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Copenhagen: From   sewer to harbour bath

In Copenhagen, Denmark, many years of investments in the   sewerage system have revitalised the harbour. For decades, the discharge of   wastewater from sewers and industrial companies had a major impact on the   water quality in the city harbour. The water was heavily polluted. In 1995,   93 overflow channels fed wastewater into the Copenhagen harbour and the   adjacent coastlines. Since then, the municipality has built rainwater   reservoirs and reservoir conduits, which can store wastewater until there is   space again in the sewage system. This has resulted in the closing of 55   overflow channels. Today, wastewater is only discharged into the harbour   during very heavy rainfall (  

Municipal investments in modernising the sewerage system   and expanding the city's wastewater treatment plants have revitalised the   harbour of Copenhagen. In 2002, the first public harbour bath opened and   today there are four harbour baths. An established on-line warning system   calculates and monitors the water quality in the harbour (   If the water quality is poor, the swimming facilities are immediately closed.

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