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How does the Volga Riverās flow increase between Tver and its mouth?
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Volga River
The Dnieper, Don, and Volga river basins and their drainage network.
The flow of the Volga River increases significantly between Tver and its mouth due to the accumulation of water from approximately 200 tributaries and the river's natural drainage system.12
The average annual rate of river flow rises dramatically along its course:
- At Tver: Approximately 6,400 cubic feet (180 cubic metres) per second.3
- At Yaroslavl: 39,000 cubic feet per second.3
- At Samara: 272,500 cubic feet per second.3
- At the riverās mouth: 284,500 cubic feet per second.3
This increase is driven by major confluences, such as the Oka and the Kama rivers, which contribute substantially to the volume. More than 90 percent of the annual runoff occurs above the confluence of the Kama. Below Volgograd, the river's flow is slightly reduced by evaporation, and it begins to branch into distributaries, such as the Akhtuba and the Buzan, as it approaches the Caspian Sea.13