The characteristics of flash floods that are not typically associated with regional floods are:
- High flow velocities
- Being influenced by surface conditions
Low flow velocities can accurately be forecast for regional floods, while flash floods are typically characterized by high flow velocities. Additionally, flash floods are often influenced by surface conditions such as urbanization, deforestation, or other changes to the natural landscape. Regional floods, on the other hand, are more likely to be influenced by topography and other long-term factors.