BANGKOK - Almost one in 10 Japanese manufacturers with operations in Thailand plans to relocate out of the kingdom after last year's devastating floods, a survey showed Wednesday.

Electronics makers were particularly hard hit, with more than half directly affected by the disaster, according to the poll of 1,345 companies by the Japanese Chamber of Commerce Bangkok (JCCB), in which 366 responded.

"The electronics sector suffered more than other industries," said Setsuo Iuchi, chairman of the organisation's economic research committee, adding that such companies were now trying to spread their risk.

Eight per cent of all Japanese manufacturers in Thailand plan to relocate out of the country, while 85 per cent will resume their business in the same place. Others expect to move within the kingdom.

The months-long floods last year took a heavy toll on Thailand's industrial heartland north of Bangkok, with many factories forced to close temporarily.

Japanese auto giant Honda has suspended operations since early October at its factory in Ayutthaya, where it was forced to destroy more than 1,000 cars that were submerged by the muddy waters.

The survey showed 72 per cent of manufacturers expected to resume their operations between December 2011 and March 2012, while 21 per cent will restart in April-May this year, and six per cent in June or later.

"Those companies that are resuming late have to wait for new machinery imported from Japan, and some are still waiting to see the Thai government's flood prevention plan," Iuchi said.

The JCCB has urged the Thai government to speed up the implementation of a flood control plan.