From the preface: "The literature on river ecology and pollution in India is largely spread over the past fifty years since its beginning and there are no consolidated data on any river systems to assess the changing trends over the past many years in view of the increasing anthropogenic impact on river systems. The Ganga has been studied right from Gangotri, its source to Hooghly by several workers but no trend in their longitudinal distribution of nutrients over a period of time or physico-chemical aspects have been derived. The phytoplankton, zooplankton benthos, bacteria, macrophytes and heavy metal distribution in water, sediment and plants have been studied by many workers in selected sites and are fragmentary.
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