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floods floods occur by continuous rain for a period of some time.there are some river basins and lowlands in sri lanka which get flooded more often. rivers such as nilwala, kalu, kelani and gin overflow in rainy seasons. because of this the districts like colombo, kalutara, ratnapura, galle and matara get flooded very often. besides trincomalee, polonnaruwa and ampara districts also get flooded during the northeast monsoon. reasons for floods • unexpected heavy rainfall due to change in weather conditions. • clearing the forest cover in highlands leading to soil erosion. • building construction by filling the lowlands. • unauthorized building construction in river basins and mouths of rivers. • walls and other constructions blocking drainage. pollution of drinking water failiure of electricity and communication destruction of agriculture destruction of buildings loss of fertile soil by soil erosion blocking of drainage systems destruction of roads and bridges spread of diseases damages by floods
Last Update: 2020-10-12
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