Parameter Tree:
EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > RUNOFF

Definition:
The measurment of the flow of water in a stream, usually expressed in
cubic feet per second; the net effect of storms, accumulation,
transpiration, meltage, seepage, evaporation, and percolation. 


Reference:
Dictionary of Earth Science, 5th ed. 1997. Sybil Parker, ed. in chief.
McGraw-Hill.