During the rainy season, water hyacinth and aquatic weeds in Chao Phraya River and several canals are highly productive and increasing in number comparing to other seasons. Collection of water hyacinth and aquatic weeds and solving this problem in rivers and canals in the area of Bangkok Metropolis so that these plants will not impede drainage is the responsibility of Bangkok Metropolitan Administration (BMA). The BMA organizations, namely Environment Department, Drainage and Sewerage Department, and district offices, have been working together in planning for collection of water hyacinth and aquatic weeds and preservation of Chao Phraya River and canals in localities continuously, including searching for approaches to promote the processing or reuse of water hyacinth for maximum benefit.
The BMA has daily collected solid wastes, water hyacinth and aquatic weeds in accordance with the programme for maintaining the cleanliness of rivers, moats, canals, and water bodies. It aims to facilitate water flow without wastes and dense mats of water hyacinth and aquatic weeds that impede drainage. Some of the collected water hyacinth, other than being disposed at the BMA Refuse Disposal Centre, were mixed with twigs, leaves, and sewage sludge to make organic fertilizer.
Moreover, the BMA has mounted a public awareness campaign among communities located along rivers and canals to recognize environment problem and participate in preservation of Chao Phraya River and canals by not throwing wastes in rivers, moats, canals, and public places. In addition, waste separation based on the principle of “3Rs”, namely Reduce, Reuse and Recycle, will help minimize waste at its source and recyclable waste can generate income for communities. Public relations activities have also been carried out to provide knowledge to communities located along Chao Phraya River and canals on the collection of water hyacinth and the use at its highest benefits such as making of organic fertilizer for the use within communities, etc.