Pollution concentration here increases abruptly at the advent of the lean
period as the water level of the river recedes a lot at this time but the rate of pollutant released into the river remains identical. At this period, pollution is so acute that hardly any hydro-organisms can tolerate it and eventually, fish of many species are found floating dead in the river water. These dead fishes gradually get rotten and highly add to the further pollution of the river water.