Peninsular Drainage originates in the Peninsular Plateau. The rivers of the Peninsular travel through rather shallow valleys. These are valleys that have been graded to some extent. There is little erosional activity in the rivers. These are instances of secondary drainage. These rivers have matured after flowing through one of the world's oldest plateaus. This article will explain to you about Peninsular Drainage which will be helpful in Geography preparation for the UPSC Civil service exam.

Peninsular Drainage

• Peninsula rivers are substantially older than Himalayan rivers.
• Except for a few rivers in the upper peninsula area, the peninsular drainage is mostly Concordant.
• They are non-perennial rivers that have their highest flow during the rainy season.
• The peninsular rivers have reached the mature stage of Fluvial Landforms and are nearly at their base level.
• The rivers are distinguished by wide and shallow valleys.
• Except for a small section where faulting has formed steep sides, the river banks have mild slopes.
• The Western Ghats, which stretch from north to south close to the western shore, create the major water divide in peninsular rivers.
• Due to the low gradient, the velocity of water in rivers and the load-carrying capacity of streams are low.
• Most of the peninsula's major rivers, including the Mahanadi, Godavari, Krishna, and Cauvery, run eastward and discharge into the Bay of Bengal. At their mouths, these rivers form deltas.
• However, the west-flowing rivers Narmada and Tapi, as well as others that originate in the Western Ghats and run into the Arabian Sea, create estuaries rather than deltas.

Peninsular Drainage

Peninsular Drainage - Formation

• The Sahyadri-Aravali axis was formerly the primary water divide.
• According to one theory, the current peninsula represents the residual half of a larger continent.
• The Western Ghats were in the centre of this continent.
• So one drainage flows east into the Bay of Bengal, while the other flows west into the Arabian Sea.
• During the early Tertiary era, the western section of the Peninsula fractured and sank under the Arabian Sea (coinciding with the formation of Himalayas).
• The Peninsular block was susceptible to subsidence in a few areas during the collision with the Indian plate, resulting in a series of rifts (trough, faults).
• These rifts are traversed by the Peninsula's now west-flowing rivers, the Narmada and the Tapi.
• This idea is plausible due to the straight coastline, high western slope of the Western Ghats, and lack of delta formations on the western shore.

Important Peninsular Rivers

• Rivers that flow into the Bay of Bengal include the Mahanadi, Godavari, Krishna, and Cauvery, as well as other minor rivers.
• Rivers that drain into the Arabian Sea: The Narmada, Tapi, and Mahi rivers run west, as do other tiny streams that originate in the Western Ghats and flow into the Arabian Sea.
• Rivers that flow into the Ganges: Tributaries of the Ganga and Yamuna such as the Chambal, Betwa, Ken, Son, and Damodar run in a north-easterly direction.

East Flowing Rivers

Mahanadi

• The Mahanadi basin encompasses the states of Chhattisgarh and Odisha, as well as tiny sections of Jharkhand, Maharashtra, and Madhya Pradesh.
• The Central India hills edge it on the north, the Eastern Ghats on the south and east, and the Maikala range on the west.
• The Mahanadi ("Great River") is 560 kilometres long in all (900 km).
• Its source is located at an elevation of 442 metres in the northern foothills of Dandakaranya in Chhattisgarh's Raipur District.
• The Mahanadi is one of the peninsular rivers' main rivers, second only to the Godavari in terms of water potential and flood-producing capacity.
• The Seonath, Hasdeo, Mand, and Ib are all left bank tributaries.
• The Ong, Tel, and Jonk are right to bank tributaries.

Godavari

• The Godavari, also known as the Dakshin Ganga, is the largest river system in Peninsular India.
• The Godavari basin is over 3 lakh square kilometres in size and spans Maharashtra, Andhra Pradesh, Chhattisgarh, and Odisha, as well as tiny areas of Madhya Pradesh, Karnataka, and the Union territory of Puducherry (Yanam).
• The Satmala hills, the Ajanta range, and the Mahadeo hills border the basin on the north, the Eastern Ghats on the south and east, and the Western Ghats on the west.
• At a height of 1,067 metres, the Godavari River emerges from Trimbakeshwar in Maharashtra's Nashik region, roughly 80 kilometres from the Arabian Sea.
• The Godavari is 1,465 kilometres long from its source to its outflow into the Bay of Bengal.
• Dharna, Penganga, Wainganga, Wardha, Pranahita, Pench, Kanhan, Sabari, Indravati, are Left Bank Tributaries
• Pravara, Mula, Manjra, Peddavagu, Maner, are Right Bank tributaries.

Krishna

• The Krishna River is the Peninsula's second-largest east-flowing river.
• The Krishna Basin encompasses Andhra Pradesh, Maharashtra, and Karnataka and has an area of 2.6 lakh square kilometres.
• The Balaghat range borders it on the north, the Eastern Ghats on the south and east, and the Western Ghats on the west.
• The Krishna River comes from the Western Ghats near Jor village in Maharashtra's Satara district, at a height of 1,337 metres, just north of Mahabaleshwar.
• The river runs 1,400 kilometres from its headwaters to its outlet in the Bay of Bengal.
• Ghatprabha, Malprabha, and Tungabhadra are on the right bank.
• The Bhima, Musi, and Munneru are on the left bank.

