Green Roof Stormwater Runoff

In urban areas like.

Green roof stormwater runoff.

Therefore green roofs have an important role to play in the urban realm. Due to the volume reduction actual nutrient loadings from. Green roofs aim to help eliminate excess stormwater. Their major drawback is the initial cost.

A typical extensive green roof of 3 5 inches depth will reduce the volume of runoff by about 55 in central pennsylvania and attenuate the peak runoff rates to the level of the pre development land use. Stormwater runoff that comes from downspouts rushes onto roads picking up copper from brake pads fuel and chemicals. They capture water when it rains slowly releasing it through evaporation and plant use. Green roof runoff does contain concentrations of some nutrients and other parameters but values are in line with other planted systems.

Green roofs have a layer of plant material that absorbs water like a sponge.