During the rainy season, the Bangkok area usually faces with flood due to its geographical features of being a lowland area and basin and many constructions that obstruct the flow of water.

Therefore, Bangkok Metropolitan Administration (BMA) has prevented flood problem using integrated approaches by preparing flood prevention action plan and canal dredging operation plan, dredging drains and sewer pipes, and maintaining all machineries and mechanical systems. The BMA has also coordinated with various related departments and developed supporting systems to help accelerate drainage into rivers, moats, and canals as quickly as possible to reduce flood problems and alleviate people’s hardship. These systems include construction of drainage tunnels to improve drainage efficiency by receiving flood water from road surfaces and canals in the areas into drainage tunnel system and drain to the Chao Phraya River. Currently, the Drainage and Sewerage Department has implemented and completed three drainage tunnels construction projects and they have already been opened for service, as follows:

1) Saen Saep Canal and Lat Phrao Canal Drainage Tunnel – The 5-meter diameter tunnel receives water from Saen Saep Canal and Lat Phrao Canal to help drain flood water in the areas of Lat Phrao District, Wang Thonglang District, Bang Kapi District, Huai Khwang District, Bueng Kum District, Saphan Sung District, and neighboring areas covering an area of approximately 50 square kilometers.

2) Bueng Makkasan Swamp Drainage Tunnel – The tunnel with a diameter of 4.60 meters helps drain water in the entire area of Vadhana District, Pathum Wan District, Ratchathewi District, Phaya Thai District, Huai Khwang District, Din Daeng District, and neighboring areas covering an area of approximately 26 square kilometers.

3) Drainage tunnel under Bang Sue Canal – The tunnel, starting from Lat Phrao Canal to the Chao Phraya River, has a diameter of 5 meters, helps drain water from the areas of Huai Khwang District, Din Daeng District, Phaya Thai District, Chatuchak District, Lat Phrao District, Wang Thonglang District, Bang Sue District and Dusit District, covering an area of ​​over 56 square kilometers. Moreover, there is also Bueng Nong Bon Swamp Drainage Tunnel which is now under construction and is almost completed.

In addition, the BMA has built water banks to help collect excess water from the main sewers and drainage system during the rain. Currently, there are 2 water banks, one is under Bang Khen Police Station and another one is in Soi Sutthi Phon 2. Sewers and drainpipes have been constructed using Pipe Jacking method along public roads to speed up the draining of water into moats and canals and in flood risk areas to dry faster. In addition, more than 190 water pumping stations and 329 pumping wells are being built to help increase efficiency in pushing water into the tunnels to accelerate the drainage into the Chao Phraya River. The BMA has also acquired areas for building monkey-cheeks to retain water during the rainy season. Currently, there are more than 31 locations in Bangkok.

The BMA has also organized officers to clean out sewers and drainpipes which is more than 3,348 km long, dredged ditches, moats, and canals, collected garbage, and sucked up sediments that left in the tunnels to open the water channels and facilitate water flow regularly throughout the year. Moreover, garbage clamps are installed to increase the efficiency of garbage collection, instead of using human labor, to prevent floating garbage from being trapped at water filter and obstruct the drainage channel. The condition of all pumps was checked to be ready for use. The BEST staffs are arranged at the pumping stations and drainage tunnels for 24 hours so that the team can immediately access to the areas for 24 hours.

However, people can follow weather alerts and rain situation in the areas of Bangkok Metropolis and its vicinity via website, Facebook and Twitter of the BMA Drainage and Sewerage Department and Public Relations Office including applications “BMA Connect”. If flood problem is found, please report to the Flood Prevention System Control Center at telephone number 0 2248 5115 for 24 hours.


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