Definition of "hydrograph" [hydrograph]

• A graph of flow past a point in a river versus time. (noun)
• A graph of water table versus time. (noun)

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• "A hydrograph is a graphic depiction of the rate of runoff plotted over a period of time for a particular watershed."
• "Overall, the magnitude and frequency of high flows will decline while low flows will increase, thereby flattening the annual hydrograph."
• "Land storage of snow is important in the formation of the hydrograph in that the distributed nature of the snow across the land “converts” the daily melt into a single peak."