Northern Dvina River
Length: 744 km
The basin area: 357 000 km2
Northern Dvina river is the major river of the North zone of the European Russia and the White sea basin; compiled from Sabinsk island's connection with the city of Velikiy Ustyug, rivers Sukhona and Yug. Northern Dvina river irrigates of Vologda and Arkhangelsk region, and, after walking about 673 km, flows from the Southeast to the Dvina Bay of the White sea, in 40 kilometers below the city of Arkhangelsk. First Northern Dvina river flows North, with a difference on the East by Ustyug's gorge for 63 kilometers, up to the confluence with the Vychegda river which is a tributary of the Northern Dvina, while the mass of water, channel width and things far exceeds the upper Northern Dvina. From the mouth of the Vychegda river Northern Dvina takes the direction to the North-West, which saves throughout the rest of their flow. River region of the Northern Dvina river stretches from 320 to 340 000 000 square kilometers. Northern Dvina river is very calm during which receives considerable speed only on the tunes. The river flows through a wide valley, on both sides fenced by high banks, consisting partly of lime, as part of the layers of sand. One or the other of the two banks, alternating between them, come to the river significant slope. To the mouth of the Vychegda river Northern Dvina little change its original course, which is almost without any changes every spring to care of high water.
Length - 744 km, the length of the river Sukhona - 1300 km length with Vychegda river - 1803 km. According to the state water register the length of the water way from the river Kubena to North Dvina is 1 683 km area of the basin - 357 thousand km2. Malaya Severnaya Dvina is formed by the confluence of the Sukhona and the Yug (the town of Velikiy Ustyug in Vologda region). Then flows northward to Arkhangelsk region. Near the town of Kotlas Small Northern Dvina river merges with the Vychegda (it should be noted that the Vychegda merging carries more water than the Malaya Severnaya Dvina), then turn North-West, and then gradually to the North. Almost in the very North merges with the Pinega river. The Delta of the Northern Dvina (the area of the Delta, about 900 km2) starts from Novodvinsk. Near Arkhangelsk and Severodvinsk flows into the Dvina Bay of the White sea. Below the mouth of the Northern Dvina river Pinega is divided into streams with numerous Islands, the width of the valley rises to 18 km. The Arkhangelsk river again going in one direction, but below the city forms the Delta square of 900 km2, consisting of several sleeves.
Hydrology the river.
The river is filled with water, mainly due to snow. The average consumption of water at the confluence of the Sukhona and Yug 770 m3/s at the mouth 3490 m3/S. the Largest scale fluctuations between the mouths of the rivers Vaga and Pinega to 14 m Freezes at the end of October-beginning of November, it is opened from early April to early may. The break-up of rapid and frequent congestion.
Shipping along the Northern Dvina begins immediately upon its opening in a few days, come to Arkhangelsk barks «from above» and soon arrive commercial and fishing vessels from the sea. Continues shipping up to half of October, ships due to the shallow waters are sometimes river voyage not until July or even August. In September the water comes. The length of the rivers of the basin S. Dvina equal 7693 km, of which 658 km driftwood ways exclusively for timber in rafts, 1223 km for Laden ships and 4294 km navigable at both sides.