1. flooded because of heavy rain. 2. characteristics and components of the watershed area. 2.1 the shape of watershed 2.2 climate of the watershed area. 2.3 the type of soil. Conditions the plants cover the areas and degradation of watershed areas. 3. sea water from reserves 4. changes in environmental conditions. 4.1 the enlargement of the community and destroy the existing drainage system, naturally. 4.2 the land subsides.
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