The compilation of these Drainage Notes makes students exam preparation simpler and organised.
Drainage System of India
Where do all the rivers emerge from? And where do they end? Have you ever thought of that? All the rivers in India form a river system which is known as the Drainage system of India. Let’s learn about the different rivers and river systems in India that together form the drainage system of India.
The term drainage describes the river system of an area. Do you know that all the rivers of an area meet at one point and drain into a larger water body such as a lake or a sea or an ocean? Yes. a drainage system is an area that is drained by a single river. A mountain or upland separates two drainage basins. Such a separation is known as the water divide.
Drainage System of India
The drainage system of India, that is, the rivers, is divided into two major groups:
- the Himalayan rivers
- the Peninsular rivers
Let’s study the drainage system of India in detail.
The Himalayan Rivers
The three main Himalayan rivers are the Indus, the Ganga, and the Brahmaputra. These rivers are long and are joined by many tributaries. A river along with its tributaries forms a river system. Let’s study each river and its tributaries.
The Indus Valley System
The river Tibet starts in Tibet, near lake Mansarovar. It flows west and enters India in the Ladakh district of Jammu and Kashmir. the tributaries that join Indus in this region are the Zaskar, the Nubra, the Shyok, and the Hunza. Then the river flows through Baltistan and Gilgit and emerges from the mountains at Attock. In Pakistan, the Satluj, the Beas, the Ravi, the Chenab, and the Jhelum join the Indus near Mithankot.
Beyond this, the river flows southwards and reaches the Arabian Sea, which is east of Karachi. The Indus plain has a gentle slope. Indus is one of the world’s longest rivers with a total length of 2900 km. Most of the Indus basin is located in Jammu and Kashmir, Himachal Pradesh, and Punjab. the rest of the river is located in Pakistan.
The Ganga River System
‘Bhagirathi’ which is the headwaters of the Ganga is fed by the Gangotri Glacier. It is joined by the Alaknanda at Devaprayag in Uttarakhand. The Ganga emerges at Haridwar from the mountains onto the plane. Many major rivers join the Ganga which includes the Yamuna, the Ghaghara, the Gandak, and the Kosi. the river Yamuna emerges from the Yamunotri Glacier in the Himalayas. It meets the Ganga at Allahabad at the right bank.
The Ghaghara, the Gandak and the Kosi rise in the Nepal Himalaya. The tributaries which come from the peninsular uplands include the Chambal, the Betwa, and the Son. These rivers do not carry much water in them.The Ganga flows eastwards till Farakka in West Bengal. This is the northernmost point of the Ganga delta. From here, the river bifurcates. The length of the Ganga is over 2500 km.
The Brahmaputra River System
The Brahmaputra rises in Tibet east of Mansarovar lake very close to the sources of the Indus and Satluj. It is slightly longer than the Indus. Its course mostly lies outside India. The Brahmaputra then flows eastwards parallel to the Himalayas. It enters India in Arunachal Pradesh through a gorge. It is joined by the Dibang, the Lohit, and many other tributaries in Assam. Unlike other northern rivers, Brahmaputra forms huge deposits of silt on its bed causing the river bed to rise.
The Peninsular Rivers
The Western Ghats, which runs from north to south close to the western coast, form the main water divide in Peninsular India. The major rivers of the Peninsula which flow into the Bay of Bengal include the Mahanadi, the Godavari, the Krishna, and the Kaveri. The Narmada and the Tapi are the only long rivers which flow west and make estuaries.
The Tapi Basin
The Tapi rises in the Satpura ranges, in the Betul district of Madhya Pradesh. Its basin covers parts of Madhya Pradesh, Gujarat, and Maharashtra. The main west rivers flowing west are Sabarmati, Mahi, Bharathpuzha, and Periyar.
The Narmada Basin
The Narmada river rises in the Amarkantak hills in Madhya Pradesh. It flows towards the west in a rift valley. On its way to the sea, it forms many picturesque locations like the ‘Marble rocks’ and the ‘Dhuadhar falls’.The tributaries of the Narmada are very short. This basin covers parts of Madhya Pradesh and Gujarat.
The Godavari Basin
The Godavari is the largest Peninsular river. It rises from the slopes of the Western Ghats in the Nasik district of Maharashtra. The length of the river Godavari is about 1500 km. It drains into the Bay of Bengal. It also has the largest drainage basin. The basin covers parts of Maharashtra, Madhya Pradesh, Odisha, and Andhra Pradesh. The tributaries that join the Godavari are the Purna, the Wardha, the Pranhita, the Manjra, the Wainganga and the Penganga.
The Mahanadi Basin
The Mahanadi rises in the highlands of Chhattisgarh. It reaches the Bay of Bengal after flowing through Odisha. The length of the Mahanadi river is 860 km. It covers parts of Maharashtra, Chhatisgarh, Jharkhand, and Odisha.
The Krishna Basin
The Krishna river rises from a spring near Mahabaleshwar and flows for 1400 km. It reaches the Bay of Bengal. The tributaries of the Krishna river are the Tungabhadra, the Koyana, the Ghatprabha, the Musi, and the Bhima. Its drainage system covers parts of Maharashtra, Karnataka, and Andhra Pradesh.
The Kaveri Basin
The Kaveri rises in the Brahmagri range of the Western Ghats and reaches the Bay of Bengal in the south of Cuddalore, in Tamil Nadu. The total length of the Kaveri river is 760 km. The main tributaries of the Kaveri river are Amravati, Bhavani, Hemavati, and Kabini. It covers parts of Karnataka, Kerala, and Tamil Nadu.
India has many lakes. One of the most lakes is the Dal lake of Kashmir which attracts thousands of tourists. Most lakes are perennial and some contain water only during the rainy season. Most of the freshwater lakes are in the Himalayan region. The Wular lake in Jammu and Kashmir is the largest freshwater lake in India.
Other freshwater lakes include the Dal lake, Bhimtal, Nainital, Loktak, and Barapani. There are also some artificial lakes such as Guru Gobind Sagar, which are formed by the damming of water.
Role of Rivers in Economy
Rivers are of great importance to humans. We use them for irrigation, navigation, hydropower generation, etc. In a country like India, where agriculture is an important occupation, rivers are of significant importance. Thus, the drainage system of India is a basic natural resource of water.
Humans have been modifying everything according to their needs for ages. All the growing needs and demand for water have affected the quality of water in rivers. More and more water is being removed from the rivers reducing their volume. on the other hand, a lot of sewage and waste material is added to water in rivers which affects the quality of water.
We should realize the importance of rivers and the drainage system of India and take action to conserve water in rivers. Therefore, it is crucial for us to preserve the drainage system of India.
In which of the following states is the Wular lake located?
c) Uttar Pradesh
d) Jammu and Kashmir
d) Jammu and Kashmir.
The Walur lake is in Jammu and Kashmir. It is the largest freshwater lake in India.