Green Roof Stormwater Runoff

Therefore green roofs have an important role to play in the urban realm.

Green roof stormwater runoff.

Green roofs aim to help eliminate excess stormwater. They capture water when it rains slowly releasing it through evaporation and plant use. Stormwater runoff that comes from downspouts rushes onto roads picking up copper from brake pads fuel and chemicals. Green roofs have a layer of plant material that absorbs water like a sponge.

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. In urban areas like. Green roofs can significantly reduce the amount of rain water that would otherwise run off an impervious roof surface. Their major drawback is the initial cost.

Due to the volume reduction actual nutrient loadings from.