Extending east west for about 725 km with an average width of 80 km,
the Brahmapurta valley is an important physiographic unit of the state.
The valley covers 72% of the state's total area and is drained by 32
major north and south bank tributaries. The valley as a whole gently
slopes down from north-east to south-west with an average slope of 13
cm per km in the lonf profile of the river Brahmaputra. In the upper
reach ,the slope is 17cm (near Dibrugarh),while it is 10cm per km near
Guwahati. Numerous small and big tributaries from north and south join
the Brahmaputra. The important among them are Gai, Subansiri, Bharali,
Puthimari, Pagladia, Manas, Ai, and Sonkosh from the north and Buri
Dihing , Dhansiri, Kopili, Digaru, Kulsi and Krishna from the south.
The Brahmaputra valley has 4 notable micro-physiographic divisionsin
its east-west spatial span : the northern foothills, the southern
foothills, the middle plains and the floodplains incliding the char
areas. The northern foothills with elevations ranging between 150-550m
are mainly composed of tertyiary sandstones. The southern margin of
this zone is a high plain favourable for the growth of tall grases and
trees, which provides ideal sites for reserved forests and wildlife
sanctuaries. During the recent period, however,this zone in many
places, has been degraded badly by the ever-expanding human
interferences.Almost same is in the case with the foothills bordering
the south bank plain in the districts of Tinsukia, Dibrugarh, Sibsagar,
Jorhat and Golaghat.
The Kailash-origin of the river Brahmaputra!
Picture of River Brahmaputra taken from satellite!
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