An instrument that records river flow, water level, or other characteristics of rivers over time; a recording gauge for fluvial measurement.
From fluvio- (river) + -graph (writing or recording instrument, from Greek graphein to write). The -graph suffix appears in instruments like seismograph and thermograph.
A fluviograph is like a river's diary—hydrologists use these instruments to read the long-term memory of rivers, revealing patterns of flooding, drought, and climate change written in water levels.
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