Green roofs have a layer of plant material that absorbs water like a sponge.
Green roof stormwater runoff.
Green roof runoff does contain concentrations of some nutrients and other parameters but values are in line with other planted systems.
Therefore green roofs have an important role to play in the urban realm.
Green roofs aim to help eliminate excess stormwater.
Due to the volume reduction actual nutrient loadings from.
Their major drawback is the initial cost.
They capture water when it rains slowly releasing it through evaporation and plant use.
Green roofs can significantly reduce the amount of rain water that would otherwise run off an impervious roof surface.
Green roofs are very effective stormwater bmps.
Green roofs can help to reduce both storm water volume rate of run off entering the drainage system.