When Helene marched north through Georgia on Thursday and Friday, it caused flash flooding and power outages across the state, including an already soaked Atlanta. The city reported 21 water rescues in one highly affected area, and about 100,000 households overall were without electricity on Friday, with flash flood emergency alerts for the region in effect. Mayor Andre Dickens declared a state of emergency.

In Buckhead and other northern Atlanta neighborhoods, a swollen Peachtree Creek, a 7.5-mile waterway that flows into the Chattahoochee River, helped fuel the flooding in some apartments and houses that forced some residents to flee, wading through the streets.

Murky-brown water rushed through the Peachtree Park Apartments subdivision in a low-lying pocket of Buckhead, pooling on the street and seeping into residences. The two-story apartment complex sits in one of the most affluent neighborhoods in Atlanta that once made national headlines for its effort to secede from the city. (It eventually did not.)

Marcus Benson, who lives in the neighborhood, drifted off to sleep on Thursday after putting his infant son to bed. Mr. Benson said he was lulled by “the beautiful sounds of the water and rain” tapping against his windows and roof. But a harsh rap at his front door jolted him awake; his neighbor had come to warn him that Peachtree Creek was spilling over into their community — and fast.

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By around 10 p.m., the flooding had risen to about chest level, Mr. Benson said, and the rain wasn’t letting up. So Mr. Benson, 40, hoisted his 3-month-old son above his head, and he and his wife began to ford the deluge.

He didn’t have time to consider the danger, even as the water crept up toward his chin.

“You don’t think about it,” he explained in an interview on Friday. “You’re so cold; you’re fueled by adrenaline.” Temporarily relocated to a neighbor’s apartment, Mr. Benson said he was just happy they were all safe and dry.

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