hydrograph: Meaning and Definition of

hy•dro•graph

Pronunciation: (hī'dru-graf", -gräf"), [key]
— n.
  1. a graph of the water level or rate of flow of a body of water as a function of time, showing the seasonal change.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.