Cauvery

• The Kaveri River originates in the Brahmagiri highlands of Karnataka's Kodagu district (1,341m).
• It is 800 kilometres long and drains an area of 81,155 square kilometres.
• The river transports water all year with less variation than the other Peninsular rivers.
• The Cauvery basin includes Tamil Nadu, Karnataka, Kerala, and the Union Territory of Puducherry.
• The Western Ghats surround it on the west, the Eastern Ghats on the east and south, and the mountains that divide it from the Krishna and Pennar basins on the north.
• The Harangi, Hemavati, Shimsha, and Arkavati are important tributaries that join from the left, while the Lakshmana Tirtha, Kabbani, Suvarnavati, Bhavani, Noyil, and Amaravati join from the right.

West Flowing Rivers

Narmada

• The Narmada is the largest west-flowing river in peninsular India.
• The Narmada River flows west through a rift valley formed by the Vindhya and Satpura ranges to the north and south, respectively.
• It rises 1057 metres above sea level from the Maikala range near Amarkantak in Madhya Pradesh.
• The Narmada basin is one lakh square kilometres in size and encompasses the states of Madhya Pradesh, Gujarat, Maharashtra, and Chhattisgarh.
• The Vindhyas surround it on the north, the Maikala range on the east, the Satpuras on the south, and the Arabian Sea on the west.
• From its headwaters in Amarkantak to its estuary in the Gulf of Khambhat, it flows 1,310 kilometres.
• The Barna, Hiran River, Tendoni River, Choral River, Kolar River, Man River, Uri River, Hatni River, and Orsang River are right bank tributaries.
• Buehner River, Banjar River, Sher River, Shakkar River, Dudhi River, Tawa River, Ganjal River, Chhota Tawa River, Kaveri River, Kundi River, Goi River, Karjan River are all left bank tributaries.

Tapi

• The Tapti, often spelt Tapi, is Peninsular India's second-largest west-flowing river and is known as the Narmada's "twin" or "handmaid."
• It begins at a height of 752 metres in Madhya Pradesh's Multai reserve forest.
• Flows for 724 kilometres before emptying into the Arabian Sea via the Gulf of Cambay.
• The Tapti River and its tributaries go across the plains of Vidarbha, Khandesh, and Gujarat, as well as vast swaths of Maharashtra and a small portion of Madhya Pradesh and Gujarat.
• The basin is 65,000 square kilometres in size and encompasses the states of Madhya Pradesh, Maharashtra, and Gujarat.
• The Suki, the Gomai, the Arunavati, and the Aner are all on the right bank.
• The Vaghur, Amravati, Buray, Panjhra, Bori, Girna, Purna, Mona, and Sipna are all on the left bank.

Mahi

• With a total size of 34,842 square kilometres, the Mahi basin encompasses the states of Madhya Pradesh, Rajasthan, and Gujarat.
• The Aravalli hills surround it on the north and north-west, the Malwa Plateau on the east, the Vindhyas on the south, and the Gulf of Khambhat on the west.
• Mahi is a major interstate west-flowing river in India.
• Its origins may be traced back to the northern slopes of the Vindhyas in Madhya Pradesh's Dhar district, at an elevation of 500 metres.
• Mahi has a total length of 583 kilometres. The Gulf of Khambhat is where it enters the Arabian Sea.
• Som is a right bank tributary of Mahi river.
• Anas is a tributary of Mahi on the left bank.
• The Anas River rises near Kalmora on the northern slopes of the Vindhyas in Madhya Pradesh's Jhabua district.
• Panam is a tributary of Mahi on the left bank.

Rivers that flow into the Ganges

• The Ganga river system includes the Chambal, Betwa, Ken, and Son rivers, which originate in the northern region of the Peninsula.
• The Chambal River is a tributary of the Yamuna River in Central and Northern India, and is thus part of the larger Gangetic drainage system.
• The river travels north-northeast through Madhya Pradesh before crossing into Rajasthan and creating the state border between the two states.
• The perennial Chambal originates at Manpur, Indore, on the south slope of the Vindhya Range in Madhya Pradesh, south of Janapav.
• The Betwa River is a tributary of the Yamuna in Central and Northern India.
• It rises in Madhya Pradesh's Vindhya Range and flows northeast through Madhya Pradesh, Orchha, and Uttar Pradesh. Almost half of its route is impassable due to the Malwa Plateau.
• The Ken River is a major river in central India's Bundelkhand region, flowing through the states of Madhya Pradesh and Uttar Pradesh. It is a branch of the Yamuna.
• The Son River is a perennial river in central India. It begins at Amarkantak Hill in the Madhya Pradesh district of Anuppur and flows into the Ganges River near Patna in Bihar.
• The Damodar River flows through the Indian states of Jharkhand and West Bengal.
• The valley, which is rich in mineral resources, is home to large-scale mining and industrial activities. Previously known as the Bengal Sorrow

