Khlong (canal) Saen Saep is a canal that has been extended from Khlong Mahanak flows to the eastern side of bangkok, and passes through the following district's area of Vadhana, Suan Luang, Bang Kapi, Bueng Kum, Khanna Yao, Min Buri, Khlong Sam Wa, Nong Chok, Amphoe Bang Nam Priao, and flows into the Bang Pakong River in Chachoengsao Province. The canal is devided into 2 parts; the Khlong Saen Saep Tai (South) that starts from Khlong Mahanak at Wat Borommaniwat up till Hua Mak, Khlong Tan, and Khlong SaenSaep Neua (North) starts from Hua Mak passes through the end reach of Khlong Samsen (Khlong Tan), then passes through Bang Khanak and flows into the Bang Pakong River. There is no evidence of when Khlong Saen Saep (South) was dug but it is estimated that it was made during the time period after Khlong Mahanak was dug during the reign of King Rama I and before the digging of the end reach of Khlong Saen Saep (some areas ity is called Khlong Bang Khanak) which was during the reign of King Rama III in 1837. This was the time that Thailand was at war with Cambodia and Vietnam. During that time sending of provisions and food was slow and not prompt. Therefore King Rama III graciously ordered Phraya Sri Phiphat (That Bunnak) - later was Somdet Chao Phraya Borrommahaphichai Yat, to lead Chinese workers in digging up the khlong. The khlong started from Hua Mak up till Bang Khanak, a total length of 53.519 Kilometres, and had a width of 6 wa and a depth of 4 sork and took altogether 3 years to be completed. The total amount was 96,000 Baht. this khlong has great importance to the economy as well because it connects the Chao Phraya River to the Bang Pakong River and reduces the distance between Prachin Buri, Chachoengsao and Rattanakosin. H.M. King Rama V ordered that the top of the khlong be widened from 6 wa to 9 wa and an extra 6 sork was also added to each side of the khlong.
The Thai measurements in the above piece work out as follows. A Wa is about 2 metres which is fingertip to fingertip with spread arms. A Sork is from the elbow to fingertip, a bit less than half a metre.