Which one of the following statements is not true ?

1. Classification of Indian Drainage Systems (basic)

Welcome to your first step in mastering Indian Geography! To understand the vast network of rivers in India, we first need to look at how geographers classify them. Think of the Indian landmass as a giant tilted tray; the way water flows across it is primarily dictated by its relief features (mountains and plateaus). The most fundamental way we categorize these systems is based on their origin and physiographic characteristics.

We divide Indian rivers into two broad groups: the Himalayan rivers and the Peninsular rivers. Himalayan rivers, like the Indus, Ganga, and Brahmaputra, are perennial, meaning they flow year-round because they are fed by both rainfall and melting snow from the high peaks Contemporary India-I, Geography, Class IX, Drainage, p.17. In contrast, Peninsular rivers are much older and generally seasonal, as their flow depends almost entirely on monsoon rainfall. These rivers have reached a stage of maturity, flowing through broad, shallow valleys compared to the deep, V-shaped gorges of the younger Himalayan rivers India Physical Environment, Geography Class XI, Drainage System, p.23.

Feature	Himalayan Rivers	Peninsular Rivers
Nature of Flow	Perennial (Rain + Snow-melt)	Seasonal (Rainfall only)
Geological Age	Young and active	Older and stable
Valley Shape	Deep gorges, V-shaped	Broad, shallow, graded

Another crucial classification is based on where the rivers end—their discharge of water. About 77% of India’s drainage area (including the Ganga and Brahmaputra) drains into the Bay of Bengal, while the remaining 23% (like the Indus and Narmada) flows into the Arabian Sea India Physical Environment, Geography Class XI, Drainage System, p.19. These two major drainage basins are separated by a "Water Divide" consisting of the Delhi Ridge, the Aravalis, and the Sahyadris (Western Ghats). Understanding this divide is the key to visualizing why a river in central India might flow east instead of west.

Sources: Contemporary India-I, Geography, Class IX, Drainage, p.17; India Physical Environment, Geography Class XI, Drainage System, p.19; India Physical Environment, Geography Class XI, Drainage System, p.23; Geography of India, Majid Husain, The Drainage System of India, p.22

2. West-Flowing Rivers of the Peninsula (intermediate)

While the majority of Peninsular rivers flow eastward into the Bay of Bengal due to the plateau's gentle tilt, the Narmada and Tapi are unique exceptions. These rivers flow westwards because they occupy rift valleys—troughs formed by the downward faulting of the Earth's crust during the same geological upheaval that created the Himalayas. Because they flow through hard-rock mountain ranges, these rivers carry relatively little silt and flow at high velocities, which prevents them from forming deltas; instead, they form estuaries at their mouths.

The Narmada is the largest west-flowing river of the Peninsula. It originates from the Amarkantak Plateau in the Maikal Hills Majid Husain, The Drainage System of India, p.20. As it travels through Madhya Pradesh, it carves spectacular landscapes, most notably the Marble Rocks gorge near Jabalpur and the Dhuandhar Falls NCERT Class IX, Drainage, p.21. Structurally, the Narmada is flanked by the Vindhyan Range to the north and the Satpura Range to the south. Further south, the Tapi (or Tapti) rises in the Satpura ranges of the Betul district. It flows roughly parallel to the Narmada in a more constricted rift valley between the Satpuras and the Ajanta Range Majid Husain, The Drainage System of India, p.20.

River	Origin	Key Characteristics
Narmada	Amarkantak Hills (MP)	Longest west-flowing river; flows between Vindhyas and Satpuras.
Tapi	Satpura Range (Betul, MP)	Flows through a rift valley south of the Narmada; shorter length.
Mahi	Vindhyan Range (MP)	Notable for crossing the Tropic of Cancer twice.
Luni	Aravalli Range (Rajasthan)	The largest river system of Rajasthan; ends in the Rann of Kachchh (endorheic).

Beyond these major systems, several smaller, fast-flowing rivers originate in the Western Ghats and dash toward the Arabian Sea. These include the Sabarmati in Gujarat, and the Periyar and Bharathpuzha in Kerala NCERT Class IX, Drainage, p.21. Because the coastal plain between the Western Ghats and the sea is very narrow, these rivers have very short courses but high discharge during the monsoon.

Sources: Geography of India, Majid Husain, The Drainage System of India, p.20; Contemporary India-I, Geography, Class IX NCERT, Drainage, p.21

3. The Godavari Basin and its Tributaries (intermediate)

The Godavari is often referred to as the Dakshin Ganga (Ganga of the South) or the Vridha Ganga due to its immense size and cultural significance Contemporary India-I, Geography, Class IX . NCERT, Drainage, p.21. It is the largest river system of Peninsular India, stretching approximately 1,465 km from its source to the sea. The river originates from the Trimbak Plateau in the Nasik district of Maharashtra, situated on the eastern slopes of the Western Ghats India Physical Environment, Geography Class XI, Drainage System, p.23. From there, it flows eastward across the Deccan Plateau before discharging into the Bay of Bengal. The Godavari basin is the largest among peninsular rivers, covering roughly 3.13 lakh sq. km. Its catchment area is spread across several states: about 49-50% lies in Maharashtra, with the remainder shared between Madhya Pradesh, Chhattisgarh, Odisha, Telangana, and Andhra Pradesh Contemporary India-I, Geography, Class IX . NCERT, Drainage, p.21. This massive drainage area supports a significant portion of India's agricultural heartland. The tributary system of the Godavari is predominantly characterized by its left-bank tributaries, which are generally larger and more numerous than those on the right.

