In the reign of King Mongkutklao or King Rama VI, His Majesty graciously gathered the activities of the Canals Department and established Krom Thod Nam or the Barrages Department instead in B.E.2457 (A.D.1914) and appointed Mr. R.C.R.Wilson, an English engineer, to be the Director General of the Barrages Department. At that time, the Barrages Department has begun the development of irrigation works to be in conformity with the technical principle for cultivation purpose and implemented the South Pasak Irrigation Project by constructing a large scale barrage across the Pasak River, the first barrage of Thailand constructed in accordance with modern civil engineering principles and named it Rama VI Barrage, located at Tha Luang Sub-district, Tha Rua District, Ayutthaya Province.