River discharge is defined as the volume of water passing a measuring point or gauging station in a river in a given time. It is measured in cubic metres per second (cumecs). The overall discharge from the drainage basin depends on the relationship between percipitation, evpotranspiration and storage factors and can be summarised as follows:
drainage basin discharge = percipitation - evapotranspiration +- changes in storage
Discharge can be illustrated using hydrographs. These can show annual patterns of flow in reponse to climate. Short term variations in discharge are shown using a flood or storm hydrograph.
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