the study showed that the daytime do was very high; varying between 0.2 and 4.5 mg/l. the saprobic nature of the lake water was confirmed by the p/r ratio which was less than one. eutrophication of the lake was confirmed by further studies which indicated phosphate, nitrogen and chlorophyll levels to be high; with blue green algae (which is toxic and utilises do in the night) called the microcystis was noted from surface to bottom of the lake. this affected the aquatic plants and fish (only a few fish species remained). further studies established the presence of high concentrations of zinc and the metal content in water samples, concentration of zn, cd, cr, pb and cu content was found to be very high in sludge samples with depth of sludge recorded as about .