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The Pollution Control Department tested water quality from Sunday to Tuesday and found that the Lop Buri River in Lop Buri's Tha Wung district had a dissolvedoxygen concentration of 0.4 milligrams per litre (mg/l), much lower than the minimum for thirdclass water sources of 4 mg/l, PCD chief Supat Wangwongwatana said

The sample collected from Muang district had 1.2 mg/l, while Ban Mi district's Chai NatPasak irrigation waterway had 1.1 mg/l, as it drained standing floodwater from 100,000 rai of paddy fields.

The samples collected from Prachin Buri also had low levels of dissolved oxygen ranging from 2.23.0mg/l, when these secondclass water sources should have at least 6mg/l, he said.

Samples collected from the Chao Phya River in Ayutthaya showed that the Bang Ban watermeasuring station had 5.7mg/l when it should reach at least 6mg/l.

The water quality in the Lop Buri and Prachin Buri rivers was returning to normal, Supat said.

 The Irrigation Department would urgently release floodwater into nearby reservoirs and use good water to dilute dirty water in some spots, he said.

The discharge of floodwater would not cause problems on the lower Chao Phraya River passing through Bangkok because there were many canals to spread the surge.

In Chachoengsao, floodwaters in Sanam Chai Khet district have started to subside but runoff from higher ground has submerged two tambons on the way to Thalad Canal.

In Ubon Ratchathani, the Mul River was rising due to nonstop rainfall, threatening riverside residents in Muang and Warin Chamrap districts.