hydrograph

[ hahy-druh-graf, -grahf ]
/ ˈhaɪ drəˌgræf, -ˌgrɑf /

noun

a graph of the water level or rate of flow of a body of water as a function of time, showing the seasonal change.

Origin of hydrograph

First recorded in 1890–95; hydro-1 + -graph

British Dictionary definitions for hydrograph

hydrograph
/ (ˈhaɪdrəˌɡrɑːf, -ˌɡræf) /

noun

a graph showing the seasonal variation in the level of a body of water, from which its velocity and discharge can be calculated