(i) Surface run off/ soil erosion into water depositing silt.
(ii) Dumping of solid waste into water courses.
(iii) Oil leaks from ships/ trucks.
(iv) Industrial effluent when discharged into rivers/ lakes.
(v) Washing away (into rivers and lakes) chemical/ fertilizers/ pesticides/ insecticides.
(vi) Washing/ bathing/ watering animals in rivers/ lakes.
(vii) Disposing of raw sewage into rivers/ lakes.
maurice.mutuku answered the question on July 3, 2017 at 07:10
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