Bank	Major Tributaries
Left Bank	Purna, Wardha, Penganga, Wainganga, Pranhita (the combined flow of Wardha/Wainganga/Penganga), Indravati, and Sabari.
Right Bank	Manjira (the most significant right-bank tributary), Pravara, and Maner.

One of the most remarkable features of this system is the Pranhita, which carries the largest volume of water to the Godavari, draining the southern slopes of the Satpura range Geography of India, Majid Husain, The Drainage System of India, p.21. Additionally, the Manjira river is noteworthy for hosting the Nizam Sagar reservoir, a critical irrigation source in Telangana.

Sources: Contemporary India-I, Geography, Class IX . NCERT, Drainage, p.21; India Physical Environment, Geography Class XI, Drainage System, p.23; Geography of India, Majid Husain, The Drainage System of India, p.21

4. Major Reservoirs and Dams in South India (intermediate)

In South India, where rivers are primarily rain-fed (peninsular) rather than glacier-fed, reservoirs and dams play a critical role in ensuring a steady supply of water for irrigation, drinking, and hydroelectric power throughout the year. These structures are often the lifeblood of the Deccan Plateau, taming the seasonal fluctuations of the great southern rivers like the Godavari, Krishna, and Kaveri.

The Godavari River, often called the Vriddha Ganga, hosts several vital projects. One of the most significant is the Pochampad Project (also known as Sri Rama Sagar) in Telangana, which serves as a major irrigation source for northern districts Environment and Ecology, Majid Hussain, Distribution of World Natural Resources, p.22. Equally important is the Nizam Sagar reservoir. Built on the Manjra River (a major tributary of the Godavari), it was historically one of the largest engineering feats in the region, designed to provide water to the dry tracts of the Nizam's dominion.

Moving south to the Krishna River system, we find the massive Nagarjuna Sagar Dam, a joint project benefiting both Telangana and Andhra Pradesh Environment and Ecology, Majid Hussain, Distribution of World Natural Resources, p.22. Near Hyderabad, the Osman Sagar (popularly known as Gandipet) was created by damming the Musi River in 1920. It was commissioned by the last Nizam, Osman Ali Khan, primarily to protect the city from floods and provide drinking water Geography of India, Majid Husain, The Drainage System of India, p.30.

The Kaveri River basin is perhaps the most intensely managed in terms of water storage. The Krishna Raja Sagara (KRS) reservoir, located just above Mysore, is essential for the region's agriculture and the famous Brindavan Gardens Geography of India, Majid Husain, The Drainage System of India, p.21. The Kaveri system is also supported by a network of upstream reservoirs on its tributaries, including the Kabini, Hemavati, and Harangi. These reservoirs are often at the center of the long-standing water-sharing disputes between Karnataka and Tamil Nadu Geography of India, Majid Husain, The Drainage System of India, p.38.

River	Major Reservoir/Dam	Key Significance
Manjra (Godavari trib.)	Nizam Sagar	Irrigation in Telangana; built on a principal Godavari branch.
Musi (Krishna trib.)	Osman Sagar	Drinking water for Hyderabad; historic flood control.
Kaveri	Krishna Raja Sagara (KRS)	Primary source for Mysore/Mandya irrigation.
Krishna	Nagarjuna Sagar	One of India's largest multipurpose masonry dams.

Sources: Geography of India, Majid Husain, The Drainage System of India, p.21, 30, 38; Environment and Ecology, Majid Hussain, Distribution of World Natural Resources, p.22

5. Inland Drainage and Seasonal Rivers (exam-level)

In the vast landscape of Indian hydrology, not every river has the strength to reach the ocean. We call this Inland Drainage (or endorheic drainage), where rivers flow into lakes or disappear into the desert sands due to high evaporation and porous soils. This is particularly prominent in the arid regions of Rajasthan and Haryana. Unlike the perennial Himalayan rivers that flow year-round, these are seasonal rivers, coming to life only during the monsoon rains.

The most iconic example is the Luni River, the largest system in Rajasthan west of the Aravallis. It has a fascinating journey: it originates near Ajmer/Pushkar in two distinct branches—the Saraswati and the Sabarmati—which unite at Govindgarh to form the Luni. Interestingly, the river is freshwater in its upper reaches but becomes brackish (salty) after it passes Balotra, eventually losing itself in the marshy Rann of Kutch INDIA PHYSICAL ENVIRONMENT, Geography Class XI, p.24.

