The cause.1. wastewater from homes, shops and buildings, the. Toilet and wash 2. the waste water from factories, including wastewater from cooling systems, production systems. Residential buildings and the Shop & cafeteria 3. fertilizers used in agriculture: nitrogen and phosphorus compounds. 4. the surface soil erosion such as the reservoir and erosion of the soil is. 5. raising livestock If animals eat grass, too much ground to cover in front of the Earth is water erosion when it rains. 6. the pesticides and weed removal, most drugs are chemical substances that are poisonous. 7. forest fire If all the source origin is waste coal ash. Sediments of sand, as well as various pollutants flowing into the nanam. 8. the lack of control over land use The two sides or land use around water sources. The problem.
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