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Storm water overflows

Sewerage systems in cities are not always able to drain all storm water, and after periods of heavy rain, bathing water quality can decrease significantly due to overflows. The number of such pollution events has increased in recent years. Sewage overflows across Europe are increasingly being managed using new measures such as the construction of storage tanks and the creation of nature-based retention basins that serve also as urban green areas. Modelling and warning systems can be put in place to advice bathers against bathing during short-term pollution events.