At least 18 people have been killed in Taiwan's worst flooding for a quarter of a century.
Hundreds of houses have been destroyed
Another nine people are missing, feared dead, after torrential rain hit the island in the wake of Typhoon Mindulle.
Streets flooded in central and southern parts of the island, submerging cars and trucks, and causing mudslides which destroyed hundreds of homes.
Typhoon Mindulle struck the Philippines last week, sparking widescale flooding which left at least 20 people dead.
The typhoon was the strongest to hit the Philippines this year, but it weakened slightly by the time it reached Taiwan.
Nevertheless, it still managed to cause crop damage on the island estimated at $70m.
Villages cut off
More than 10,000 people have been stranded in mountainous areas without fresh water and electricity.
The military has dispatched helicopters to reach villagers and tourists trapped in the affected regions, but the rescue teams have been hampered by the weather.
"We are running out of drinking water and milk for children," a villager told a local television station.
"We hope the skies clear up later so the helicopters can land."
Among the buildings affected by the floods were five hydroelectric power plants.
About 200 workers have been trapped in their dormitories at the plants over the weekend.
Weather forecasters say the heavy rain is likely to continue in the coming days.