Answer:
The runoff threshold is the amount of effective precipitation of a certain duration that falls on the basin and is sufficient to cause shallow conditions at the outlet of the basin.
Step-by-step explanation:
Flooding is a temporary water cover
land that is not usually covered by water.
* This includes floods that cause:
◦ Rivers
◦ Mountain streams
◦ Torrential watercourses
◦ As well as floods caused by the sea on the coast
areas