River water quality of the River Cherwell: An agricultural clay-dominated catchment in the upper Thames Basin, southeastern England

摘要: The water quality of the River Cherwell and a tributary it, Ray, are described in terms point diffuse sources pollution, for this rural area upper Thames Basin. Point pollution dominate at critical ecological low flow periods high biological activity. Although surface geology is predominantly clay, base partly supplied from springs underlying carbonate-bearing strata, which influences particularly with regards to calcium alkalinity. hydrogeochemistry river outlined overall importance urban even what would normally be considered catchments stressed relation European Unions Water Framework Directive. Issues phosphorus stripping sewage treatment works also considered: such on has reduced concentrations by about factor two, but insufficient needs