Run Off

When the rain is heavy and the land cannot absorb the water.

Links

http://www.answers.com/topic/surface-runoff

http://www.shodor.org/master/environmental/water/runoff/RunoffApplication.html

http://ga.water.usgs.gov/edu/runoff.html

http://stream2.cma.gov.cn/pub/comet/HydrologyFlooding/RunoffProcessesInternationalEdition/comet/hydro/basic_int/runoff/print.htm