Significance of Peninsular Drainage

• The Peninsular rivers exclusively acquire water from rainfall, and water flows in these rivers only during the rainy season. As a result, these rivers are either seasonal or non-perennial.
• As a result, these rivers are far less suitable for irrigation.
• The Peninsular rivers exclusively acquire water from rainfall, and water flows in these rivers only during the rainy season.
• The rivers of the Peninsular travel through rather shallow valleys. These are valleys that have been graded to some extent. There is little erosional activity in the rivers.
• Estuaries are formed by several Peninsular rivers, such as the Narmada and the Tapi.
• Deltas are formed by other rivers such as the Mahanadi, Godavari, Krishna, and Cauvery.
• Several minor streams running westward from the Western Ghats join the Arabian Sea without forming a delta.
• The plateau's hard granite surface and non-alluvial composition leave limited room for the creation of meanders. As a result, the rivers of the Peninsular Plateau have very straight courses.

Conclusion

The Peninsular drainage system predates the Himalayan drainage system. The broad, largely graded shallow valleys and the maturity of the rivers attest to this. The Western Ghats, which run close to the western shore, serve as a water divide between the major Peninsular Rivers, which discharge their water into the Bay of Bengal and enter the Arabian Sea as minor rivulets. Except for the Narmada and Tapi, most of the Peninsular Rivers run from west to east.

FAQs

MCQs

1. Which of the following rivers flows into the Arabian Sea?

A) Godavari
B) Krishna
C) Narmada
D) Kaveri

2. What is a primary characteristic of Peninsular rivers?

A) Continuous flow throughout the year
B) Origin from glaciers
C) Seasonal flow
D) Longer length than Himalayan rivers

3. The river Godavari is primarily associated with which of the following?

A) Arabian Sea
B) Bay of Bengal
C) Indus River System
D) Ganges River System

4. Which Peninsular river is known for its cultural significance and agriculture?

A) Kaveri
B) Tapti
C) Mahi
D) Beas

5. How do Peninsular rivers primarily differ in their flow compared to Himalayan rivers?

A) They flow towards the north.
B) They flow primarily east or west directly into the sea.
C) They have a higher volume of water.
D) They are longer in length.

GS Mains Questions and Model Answers

Q1: Discuss the significance of Peninsular drainage in the context of India's geography and economy.

Answer: Peninsular drainage is significant in understanding India's geography as it highlights the unique characteristics of river systems shaped by the region's topography and geology. The rivers flowing in this region are crucial for supporting agricultural activities, as they provide necessary irrigation water for crops, especially during the dry seasons. Economically, Peninsular rivers contribute to energy generation through hydroelectric projects and support various industries by serving as transportation routes. The interconnectedness of these rivers with cultural practices, festivals, and community life underscores their importance in the socio-economic framework of India, fostering regional development and sustainability.

Q2: Evaluate the ecological impacts of Peninsular rivers on regional biodiversity.

Answer: The ecological impacts of Peninsular rivers on regional biodiversity are profound, as these waterways create diverse habitats that support a wide range of flora and fauna. The riverine ecosystems foster unique plant communities that provide shelter and food for numerous species, contributing to overall ecological balance. Furthermore, seasonal floods in these rivers rejuvenate soil fertility and promote agricultural biodiversity. However, the health of these ecosystems is threatened by pollution, dam construction, and encroachment. Sustainable management of Peninsular rivers is essential to preserve biodiversity and maintain the ecological integrity of these vital habitats.

Q3: Analyze the challenges faced by Peninsular river systems in the context of climate change and urbanization.

Answer: Peninsular river systems face significant challenges due to climate change and urbanization. Climate change results in altered precipitation patterns, leading to unpredictable river flows that affect agriculture and water availability. Increased frequency of droughts and floods disrupt local ecosystems and human livelihoods. Urbanization exacerbates these challenges by increasing water demand and contributing to pollution through runoff from urban areas. The construction of infrastructure often alters natural river courses, leading to habitat destruction. To address these challenges, integrated river basin management approaches that incorporate climate resilience and sustainable urban planning are critical for ensuring the longevity and health of Peninsular drainage systems.

Previous Year Questions on Peninsular Drainage

1. UPSC CSE Prelims 2021:

Question: Which of the following rivers is NOT part of the Peninsular drainage system?

A) Godavari
B) Yamuna
C) Krishna
D) Kaveri

Answer: (B)

Explanation: The Yamuna is part of the Northern river system, while Godavari, Krishna, and Kaveri are part of the Peninsular drainage system.

2. UPSC CSE Mains 2019 (GS Paper 1):

Question: "Examine the role of Peninsular rivers in the economic development of India." Discuss with reference to irrigation and hydroelectric power generation.

Answer: Peninsular rivers play a crucial role in the economic development of India, particularly in terms of irrigation and hydroelectric power generation. The rivers provide essential water resources for agriculture, significantly contributing to food security in the region. Through various irrigation projects, these rivers support the cultivation of diverse crops, enhancing agricultural productivity. Furthermore, Peninsular rivers are instrumental in generating hydroelectric power, facilitating energy production that supports industrial growth and rural electrification. As key components of the Indian economy, these rivers not only foster agricultural and industrial development but also support livelihoods and improve the quality of life for communities reliant on their resources.