Właściwości retencyjne "zielonych dachów"

Green roof's retention capability of rainwater are the basic function of green roofs. Water is stored in the substrate and then taken up by the 57 plants from where it is returned to the atmosphere through transpiration and evaporation. A green roof will have a noticeable impact on the air humidity, air quality and reflected heat in the surrounding neighbourhood. In conjunction with other green installations, green roofs can play a role in altering the climate of the city as a whole. In the 1970's scientists began to research the green roof's retention capability of rainwater with various effects. At the close of 2001, a binding regulation for the measurement of a discharge coefficient/ runoff index was developed, which is portrayed in the new edition of the FLL - Guidelines "Planning, Installation, and Maintenance of Green Roofs" of early 2002.