sentences:  Rangsit Canal was the first irrigation project in Siam (Thailand).King Chulalongkorn ordered its construction in 1890 and assigned Prince Sai Sanitvongse (maternal grandfather of Prince Rangsit) as the project president.The canal starts at the east bank of the Chao Phraya River in Tambon Ban Mai, Mueang Pathum Thani District, Pathum Thani Province.