Filtering and retention structures

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Courtesy of IWA Publishing

Filtering and retention structures serve the purification and intermediate storage of rainwater discharge from tilled areas. The untreated rainwater from a seperate sewer system can have a major share in water body pollution. Thereby, especially the concentration of filtratable material is problematic. Additionally, rainwater floats intermittently into the water body. Measures for purification and intermediate storage of rainwater discharge are often found in front of discharge points into water bodies to reduce both substantial and also hydraulic strain of a water body. There are both technical and near to nature solutions. Regarding flood control, water storage can lead to a lower dipping flood wave keeping the total volume of discharge equal. Following measures are described more detailed on separate sites:

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