Another significant system is the Ghaggar-Hakra. Rising in the Siwalik hills, it is often considered the remnant of the legendary Vedic river, the Saraswati. Geological evidence suggests that tectonic shifts over 1.4 million years ago diverted the waters of the Sutlej away from this channel, leaving it a seasonal stream that now terminates near Hanumangarh Geography of India by Majid Husain, The Drainage System of India, p.10, 26. To help you distinguish these unique systems, look at the table below:

Feature	Luni River	Ghaggar River
Origin	Aravalli Range (near Ajmer)	Siwalik Hills (near Ambala)
Terminal Point	Rann of Kutch (Gujarat)	Thar Desert sands (Hanumangarh)
Special Characteristic	Turns brackish after Balotra	Identified with the ancient Saraswati
Tributaries	Bandi, Sukri, Jawai	Seasonal streams from the Siwaliks

It is important to distinguish these natural drainage systems from man-made interventions. For instance, while the Ghaggar is a natural seasonal river in this region, the Indira Gandhi Canal is an artificial system that brings water from the Sutlej and Beas (at Harike Barrage) to transform the desert, rather than being part of the local inland drainage itself.

Sources: INDIA PHYSICAL ENVIRONMENT, Geography Class XI, Drainage System, p.24; Geography of India by Majid Husain, The Drainage System of India, p.10, 19, 26

6. Indira Gandhi Canal (Nahar) Project (exam-level)

The Indira Gandhi Canal (Nahar) Project, often hailed as the "Lifeline of Rajasthan," is one of the most ambitious and largest irrigation projects in India. It was conceived with the primary objective of transforming the arid, inhospitable stretches of the Thar Desert (Marusthali) into productive agricultural land. The project was the brainchild of hydraulic engineer Kanwar Sain in 1948 and was formally launched on March 31, 1958 INDIA PEOPLE AND ECONOMY, NCERT 2025 ed., Planning and Sustainable Development in Indian Context, p.72.

Crucial to your understanding is the canal's origin. It starts at the Harike Barrage in Punjab. This barrage is strategically located at the confluence of the Sutlej and Beas rivers. By diverting the perennial waters of these Himalayan rivers, the canal carries life-sustaining water hundreds of kilometers south into the dry districts of Rajasthan, such as Ganganagar, Bikaner, and Jaisalmer. It is important to distinguish this from local seasonal rivers; for instance, it does not derive its water from the Ghaggar River, which is a common point of confusion in competitive exams Geography of India, Majid Husain, The Drainage System of India, p.10.

The canal system is divided into two distinct methods of water distribution. Because the terrain of the Thar Desert is not perfectly flat, engineers had to employ different strategies based on the slope of the land:

Feature	Flow System	Lift System
Mechanism	Water moves naturally by gravity.	Water is mechanically lifted to higher elevations.
Location	Mostly on the west (right bank) of the canal.	Mostly on the east (left bank) where land is higher.
Share	Approx. 70% of the command area.	Approx. 30% of the command area.

While the canal has brought immense prosperity and green cover to the desert, it has also faced ecological challenges such as waterlogging and increased soil salinity due to intensive irrigation in a desert ecosystem INDIA PEOPLE AND ECONOMY, NCERT 2025 ed., Planning and Sustainable Development in Indian Context, p.72.

Sources: INDIA PEOPLE AND ECONOMY, NCERT 2025 ed., Planning and Sustainable Development in Indian Context, p.72; Geography of India, Majid Husain, The Drainage System of India, p.10; Geography of India, Majid Husain, Regional Development and Planning, p.24

7. Solving the Original PYQ (exam-level)

This question requires you to synthesize your knowledge of Indian drainage systems with the spatial layout of major irrigation infrastructure. The building blocks here involve distinguishing between perennial Himalayan rivers and ephemeral inland streams. To arrive at the correct answer, you must recall that the Indira Gandhi Canal is a massive project designed to transform the desert landscape of Rajasthan using water from the snow-fed Sutlej and Beas rivers. According to INDIA PEOPLE AND ECONOMY (NCERT 2025 ed.), the canal originates at the Harike Barrage, located at the confluence of these two rivers. Because the Ghaggar is an ephemeral river that often dries up, it cannot support such a vast canal system, making Statement (A) factually incorrect and the correct answer to this "not true" query.

UPSC frequently uses accurate factual pairings as distractors to test your confidence. Statements (B), (C), and (D) are all geographically sound: the Narmada does indeed rise from the Amarkantak region, Nizam Sagar is a well-known reservoir on the Manjra (Manjira) river, and the Penganga is a significant tributary within the Godavari basin system. A common trap is the "not true" phrasing; many students reflexively choose a statement they know is a fact, like the Narmada's origin, instead of searching for the falsehood. By identifying that the Indira Gandhi Canal relies on the Sutlej-Beas system rather than the Ghaggar, as detailed in Indian Economy, Vivek Singh (7th ed.), you can systematically eliminate the true statements and isolate the error.