Irrigation works began seriously in the reign of King Rama V A dredging the canal and the canal up the new area in the plains of central, operated by the private company is digging canals and Marianas Trench guard received Royal Assent. When the 2431 start digging canals were performed according to 25 years concession project consists of the construction system of the canal. In the plain of the eastern side of the Chao Phraya River, Pathum Thani Province, called the Rangsit canal by big lines connects the Chao Phraya River. Direct to the Nakhon Nayok, along with creating a floodgate for control of catchment เพื่อการเพาะปลูก and creating a door to ship travel water transportation throughout the year and in the reign of the baht majesty พระปกเกล้าเจ้าอยู่หัว. The initiative that functions of Department of irrigate. Not working only irrigation alone. Work at the Department of irrigation practices exist at the moment the dig canals, irrigation, including sending น้ำตาม various canal and water pumping for cultivation. He graciously pleased to change the name from the Department of irrigation is established on 20 March 2470.
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