4. the Land Fund survey found that areas in Bangkok. Groundwater is due to take up underground water utilization in the consumer over the water to flow back into the substitution. At a rate of approximately 5-10 cm per year, especially the area of Phra khanong bang Kapi-Huai khwang, and so the ground is the fossa, which undermine pan drain from this cause is seen as increasing influence, with the support of sea water and the others mentioned above and.Due to the area's groundwater, which is still continuing even though the Government tried to stop the underground water, Bangkok would continue until the water levels of groundwater to sustain above the level of the minimum surface almost 3 m in estimated 2543 (2000) will cause damaging increases in Bangkok, respectively.5. the State of being destroyed at drainage is naturally due to the planned use of land without strong and carefully. The drainage system in the city from the natural Canal to the pipe system is not sufficient to drain, and also has problems with obstruction or road block in such a way that the direction of flow of the water. With the size of the drainage channel is not enough. These causes will result, causing extreme flooding in Bangkok in General when torrent.
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