Hydrological monitoring from six Green roofs in Trappes, Paris

Six green roofs were build in 2010 in order to test effects of the green roof composition on the quantity of runoff water. 2 types of plants, 2 types of substrates, 2 different substrate depths and 2 types of drainage layers were tested, with each of the 6 green roof structures differing from an other by only one of these parameters. The monitoring covers a 7-year period and includes continuous measurements of rainfall, meteorological data, substrate soil moisture and outflow.