2011-タイ大規模洪水緊急調査

Site survey and interview at PEO (Provincial Environment Office) Chachoengsao Province

Survey member:

Yamamoto, Honda

Visited Chachoengsao Province on areas connecting to Bangkok to inquire the information at PEO
(Provincial Environment Office) and observed flood situation.

When clicking a marker on a survey site on above map, the pictures of the survey site can be visualized.

(Pumping station: Point A)
Water was drained from canals to Bangpakong River. By installing 6 additional mobile pumps
with 5 already existing pumps capacity can be increased.
(Aquaculture farm: Point B)
Visited fish and shrimp farms which were constructed on Bangpakong River by putting net cages into the river water.
The farm owners informed that huge amounts of water flowing from Bangkok into the river caused the
reduced DO in the river water for longer than 5 days. This led to the death of fish.
(Rice field: Point C)
It is suspected that rice fields which contained a lot of organic matter may also be one of the reasons
causing the reduced DO in flood water.
This area was filled with water for 3 months. Now, water level reduced.
(Watergate: Point D)
Surveyed the water gates on a canal on Bangkok border.
The water gate was closed fully at Khlong Pra Ong Jao, which is a canal draining water from Bangkok
to Bangpakong River, to prevent water flowing to a sub canal ( Khlong Luang Phang). Temporary
weirs were constructed to control water flow. Weirs were also installed on surround canals to slow
down water flow.
(Interviewed PEO)
• High impacted areas are on the northwest closed to Pathumthani and Lam Lukka District.
The water depth in these areas at the present is around 50 cm.
• Low DO levels in flood water led to the death of fish.
• Flood water entered a solid waste treatment area (non-sanitary) which led to the spreading out of low DO water to downstream.
• It is suspected that rice fields which contained a lot of organic matter may also be one of the reasons
causing the reduced DO in flood water.
• None of water treatment in a town zone is damaged by flood. Although water source was contaminated, there was no problem on the produced water.
• Untreated water was distributed to residential outside the town zone. The quality of this consumed water is low.
• A wastewater treatment plant was safe from flood. However, the plant was not operated during the flood period. Flood water entered the sewerage system and this water was drained to a canal by pumps.