Mountain river in the Carpathians. Mountain rivers are rivers flowing predominantly in the mountains, in a narrow, deep valley with steep banks and a rocky channel, cluttered with fragments of rocks. For mountain rivers, large slopes and speeds of flow, small depths, frequent rapids and waterfalls are characteristic, eroded processes prevail. The slope of mountain rivers is 60–80 m / km in the upper reaches and 5–10 m / km in the lower reaches. The flow velocity is from 1 to 4.5 m / s and more.

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