excessive nutrients in a lake or other body of water, usually caused by runoff of nutrients (animal waste, fertilizers, sewage) from the land, which causes a dense growth of plant life; the decomposition of the plants depletes the supply of oxygen, leading to the death of animal life; "he argued that the controlling factor in eutrophication is not nitrate but phosphate"
(ecology) of a lake or other body of water rich in nutrients and subject to eutrophication
… The one is a preservation of reservoir water which has been caused to eutrophicate and the other is a purification of the inflow water from small branch rivers which has been polluted heavily in exceed of the envilonmental standard. …