floodwater

This term specifically describes the body of water resulting from a flood event, emphasizing the substance itself rather than the event of flooding. It is typically used in technical, journalistic, or emergency management contexts to describe the physical presence of water in places it does not belong, such as streets or living rooms.

As a mass noun, it is treated as uncountable. You would not refer to "floodwaters" in a countable sense (e.g., "three floodwaters"), though the plural form "floodwaters" is frequently used as a collective noun to evoke a sense of vastness, power, or a wide geographical area affected by a disaster.