Ganga River System: Origin, Tributaries, and Significance for UPSC SSC

Origin and Course

The Ganga, or Ganges, is a trans-boundary river of Asia. It flows through India and Bangladesh. The main headstream of the Ganga is the Bhagirathi. It originates from the Gangotri Glacier at Gaumukh in Uttarakhand. The Alaknanda River is another major headstream. It originates from the Satopanth Glacier above Badrinath. These two rivers meet at Devprayag in Uttarakhand. From this confluence, the river is known as the Ganga. It then flows through the plains of Uttar Pradesh, Bihar, and West Bengal. The total length of the Ganga is approximately 2,525 kilometers. In India, it covers about 2,071 kilometers. The river enters Bangladesh as the Padma. It later joins the Brahmaputra (Jamuna) and Meghna before emptying into the Bay of Bengal.

Major Tributaries

The Ganga River System has numerous important tributaries. These are broadly classified into left-bank and right-bank tributaries. Major left-bank tributaries include the Ramganga, Gomti, Ghaghara, Gandak, Kosi, and Mahananda. The Ghaghara is the largest tributary by volume. The Kosi is known as the 'Sorrow of Bihar' due to its frequent changes in course and devastating floods. Important right-bank tributaries are the Yamuna, Son, and Damodar. The Yamuna is the longest tributary of the Ganga. It originates from the Yamunotri Glacier in Uttarakhand. The Yamuna joins the Ganga at Prayagraj (Allahabad) in Uttar Pradesh. The Son River originates in the Amarkantak Plateau and joins the Ganga near Patna. The Damodar River, once known as the 'Sorrow of Bengal', joins the Hooghly River, a distributary of the Ganga.

Ganga River Basin

The Ganga River Basin is the largest river basin in India. It covers an area of about 861,404 square kilometers. This basin spans across 11 states in India: Uttarakhand, Uttar Pradesh, Madhya Pradesh, Rajasthan, Haryana, Himachal Pradesh, Chhattisgarh, Jharkhand, Bihar, West Bengal, and Delhi. It is one of the most fertile and densely populated regions in the world. The basin supports a vast agricultural economy, primarily through irrigation. The fertile alluvial soil deposited by the Ganga and its tributaries makes this region highly productive for crops like rice, wheat, sugarcane, and pulses. The basin also plays a crucial role in India's industrial development and urban centers.

Ecological and Cultural Significance

The Ganga holds immense ecological and cultural significance. It is considered a sacred river in Hinduism, revered as 'Ganga Ma' (Mother Ganga). Many pilgrimage sites like Haridwar, Rishikesh, Prayagraj, and Varanasi are located along its banks. The river supports a diverse ecosystem, including various species of fish, reptiles like the Gharial, and the critically endangered Gangetic Dolphin. Efforts are underway to conserve the river's biodiversity and reduce pollution. The 'Namami Gange Programme' is a flagship initiative launched by the Indian government in 2014. Its aim is to clean and rejuvenate the Ganga River. This program focuses on wastewater treatment, industrial pollution abatement, riverfront development, and biodiversity conservation.

Important Keywords Explained

Gangotri Glacierplace

A glacier located in the Uttarkashi District of Uttarakhand, India. It is one of the largest glaciers in the Himalayas and is the primary source of the Bhagirathi River, which is a major headstream of the Ganga.

Devprayagplace

A town and a nagar panchayat in Tehri Garhwal district in the state of Uttarakhand, India. It is one of the Panch Prayag (five confluences) of the Alaknanda River where the Alaknanda and Bhagirathi rivers meet to form the Ganga.

Namami Gange Programmescheme

An integrated conservation mission approved by the Union Government in June 2014. It aims at effective abatement of pollution, conservation, and rejuvenation of the National River Ganga. It has a budget outlay of Rs. 20,000 crore.

Gangetic Dolphinconcept

An endangered species of freshwater dolphin found in the Ganga-Brahmaputra-Meghna and Karnaphuli-Sangu river systems. It is India's National Aquatic Animal and is protected under Schedule I of the Wildlife Protection Act, 1972.

Additional Facts & Context

• The Ganga is declared as the National River of India on November 4, 2008.
• The Farakka Barrage in West Bengal diverts water into the Hooghly River.
• The Ganga Sagar Mela is held annually at the confluence of the Ganga and the Bay of Bengal.
• The total drainage area of the Ganga basin is approximately 1,086,000 square kilometers, including parts of Nepal and Bangladesh.
• The average annual flow of the Ganga is about 16,650 cubic meters per second.