River discharge is an indication of the volume of water flowing through a river channel. The deviation from a natural river can have degrading impacts on the health of the river. It is measured in cubic metres per second (m³/s). The volume can be affected by human impacts and surrounding vegetation.

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Sources: 

(1) https://www.internetgeography.net/topics/river-discharge/

(2) https://www.usgs.gov/science-explorer-results?es=RIVER+DISCHARGE