Reuters reporters in the area said workers had largely managed this so far. But highways to the north of the country are inundated and Rama II Road, the main route to the rubber-producing south, which has not been flooded, is under threat.
Workers are trying to hold the line at the city's Bang Sue canal running from east to west, pushing water into the Chao Phraya river and stopping it from overflowing to the south.
The Chao Phraya river snaking through Bangkok has another phase of high tides from Thursday to Monday but a navy official said water should not reach the record high levels seen at the end of October, when banks overflowed in places.
The flooding began in the north of the country in late July,Military Bastions-Thailand tries to help companies as floods spread, ruining a quarter of the main rice crop now being harvested and overwhelming industrial estates north of Bangkok in October.
Idthipol Patimavirujh, deputy managing director of Daily Foods Co Ltd, the third-biggest milk producer in Thailand, said its three plants at Bang Chan were still working.
The central bank has slashed its economic growth forecast for this year to 2.6 percent from 4.1 percent and may have to cut it further if the flooding spreads right across Bangkok, which accounts for 41 percent of the country's gross domestic product.
"The flooding has dragged down consumer confidence and it will probably fall further if the economy is severely affected and the government can't speed up rebuilding within 3-6 months," said university economist Thanavath Phonvichaisaid.
Now the capital itself is in danger. Residents in a third of its districts, mostly in the north of the densely populated city of 12 million people, have been advised to get out.
But Bangkok Governor Sukhumbhand Paribatra has cancelled a big event on the fast-flowing river and urged people not to float their offerings in flooded areas. That would add to the tonnes of rubbish lying in sodden piles in the streets, he said, and the candles were a fire hazard.
"We can't stop producing. Bang Chan is now the only big kitchen left for Bangkok people," he said.
Suvarnabhumi international airport in the east of Bangkok is functioning normally inside a reinforced dike at least 3 metres (10 ft) high, but the old Don Muang airport in the north of the city, used mainly for internal flights, is closed.
"We still cannot tell the exact damage,Flood Barrier, but it will be higher than 120 billion baht," Deputy Governor Suchada Kirakul told reporters.
The consumer confidence index from the University of the Thai Chamber of Commerce UTTC.L slumped from 72.2 in September to 62.8 in October, its lowest level since the aftermath of the September 2001 attacks on the United States.
The floods would cut foreign tourist arrivals this year by up to 800,000 from the 18 to 19 million expected, at a cost of more than 20 billion baht, Suchada said.
Yongyuth Thongsuk, deputy permanent secretary of the Industry Ministry,Hesco barrier,Military Bastions-Thai confidence at 10-year low; floods hit more firms, said 16 companies had temporarily shut.
Thursday sees the Loy Krathong festival, when Thais like to float offerings of food,Welded Box-Thailand tries to help companies, as floods spread, flowers and candles on rivers and lakes, a symbolic pushing away of bad feelings and bad luck.
In streets south of Don Muang, stagnant water chest-high in places was starting to leave dark stains on buildings in places, a Reuters reporter said. Many locals have refused to evacuate, some getting around on bamboo rafts, others waiting at flooded bus stops for transport provided by the military or aid groups.
The UTTC put the damage at 300-400 billion baht and forecast economic growth of 1.5-2.5 percent this year. If rebuilding did not start quickly and Europe's debt crisis worsened, it may be just 0.5 percent, it said.
"Most operators who have stopped are in the painting and industrial glue businesses,Hesco Barrier," he said. "Major food producers like Nestle, Farmhouse and YumYum are still operating as normal.
Wannarat said 10 more pumps would be brought in on Thursday to add to the 44 the estate already used to push water into a nearby canal. "If all goes as planned, we should still be able to defend this estate," the minister said.
(Additional reporting by Ploy Ten Kate, Martin Petty, Boontiwa Wichakul, Panarat Thepgumpanat, Orathai Sriring and Thin Lei Win; Editing by Kim Coghill)
Water has seeped into parts of Bang Chan industrial estate in the eastern suburbs, home to 93 factories run by local and international companies including Nestle SA (NESN.VX), instant noodle maker YumYum and President Bakery Pcl (PB.BK), which makes buns for McDonald's (MCD.N) and Farmhouse bread.
Industry Minister Wannarat Channukul told Reuters factories had been advised to raise machinery from floor level but the estate was only at flood alert level one, meaning firms could decide for themselves whether they should continue operations.
(Reuters) - Thai consumer confidence fell to a 10-year low in October because of flooding that has taken 533 lives and shut thousands of factories, with another industrial estate threatened on Thursday as water spread in the east of the capital, Bangkok.