Division of Responsibilities and Areas Between State Agencies in Dredging of Canals and Removal of Weeds  

- The Royal Irrigation Department is responsible for water distribution areas under the department's supervision. 

- The Bangkok Metropolitan Authority (BMA) is responsible for areas in the BMA area as indicated on the map. 

- The Supreme Commands of the Army, Navy, and Air-Force are responsible for the eastern Samut Prakarn area. 

- The Office of Accelerated Rural Development is responsible for the area along the Tha Chin River, east of Bangkok. 

- The Public Works Department is responsible for the Pra Padaeng and Samutchedi districts in Samut Prakarn Province. 

- The State Railway of Thailand and the Department of Highways are responsible for dredging and disposing of water hyacinth weeds around various structures, in canals and around infrastructures such as drainage pipes, bridges, etc., under their supervision.