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ammonia biological birds Brighton cadmium Carbon Tetrachloride channel chemical chlorine Chromium compounds contaminants copper Dangerous Substances Directive dissolved oxygen downstream Eastham Eastham Locks eels effects effluent Ellesmere Port environment Environmental Quality Standards EQSs fauna Fiddler's Ferry fish flounder flow freshwater habitat Hale Head heavy metals Hexachlorobenzene high water Howley Weir important improvements in water increase industrial discharges Inner Estuary inter-tidal invertebrates lead levels Liverpool Bay load low water major Manchester Ship Canal Mersey Basin Campaign Mersey Estuary monitoring neap tide North Sea North West Water nutrients Pentachlorophenol pollutants discharged pollution control Pollution Prevention population Prince's Pier Quality Objectives ragworm reduced reductions in input Regulations rerreatian River Mersey Rivers Authority Runcorn salinity salt marsh samples sewage treatment shown in Figure significant Sluices species spring tides Stanlow tidal cycle Upper Estuary upstream Warrington waste water quality Whilst Widnes wildfowl Wirral zinc