Under normal conditions water flow in = water flow out. When abnormal conditions such as previously wet ground, no ground cover vegetation, an impediment to water flow in the valley exist the design conditions are exceeded and water backs up creating flood conditions.
V-shaped valleys by fast flowing rivers, and U-shaped valleys by glacier movement.
As fast as the water is moving.
A Tornado is swirly fast wind, a flood is rising water levels...
Yes, a Flash Flood
Faster than you think
about 60 miles an hour
it depends, if it is a flood then yes if not then no
A cloudburst
You would have to fast for 40 days.
Very fast river stream with huge rains
When rivers flood or over flood they can get in the way, due to the large amount of water stored in the river or due to the fast current it holds.
Why would you want to slow down your Computer? Its only fast for a short time, make the most of it. The only reason you'd need to slow down a computer would be due to bad programming. In which case, sort out the program. If the movement of your cursor / mouse is too fast, you can slow that down. Check in Control Panel.