PORT CLINTON, Ohio (AP) -- Floodwaters have receded but telltale water lines remain on buildings in a northern Ohio city that received about 6 inches of rain during six hours.

U.S. Geological Survey hydrologist Greg Kolton tells the Sandusky Register ( http://bit.ly/o2bamJ ) that Sunday's rainfall in Port Clinton is the sort of event that happens once in 500 years.

Flooding forced a small hospital to move three of its six patients and discharge the others. On Monday, a watermark was visible about 10 inches from the ground on Magruder Hospital's glass doors. Spokeswoman Elisabeth Brand says ankle-deep water filled the hospital's lobby on Sunday.

Residents complain that floods occur frequently in Port Clinton, 35 miles east of Toledo. Mayor Debbie Hymore-Tester says projects to improve the storm and sewer systems should provide relief.

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Information from: Sandusky Register, http://www.sanduskyregister.com/cgi-bin/liveique.acgi$schfrontpage?frontpage