BANG PA-IN, Thailand — In the neck-deep floodwaters of an industrial zone here, workers are using Jet Skis and wooden skiffs to transport stacks of computer components out of waterlogged factories.

Three weeks after monsoon run-off swamped more than 1,000 factories across central Thailand, the brown, corrosive floodwaters have only slightly receded, leaving the world’s largest computer makers without a reliable forecast about when crucial parts will be available once again.

Consumers worldwide could see increases of at least 10 percent in the price of external hard drives because of the flooding, according to Fang Zhang, an analyst at IHS iSuppli, a market research company. The effect will be less noticeable for laptops and desktop computers, he estimated, because demand has been weakened by the current global economic malaise.

The image of Thailand as a land of temples, beaches and smiles has over the years been reinforced by the country’s tourism advertising campaigns. But the flooding here, the worst in at least five decades, has revealed to the world the scale of Thailand’s industrialization and the extent to which two global industries, computers and cars, rely on components made here.