Bangkok Governor Pol Gen Asawin Kwanmuang said just the removal of garbage from canals in Lat Phrao district and under Pradit Manutham Road required five trucks. 
The area is one kilometre away from a Rama 9 pumping station which drains water from Lat Phrao Canal and Saen Saeb Canal to Chao Phraya River. 
If the garbage blocks the pipes and the tunnels, Bangkok will not be able to drain water during floods in the rainy season, he said. 
The same problem is found in other districts, such as Chatuchak. The governor has asked Bangkok residents to take this issue seriously.

Bangkok governor warns of flood threat from mounting garbage in canals

The amount of garbage in Bangkok’s canals is increasing and is starting to block the sewer system causing floods in many areas, the city chief said.