River of Arunachal Pradesh
Drainage system of Arunachal Pradesh
Drainage forms a major physiographic element of a region. It refers to the pattern of rivers and streams which constitutes the surface run-off. Arunachal Pradesh has proved a natural home for the dense drainage system. A large number of long rivers with their numerous tributaries drain the region. Major rivers and their tributaries are interposed between defined mountain ridge.
In general major rivers form dendritic pattern. Brahmaputra River System forms the larger part of drainage system of Arunachal Pradesh. Major rivers have so much of dominant physiographic stay that most of the districts of Arunachal Pradesh have been named after the major rivers draining the particular area. Major River Systems are-
The Dibang River System
The Dibang River System drains the territorial confines of Dibang district. The drainage pattern of the Dibang River system resembles perfectly with elendric pattern. The almost North-South flowing Dibang receives a lot of tributaries from west and east.
West– Yangyapchu, Andra, Elan and Ahi
East- Dri, Tangan, Ithun etc.
Siang River of Arunachal Pradesh
River siang constitutes the part of river Brahmaputra. It provides entry of Tsanpo – the source flow line of Brahmaputra in Tibet having its origin at Tamchok Khambab chorten in the chemayungdung glacier. It enters the northern border of Arunachal Pradesh near namcha barwa mountain peak (7755 metres). It flows southward through the full length spa of old siang District.
Shimang, Yamne, Siku, Sibia, Ringong, Sigang, Nidyang and Siyum are the major tributaries of the river Siang. The river siang drains out ultimately into th river Brahmaputra in Assam. The river diahang, as the river siang is known by other name has a capacity of- flow discharge of about 200000 cubic metres of water.
The Subansiri River of Arunachal Pradesh
The identity of subansiri district is associated with the River Subansiri. The dendritic nature of drainage pattern is not so densely developed in case of the Subansiri river system as in case of Dihang and the Dibang. River Subansiri receives tributaries both from the north and south of the main Himalayan Range.
Tsari, chu, Yu Me Chu, Siken, Sinyum, Syee are important tributaries. The main river separates the Abor Hills from the Miri Hills. It is supposed to have a long course in the Himalayan and flows through a series of gorges and rapids. The Siyum forms the major course of the River Subansiri which joined by another important tributary the Karela in its lower reaches.
The Kameng River of Arunachal Pradesh
The Kameng River system drains the land of Kameng district in the western part of Arunachal Pradesh. Flowing from the north it is joined by the river bicham at Palazi where the main river descends down south ward after a westerly flow and follows again a course of westward flow to enter the plain of Assam with south-eastward bend to drain out into the Brahmaputra.
It discharge some 25900ncubic metres of water to the Brahmaputra. Bicham has major tributaries in Dakhri Bru Bishumchu and Diyang Nala. Yenga river is also an important tributary of Bicham.
The Naming River of Arunachal Pradesh
In the extreme northwest part of Arunachal Pradesh the river Tawang flows from northeast to southwest direction. In its lower reaches an another tributary Nyamjangchu joins it from the north. This river as also the Kameng has not developed so dense dendritic pattern of drainage as in case of River Siang and the Dibang in the eastern section of the Eastern Himalayan part of Arunachal Pradesh.
The Lohit River of Arunachal Pradesh
The River Lohit differs in its flow direction and location. This forms the part of the physiographic character of the Purvanchal. The river Lohit drains the area between Assam and Burma. It has a water discharge capacity of about 60,000 cubic metres. It joins the noa Dihing flowing through the northern section of tirap district and taking a northward turn to enter Lohit district near Jaipur in Assam plain to follow the main course of the Brahmaputra. Namdapha joins noa dihing from north. Namphuk River in Tirap district flows almost parallel to Noa Dihing or Diyum. Hetzu, Digaru, Tidding are important tributaries of the Lohit. In its middle and upper reaches the river Lohit is respectively known as Tellu and Krawnaan.
The Tirap River of Arunachal Pradesh
Having its origin in southwest border section of Tirap district the River Tirap flows northeast to meet Burhi Dihing in the Assam plain. Parallel to Tirap flows the course of the Namchik River.
The Tisa River of Arunachal Pradesh
In the western part of Tirap district the River Tisa forms a distinct river system. It originates in southern part and flows directly northward to join Disan river in the Assam plain. It has Tishing and Tawai as its major tributaries at western flanks.