What's the difference between a flood and a flash flood?
Flash floods are distinguished from a regular flood by the length of time it takes for the flood to occur. Under six hours, the flood is referred to as a flash flood. Some can occur within minutes. Areas will not always be able receive a warning that these floods are coming and people can be caught off-guard.
Source: NOAA and NWS
Poll
MegaCities: Top 10 Most At-Risk Cities
1. | Tokyo | 68 |
2. | Los Angeles | 25 |
3. | Manila | 18 |
4. | Bandung | 17 |
5. | Santiago | 16 |
6. | Nagoya | 9.4 |
7. | Osaka | 9.4 |
8. | Jakarta | 9 |
9. | Lima | 8 |
10. | Chengdu | 7.5 |