By: Dr. Sumet Tantivejkul
Freshwater is not only essential for life but the key to agricultural production and food security. Crop production, livestock farming, and food processing all need clean water in sufficient quantities. According to the World Bank, about 70 percent of the total water withdrawn worldwide is used to irrigate crops. But the reality of the supply side does not correspond to these needs. Although an astonishing 71 percent of the earth’s surface is covered with water, only 2.5 percent of that is fresh and one percent of that, accessible.
For a predominantly agricultural country like Thailand, therefore, a high premium has always been placed on freshwater. More significantly, a lot of efforts have been invested in how to manage those resources to ensure that the people and the nation have the means to thrive.
It is little wonder, therefore, why successive Thai monarchs have consistently expressed a keen interest in the issue. In fact, they have been personally and heavily engaged in advancing different methods–given the varied circumstances–of securing this ‘lifeline’ for their people.
Prior to 1857, it was about managing people to suit the water conditions–either moving people away from or closer to water sources. The conclusion of the Bowring Treaty in 1855 led to demands for rice exports that required enough water for irrigation. Therefore, King Mongkut focused on developing canal systems in the Chao Phraya River delta for both irrigation and transportation. King Chulalongkorn, or Rama V, followed suit by upgrading them into more systematic irrigation and drainage systems, which led to the establishment of the Canals Department in 1902. Under King Vajiravudh, the Canals Department became the Barrages Department in 1914, as it expanded its work to construct the first large-scale barrage across the Pasak River in Ayutthaya, named the Rama VI Barrage.









