Koppu weakened into a tropical storm and moved into the South China Sea by today morning, but its huge rain band ensured more downpours while flooding swept within 40 kilometres (25 miles) of Manila, the capital.
Rice farmer Jeffrey de la Torre, 32, woke up to water flowing through his shanty for a second day, dangerously close to the top of a dining table used by the family of five as an emergency bed.
"I just hope our rice stock is enough. Our farm was wiped out so, for now I'm out of work."
De la Torre spoke to AFP as he waded across a flooded road to beg a friend for fish to feed his wife and children, aged between three and eight.
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Koppu, the second strongest storm to hit the Philippines this year, forced 70,000 people from their homes and impacted about 230,000 others across the main island of Luzon, the government's disaster management agency said.
Floods as high as rooftops covered some of the nation's most important rice and corn farming regions in the flat plains north of Manila that are either side of three giant mountain ranges.
While the water had subsided today in many areas closer to the ranges, the flooding moved downstream.
With the heavy rain continuing over the Cordillera ranges in the north and dams almost at capacity, more water was expected to flow down throughout the week.
In the large coastal town of Lingayen, 170 kilometres north of Manila, residents were taken by surprise last night after the Agno river broke its bank and led to neck-deep floods.
"We thought the danger had already passed," municipal disaster officer Sharon Sison told AFP, referring to Koppu slashing through the town of 100,000 people late on Saturday.