EE00001972

Thai society in its way of life as well as in the commodities of its trade has been an agricultural one since in the ancient times. As a consequence of centuries of practice, farmers and orchardists have developed localized forms of wisdom and know-how on the cultivation of a variety of crops. A crucial element of this know-how lies in the mastery of irrigation methods used to maximize the productivity of the fields and orchards. The management of the water supplied by the Chaophraya river and the strong seasonal rainfalls was crucial to convert the plentiful sunlight provided by the tropical climate into rich harvests. Among the techniques that the farmers and orchardists developed, the most important way in which the flow of the Chaophraya’s nutrient-rich water to the fields was regulated was by the digging of irrigation ditches. The traditional ditch that was used most widely had its origin in southern China, from where significant numbers of Chinese immigrated to Siam during the Ayutthaya period. This technique can be used both as a way to prepare soil for cultivation and to sustainably regulate water supply to the plants. In the particular case of Bangkok, with its proximity to the sea, it is also a water management process through which the gardener can maintain the balance between fresh water, salt water and brackish water. The gardener will work to regulate the proportions of these three sources of water within their garden by purposefully designing the ditch channels without harming their crops. The wisdom behind the raised garden with a ditch and dike system consists of many small connecting canals dug by the farmers within the turf soil to fertilize the trees. The trees are planted in an elevated plot to prevent flooding during the rainy season. This knowledge of making high-ridge agricultural plots where the soil is dug in lanes is called “Oak Rong” and “Thong Rong”. Besides, the gardens’ water systems were connected to rivers and streams of the public water system.