Where is brahmaputra river on the map

The weather is occasionally changed by the passage of western disturbances across the region, light rainfall occurs in January and February along the hills, increasing towards North-east Assam.

Thunder storms are rare in December and January and occur only on one or two days in February, these may occasionally be accompanied by a dust or hail storm. From March onwards, the hot weather starts and continues up to the last week of May. In this season the basin is under the sway of three air streams a deep north-westerly current from Uttar Pradesh and Bihar, a shallow southerly stream from the head of the Bay of Bengal over the Orissa and Bengal coasts, and a shallower current of North easterly to easterly winds from the Brahmaputra valley blowing over the plains of North Bengal and Bihar.

With the interactions between these air streams, this is a season when marked instability develops in the atmosphere and severe thunderstorms occur extensively, sometimes preceded by dust-raising squalls.

Rainfall increases both in amount and frequency as the season advances, being generally associated with after noon or evening thunderstorms and squalls. They are generally more concentrated in Upper Assam. Hail storms occur on one to three days in the season, especially in the Assam hills. The monsoon sets in by the last week of May or in early June, being usually ushered in by a depression in the Bay of Bengal. Subsequently, a series of such depressions, forming at the head of the Bay and moving inland, give spells of continuous and moderate to heavy rain generally over the region.

The monsoon withdraws in the last week of September or the first week of October. July and August are the rainiest months. Rain is most frequent and heavy on the southern slopes of the khasi hills in the north-east corner of Assam, and in Northern Bengal. Much of the rainfall in June and September is associated with thunder-clouds, while thundery weather is less frequent in July and August. After the withdrawal of the monsoon winds, light unsteady winds are experienced by the middle of October.

Occasionally, in October, cyclonic storms from the Bay cross the Bengal coast bringing clouds and rain with them. Almost all the rain in this season is associated with thunder. During the post-winter months, the north-east monsoon finds its way into the Brahmaputra valley through a saddle in the high Himalayas, at their eastern end. The Assam range of hills gradually rise in height eastward from m in the Garo hills to about 3, m in the Naga hills.

The low clouds brought in by the south-west monsoon get interrupted on the southern face of the Khasi and Jaintia hills by a 1, m high ridge and cause extremely heavy rainfall along the Cherrapunji-Mawphlang-Pynursla belt. This is generally of the order of 11, mm per annum, the highest in the world. The clouds that pass over this 1, m ridge along this belt, precipitate in the Brahmaputra valley, their intensity increasing towards the foothills of the Himalayas.

The rainfall in the Brahmaputra valley ranges from 2, mm in Kamrup to about 4, mm in Tirap Division of the Arunachal. The Lanka area in Nagaon district on the north of the Khasi and Jaintia hillis lies in the rain shadow region and in consequence, the annual rainfall there is only about 1, mm. The rainfall in the Tista valley varies from 1, mm in West Dinajpur district to 3, mm in Jalpaiguri district.

During the winter season in January, the mean temperature over the catchment varies from The higher elevations in the Himalayan ranges experience lower temperatures.

During the summer season in April, the mean temperature in the lower part of the catchment varies from In the rainy season, in the month of July, the mean temperature varies from Towards the end of the monsoon season, in the month of October, the mean temperature over the basin varies from The Arunachal region experiences temperatures lower than Prior to independence, little thought was given towards water resources development in Brahmaputra valley.

For the low density of population in the sub-basin, the abundant rainfall and fertile soil could produce sufficient food grains to meet the requirements by traditional methods. Most of the projects taken up and completed in the plan periods were medium and minor schemes. Dhansiri, Champamati and Teesta barrage are three major projects in the sub-basins.

The Brahmaputra sub-basin has abundant hydropower potential. As per the latest assessment the hydropower potential of the basin is MW.. These schemes together amount for only Therefore, a large chunk of the hydropower potential of the basin remains to be tapped. Guwahati, Shillong and Siliguri are the important urban centres. The sub-basin is rich in petroleum and coal.

Digboi in Assam was the only source of petroleum in India until about Petroleum products, jute, drugs and pharmaceuticals are other industries in the sub-basin. However, further studies proved that the actual source is the Angsi Glacier, which is situated on the northern edge of the Himalayas.

While flowing within the boundaries of Tibet, which is an autonomous region of China, the river is referred to as the Yarlung Tsangpo. After originating in the Angsi Glacier, the Brahmaputra follows an easterly path for nearly miles, and is bound by the Himalayas to the south and the Gangdese Range to the north.

In Tibet, the Brahmaputra charts a course through an extremely deep gorge which is often referred to as the Grand Canyon in the local language. From Tibet, the Brahmaputra then flows into India. In India, the Brahmaputra first flows through the northern region of the state of Arunachal Pradesh. The river flows within the state for about 22 miles before it is joined by two of its major tributaries, the Lohit River and the Dibang River.

After joining the Lohit River, it is known as the Brahmaputra. The river crosses through territory of the indigenous Bodo tribe, who refer to the river as Burlung-Buthur. After flowing through Arunachal Pradesh, the river enters the Indian state of Assam, where its width increases to nearly 12 miles in some areas.

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