Causes of spoiling-Industrial wastewater. -Pesticide and herbicide-The use of the land, a lack of control. -Caused forest fires in the area are the origins of the water.-Waste disposal down the river.
The cause of the sewage - wastewater from industrial plants - pesticides and herbicides - the use of land, lack of control - fire in an area that is dry down the origin of water - throwing garbage into the river.