenthetical references, etc.) as well as the qualities of a dynamic document.
Your Next Green Project: Tax Refunds. You’re eco-friendly, you have an IRS tax refund check, and you want to invest it wisely.
Usually when people think of investments, they consider options like stocks and bonds, but when you have a mind for saving the planet, that investment takes on a different meaning: investing in our planet.