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  2. 100-year flood - Wikipedia

    en.wikipedia.org/wiki/100-year_flood

    A 100-year flood is a flood event that has on average a 1 in 100 chance (1% probability) of being equaled or exceeded in any given year. [1] A 100-year flood is also referred to as a 1% flood. [2] For coastal or lake flooding, a 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects. For river systems ...

  3. Rapid City, South Dakota - Wikipedia

    en.wikipedia.org/wiki/Rapid_City,_South_Dakota

    The 1972 flooding has an estimated recurrence interval of 500 years, [17] which means that a flood of this magnitude will occur on average once every 500 years. Every year there is a 0.2% chance (1 in 500) that a similar event will occur. To prevent similar damage, the city has prohibited residential and business construction on its flood plain.

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  5. 2023 Hong Kong rainstorm and floods - Wikipedia

    en.wikipedia.org/wiki/2023_Hong_Kong_rainstorm...

    The Hong Kong Government first described the historic rainfall as "once-in-a-century", [25] but then upgraded the narrative to "once-in-500-years", [28] or a 0.2% chance. [29] It caused uproar from the public as an attempt to deflect the blame, [30] after the authorities were questioned and criticised for the preparedness for such an emergency ...

  6. Lower Rio Grande Valley - Wikipedia

    en.wikipedia.org/wiki/Lower_Rio_Grande_Valley

    The Lower Rio Grande Valley (Spanish: Valle del Río Grande), commonly known as the Rio Grande Valley or locally as the Valley or RGV, is a region spanning the border of Texas and Mexico located in a floodplain of the Rio Grande near its mouth. [1] The region includes the southernmost tip of South Texas and a portion of northern Tamaulipas, Mexico.

  7. Eureka, Missouri - Wikipedia

    en.wikipedia.org/wiki/Eureka,_Missouri

    [11] [12] Scientific researchers determined the flooding was a man-made calamity caused in part by "inaccurate Federal Emergency Management Agency flood frequencies based on the assumption that today's river will behave as it has in the past greatly underestimating our real flood risk and leading to inappropriate development in floodways and ...

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