Dagvattenhantering : Vid Sunlight i Nyköpings kommun

Sammanfattning: Today stormwater is a growing problem and it is a hot topic for discussions. Due to the urbanization with growing cities and hard surfaces of asphalt and concrete, rainwater flows off the streets and takes contaminants into stormwater wells. From stormwater pipes, water is led to lakes and the sea. The Water Authorities had as a goal that the stormwater would be of satisfactorily ecological and chemical status until year 2015, or in exceptional case a little later. It is then even more important to purify the water, which can be done through vegetation and infiltration in soils and in openwater systems. Openwater systems have better capacity to receive larger flows of water than stormwater pipes. Increased rainwater flows will happen more often with the warmer climate and the increased rainfall that comes with climate change. It is a common problem that urban stormwater pipelines are overloaded and stormwater wells and streets overflow. This report evaluates an industrial area that is planned to be converted into residential areas, for which open-stormwater systems that can be used. Today the stormwater flows from the soil sealed areas from the industrial area down to the recipient without cleaning. An efficient alternative is to use stormwater systems that have vegetation and infiltration for stormwater, so the stormwater can be purified and retarded before it reaches the stormwater pipeline.