Pwd Green Roof

A green roof is effective in reducing the volume and velocity of stormwater runoff from roofs by temporarily storing stormwater slowing excess stormwater released into the combined sewer system and promoting evapotranspiration.

Pwd green roof. A green roof can be installed on many types of roofs from small slanting roofs to large commercial flat roofs. Since one green acre is as valuable as another water department workers have been installing green stormwater infrastructure projects in a range of public areas focusing on neighborhoods with little or no green space. It should have good consistent drainage and aeration with a structure that enables it to hold water. Applicants should email pwd planreview phila gov to notify pwd that they intend to apply for the green roof density bonus.

A green roof also known as a rooftop garden or a living roof is a vegetative layer grown on a rooftop. There are two general categories of green roofs. This is a resource for planners and designers seeking guidance on the process for creating green stormwater infrastructure gsi for philadelphia water. The designer is referred to section 3 2 4 for information on using smps in series.

But they also must create a growing area and potentially provide support irrigation and root protection barriers while staying as light as possible. Gsi projects installed and maintained by pwd as part of our gsi program. An extensive green roof contains up to six inches of soil is lightweight accommodates shallow rooted plant species and provides baseline stormwater insulation and ecological benefits. The popularity of green roofs has increased in the united states due to their many benefits while pretty green roofs serve a much greater purpose than simple beautification.

Green roofs can be combined with other stormwater management practices smps in series to meet the philadelphia water department pwd stormwater regulations stormwater regulations. Green roof growing medium is composed of mineral aggregates and only a small amount of organic material. Two types of green roof exist. Green roofs can be added to existing roofs and can cover all or part of the roof.

It should also be light weight resistant to decomposition and compression and physically and chemically stable. It is also recommended that the applicants notify the philadelphia city planning commission regarding its review of the zoning permit application. Unlike traditional black tar roofs green roofs reduce energy costs by absorbing heat instead of attracting it and. A construction certification package for the green roof.