Intensity of Friday’s downpour in Penang a once-in-40-year occurrence, says state exco - Nation | The Star Online: "The high rainfall of 137mm, recorded during Friday’s storm, is a once-in-40-year occurrence, said State Local Government, Traffic Management and Flood Mitigation Committee chairman Chow Kon Yeow.
“The downpour last night was estimated to be a 40-year average recurrence interval (ARI) which means that it will occur once every 40 years or at a 2.5% chance of occurrence in any given year,” he told a press conference at the Town Hall here, Saturday."
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