In the years 1970-1980 groundwater layers in coastal areas is that the balance between fresh water and salt water, but when a factory has been drilling wells and pumping wells added 13 to use. Causes of salt water taken.
In the year 1970 - 1980 groundwater in coastal areas on condition that the balance between fresh and salt water. But once the plant has drilled 13 wells and increased water use in large quantities. The encroachment of saltwater up.
In A.D. 1970 - 1980 layer groundwater coastal area is in the position between fresh และน้ำเค็ม. But when the factory has 13 pond and pond to increase drilling pump used in large quantities. Effect of seawater invasion.