Huai Kum Dam, its facilities consist of a rockfill dam with clay core (35.5 metres high and 282 metres long) and a 1.2 MW semi-underground powerhouse which is 4 metres high from the ground and 11 metres down below the ground surface. The dam forms a reservoir with a storage capacity of 22 million cubic metresThe word I-san denotes vastness, which is appropriate considering that the Northeast or Khorat Plateau is bordered to the north and the east by the Mekong River and Laos, and to the south largely by Cambodia. Characterized by rolling terrain and undulating hills, the region has an arid and harsh climate, often suffering from floods and droughts. Yet the major income of the local people is from agriculture, especially rice crops. Agricultural products have dominated the region’s economy