Negative impacts on the environment, such as floods severity, have been significantly intensified due to urban population growth, soil imperviousness, the lack of a Stormwater Management Plan, and the overuse of channelization. Therefore, the need of a paradigm shift in the traditional conception of stormwater drainage originated the concept of Low Impact Development (LID), which has as a principle to manage stormwater as close to its source as possible by applying techniques that allow restoring natural functions lost due to urbanization process. In this context, the use of green roofs is a widely accepted technique because of its contribution to the quali-quantitative stormwater control, besides other benefits. This paper presents the results of a long-term study about the efficiency of a green roof on the quantitative stormwater control. It was possible to reduce, on average, 62% of runoff, promoting a runoff delay and a reduction on peak flow, allowing, therefore, the desired control. However, its efficiency is highly dependent on climatic and precedent soil moisture conditions.
Bamboo; Green roof; Control; Stormwater; Low Impact Development
