Pwd Green Roof

This is a resource for planners and designers seeking guidance on the process for creating green stormwater infrastructure gsi for philadelphia water.

Pwd green roof.

Applicants should email pwd planreview phila gov to notify pwd that they intend to apply for the green roof density bonus. 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. The designer is referred to section 3 2 4 for information on using smps in series. It is also recommended that the applicants notify the philadelphia city planning commission regarding its review of the zoning permit application.

The layers of a green roof must like any roof accommodate drainage and protect the building from the elements with a waterproof membrane. But they also must create a growing area and potentially provide support irrigation and root protection barriers while staying as light as possible. 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. The site is intended for use by providers of professional planning and engineering services contracted by philadelphia.

Gsi projects installed and maintained by pwd as part of our gsi program. A green roof can be installed on many types of roofs from small slanting roofs to large commercial flat roofs. A green roof also known as a rooftop garden or a living roof is a vegetative layer grown on a rooftop. 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 roofs can be added to existing roofs and can cover all or part of the roof. 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. It should have good consistent drainage and aeration with a structure that enables it to hold water. It should also be light weight resistant to decomposition and compression and physically and chemically stable.

The philadelphia water department has taken the lead in the project through its green city clean waters initiative. A construction certification package for the green roof. Two types of green roof exist. There are two general categories of green roofs.