Government Spokesman Lt Gen Sansern Kaewkamnerd said the government had instructed the governors of Chainat, Uthai Thani, Singburi, Angthong, Suphan Buri, Lop Buri, and Ayutthaya to warn their people to be on alert as the Chao Phraya could burst the banks.
He said companies, shops, floating restaurants and households along the river should move their valuables upstairs.
He said the governors were also instructed to speed up the flood embankments in their provinces.