Documentation on water quality based on seasonal distribution pattern of physic-chemical characteristics of the three major rivers flowing in Imphal, Manipur were carried out during July, 2011 to June, 2012. Three main seasons were classified based on the ombothermicinformation for ten years weather data of Imphal. Significant seasonal variations of the different parameters were observed and the study has a great valuein terms of river ecosystem as well as water quality in different seasons.

An investigation on enteropathogens in the water of Imphal river at five different sites within greater Imphal area of Manipur was carried out as a part of water quality documentation at monthly intervals for one year. Densities of enteropathogens were found to be high during rainy season and low during summer and winter seasons. The degrees of survival for the different bacteria were influenced by various environmental factors as well as anthropogenic activities.