runoff

Encyclopedia Article

Article

Runoff occurs when water from snowmelt or rain runs along the surface of the earth without being absorbed into the soil. Over time, runoff contributes to erosion. In large amounts, runoff can cause flooding.

Photo Credit: 

 
"Water runoff in the desert, where recent rains lead to flash flood conditions, March 29, 2012" by Richard Allaway is licensed under CC BY.