WEST COLUMBIA, S.C., Oct 5 (Reuters) - Floodwaters inundating South Carolina after unprecedented rainfall have resulted in nine deaths, more than 500 road and bridge closures and hundreds of rescues of people trapped in homes and cars by the rising water, officials said on Monday. Officials expect flooding to continue in half the state.

Governor Nikki Haley warned residents to remain on alert as rain continued to fall in some of the hardest-hit areas, including the state capital of Columbia, which saw its wettest days on record over the weekend.

"This is not over," Haley said at news conference. "There's still a lot of water out there."

More than 2 feet of rain have fallen in the past three days in parts of South Carolina, and moderate to heavy rain persisted on Monday in the state's saturated northeastern corner and southeastern North Carolina, the National Weather Service said.

The flooding closed schools and government offices, stranded motorists and led to dramatic rescues, including a mother and her 15-month-old child who were plucked by a U.S. Coast Guard helicopter from a flooded home in Huger, South Carolina.

Five people drowned when floodwaters swamped their vehicles and four others died in weather-related car crashes, the state Department of Public Safety said. A state transportation department employee was killed after his work truck was overturned and swept away by rushing waters, the agency said.

The severe weather was also blamed for two deaths in North Carolina, officials said.

Nearly 1,000 people have found refuge in shelters around South Carolina, officials said, and water distribution centers were being opened after the downpours left an estimated 40,000 people without drinking water. About 26,000 were without power, officials said.

In Columbia, police and fire officials were going door to door looking for anyone who might still be trapped in houses and to test the stability of buildings damaged by the deluge.

Columbia resident Tommy Rollins, 67, said he went to bed Saturday night after watching a football game and woke up at 4 a.m. Sunday to the sound of rushing water.

"It sounded like someone was taking a shower in every room," he said. "Within 10 minutes, water was bubbling up through the hardwood floors. We had about 30 minutes and then it was 4 feet deep."

Rollins and his wife grabbed a change of clothes and some toiletries and stepped off their porch into chest-deep rushing water before being brought to safety in a neighbor's boat, he said.

Haley and meteorologists said additional flooding concerns remain as rains in the Midlands and Upstate South Carolina flow downstream to the already-swamped area known as the Lowcountry.

That area includes the peninsula of Charleston, which emergency officials have reopened to allow people in and out but where more than 30 streets remained flooded on Monday.

"It's still a pretty desperate situation," National Weather Service forecaster Dave Loewenthal said. "We are going to have river flooding for weeks, if not months." (Additional reporting by Harriet McLeod in Charleston, S.C. and Gene Cherry in Hatteras island, North Carolina; Writing by Colleen Jenkins; Editing by Jonathan Oatis and Grant McCool)

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