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GM Core / Chapter 2: Building Games / Environment / Natural Disasters

Floods

Source GM Core pg. 96 2.0
Though more gradual floods can damage structures and drown creatures, flash floods are similar to avalanches, except with a liquid mass instead of a solid one. Instead of burying creatures, a flash flood carries creatures and even massive objects away, buffeting the creatures and potentially drowning them. The drowning rules appear on page 437 of Player Core.