It is the improvement of irrigation system in the Lower Eastern Chao Phraya River, Phra Nakhon Si Ayutthaya Province. The project involves the improvement/dredging of 18 canals, with a total distance of 524.3 km, and the improvement/construction of 20 control structures. The project site is located on the Lower Eastern Chao Phraya River areas covering six provinces, including Phra Nakhon Si Ayutthaya, Saraburi, Pathum Thani, Chachoengsao, Bangkok, and Samut Prakan.