The causes of flooding are natural
· heavy rain storm or thunderstorm. The storm caused more consecutive hours. Very heavy rainfall and can not keep up, it flows into the upstream flooding in low areas. Usually occurs during the rainy season or summer
· Heavy rains from a tropical cyclone. When this storm based on a particular time or barely moving. To make the area a torrent consecutive time. The more violent the storm, much like a violent storm or typhoon. When moving out to where it makes the storm winds. Heavy rains and extensive flooding. Also, if the frequency of storms moving into or through occurs continuously. Even in the short term, but was always flooded
· heavy rain in mountain forests. The amount of water on the mountain watersheds or more. And turbulent flow into a severe flat foot. Sudden flooding Called flash floods Occurred after heavy rain in a short period of time. Or before the rain stops falling. Usually occur in small streams. Especially near the headwaters of the watershed. The water level will rise quickly. The province with neighboring valleys, such as Chiang Mai, etc.
· Result from sea militia. In the distance, the sun and moon are in line to make a maximum sea level rise. Sea to boost water levels rise again. Coinciding with the period when the flash flood from the mountains and flow into the river. The water in the river can not flow into the sea. Causing water overflowing its banks and flooding a large area even if there is heavy rain or storms occur during this period. Damage from the floods of this type are very
· The strength of the monsoon. Southwest monsoon moisture from the hurricane that swept the Indian Ocean to the South. From May to October When a force for a period of several days, causing waves. The water level in the sea along the coast will be higher. The heavy rain has caused flooding. Even if a storm occurs in the South China Sea will further strengthen the monsoon has strengthened further. The northeast monsoon blows from China into Thailand. Tackling the east coast of the South. This occasional hurricane strength. The area of high pressure is intensifying in China to make a rather large wave in the Gulf of Thailand. And the sea level is higher than normal. Sometimes heavy rain in the south. Chumphon To cause extensive flooding
, earthquake or volcanic eruption · results. When the earthquake On land and underwater volcanoes or volcanic eruption. The shell of the Earth's surface, some of it has been affected as well. Some of the Earth's surface will rise, some will fall down. Make big waves in the ocean washed ashore. Flooding of islands and coastal cities have. Occur frequently in the Pacific, causing floods from human actions are as follows: · The deforestation. In areas prone to heavy rainfall will increase the maximum flow rate and flow faster. Thus increasing the severity of the damage and the cause of the landslide. It also makes the soil and roots of large washed down the drain in the water. Make shallow water could not drain away. As well as causing the loss of lives and injuries of residents downstream · expanding urban intruded into low lying areas (Flood plain), which is a natural source of water without the water. So when Inundation it would flood an area of low lying areas, the urban extension before · Construction structures obstructing natural causes affecting drainage and causing flooding · Design. inadequate drainage of the road Put the overflow in the city. Damage to large urban areas. Due to drain very slowly · Water management is a bad reason for the flooding, especially around the reservoir or downstream.
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