2.) caused by human actions such as deforestation. Community development to destroy cars, flood prevention and groundwater pumping.-Deforestation Make rainfall cannot be absorbed by the roots, stems and leaves. For the area, the runoff of surface water is faster because there are no trees, psmti chon anam. Which makes the maximum flow rate of the water. In addition, there are also chances of rain washing away the soil to remove pages that will cause turbidity of water and sediment that comes with more water.-Community development Urban areas often have a surface area of water ingress. Make it rain water flowing into the Canal, drainage and more rural areas where rain can ooze into the subway, including the development of a community that has not been the primary major performance drain worsening. By obstructing the way water flow. Prevents it from draining out of the area, causing flooding conditions. In addition, in most areas, the community would have to build a House on the Canal, which is the construction of the House, taken a public pool. Make the size of the narrow river and sewage disposal into the rivers make the rivers shallow.
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