Historical clue formulations

• Barrage — 2024-04-02
• Cataclysm in the lore of many world cultures — 2023-01-24
• Event lasting 40 days and nights in the Bible — 2022-10-24
• Overwhelm — 2021-08-15
• Inundate — 2021-02-23
• There was a great one in Genesis — 2014-02-23
• Fill, and then some — 2012-01-01
• Result of a burst dike — 2011-09-12
• Reason for 21-Across — 2009-12-17
• Overrun — 2005-03-17
• Johnstown disaster — 2002-04-17
• Result of a bank failure? — 1997-03-17