Historically, there have been numerous environmental problems in the UK associated with combined sewer overflow (CSO) and other wet weather discharges from urban wastewater systems. There were estimated to be around 25,000 CSOs in England and Wales at the beginning of the 1990s and some 8,000 were believed to be causing pollution problems. A national research programme was undertaken by the water industry between 1980 and 1994 to address the planning needs for the wet...
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