Which one of the following dams is constructed across Krishna River?

1. Classification of Indian Drainage Systems (basic)

To understand India's water resources, we first look at the master plan designed by nature. The drainage systems of India are primarily classified based on their origin and the broad relief features of the subcontinent. We divide them into two major groups: the Himalayan Rivers and the Peninsular Rivers CONTEMPORARY INDIA-I, Drainage, p.17. This classification is not just about geography; it is about the 'character' of the water flow. Himalayan rivers (like the Indus, Ganga, and Brahmaputra) are perennial, meaning they have water throughout the year because they are fed by both melting snow from lofty mountains and monsoonal rainfall. In contrast, Peninsular rivers are generally seasonal or ephemeral, as their flow is almost entirely dependent on rainfall Geography of India, The Drainage System of India, p.22. Geologically, the Peninsular system is much older, evidenced by its broad, shallow valleys and 'mature' river profiles, whereas Himalayan rivers are youthful and still actively carving deep gorges INDIA PHYSICAL ENVIRONMENT, Drainage System, p.23. A vital concept in this classification is the Water Divide. In the Peninsula, the Western Ghats acts as the primary divide. Most major rivers like the Godavari, Krishna, and Kaveri flow eastwards into the Bay of Bengal, while the Narmada and Tapi are notable exceptions that flow westwards into the Arabian Sea CONTEMPORARY INDIA-I, Drainage, p.21.

Feature	Himalayan Rivers	Peninsular Rivers
Nature of Flow	Perennial (Snow + Rain)	Seasonal (Rain only)
Geological Age	Young and Youthful	Old and Mature
Drainage Basin	Very Large	Comparatively Smaller

Sources: CONTEMPORARY INDIA-I, Drainage, p.17; Geography of India, The Drainage System of India, p.22; INDIA PHYSICAL ENVIRONMENT, Drainage System, p.23; CONTEMPORARY INDIA-I, Drainage, p.21

2. Major East-Flowing Rivers of the Peninsula (basic)

When we look at the map of Peninsular India, you'll notice a distinct eastward tilt of the Deccan Plateau. This geological slant means that the majority of our major peninsular rivers—the Mahanadi, Godavari, Krishna, and Kaveri—flow toward the Bay of Bengal. Unlike the perennial Himalayan rivers, these are seasonal, relying primarily on the monsoon rains. Because they flow over a gentler gradient as they approach the coast, they carry significant sediment and form extensive, fertile deltas at their mouths CONTEMPORARY INDIA-I, Drainage, p.21.

The Godavari is the undisputed giant here, often called the 'Dakshin Ganga'. It is the largest peninsular river system, rising from the Trimbak Plateau near Nasik in Maharashtra and stretching nearly 1,500 km to the sea Geography of India, The Drainage System of India, p.21. Its massive basin covers roughly 10% of India's total geographical area. While it has several large tributaries like the Pranhita (a combination of the Wardha and Wainganga) and the Penganga, the Manjira is particularly noteworthy as its only major right-bank tributary Geography of India, The Drainage System of India, p.21.

Moving south, we find the Krishna River, the second-largest east-flowing peninsular river. It originates near Mahabaleshwar in the Western Ghats. The Krishna is famous for its unique bird-foot delta (similar to the Mississippi) and is fed by vital tributaries like the Tungabhadra, Bhima, and Koyna Geography of India, The Drainage System of India, p.21. Further south lies the Kaveri (or Cauvery), which rises in the Brahmagiri range (Taal Kaveri) of Karnataka. Unlike other peninsular rivers, the Kaveri maintains a more constant flow throughout the year because its upper catchment receives rainfall from the Summer Monsoon, while its lower catchment gets rain from the Winter Monsoon Geography of India, The Drainage System of India, p.20.

River	Source Region	Key Tributaries
Mahanadi	Dandakaranya Plateau (Chhattisgarh)	Seonath, Hasdeo, Tel, Ib
Godavari	Nasik (Maharashtra)	Pranhita, Manjira, Indravati
Krishna	Mahabaleshwar (Maharashtra)	Bhima, Tungabhadra, Ghataprabha
Kaveri	Taal Kaveri (Karnataka)	Kabani, Bhavani, Amaravati

Sources: CONTEMPORARY INDIA-I, Drainage, p.21; Geography of India, The Drainage System of India, p.21; Geography of India, The Drainage System of India, p.20; Geography of India, The Drainage System of India, p.4

3. Objectives of Multipurpose River Valley Projects (intermediate)

When we look at India's development journey post-independence, Multipurpose River Valley Projects stand out as the backbone of our agrarian and industrial growth. As the name suggests, these are not just simple walls of concrete; they are integrated systems designed to serve multiple objectives simultaneously. Prime Minister Jawaharlal Nehru famously referred to these projects as the 'Temples of Modern India', symbolizing their role in redeeming the nation's 'tryst with destiny' by bringing prosperity to the masses Rajiv Ahir, A Brief History of Modern India, Challenges Before the New-born Nation, p.591.

The primary philosophy behind these projects is the optimal utilization of water resources. Instead of letting river water flow wastefully into the sea or cause seasonal destruction through floods, these projects capture and redirect that energy for various human needs. The Damodar Valley Corporation (DVC), for instance, was modeled after the Tennessee Valley Authority (USA) to transform a 'river of sorrow' into a source of stability Majid Hussain, Environment and Ecology, Natural Hazards and Disaster Management, p.62. Typically, a project is categorized as 'multipurpose' if it fulfills several of the following goals:

• Irrigation: Providing a perennial water supply to drought-prone agricultural lands to ensure food security.
• Hydroelectric Power Generation: Harnessing the force of falling water to produce clean energy for industries and homes. For example, the Rana Pratap Sagar Dam in Rajasthan was specifically designed for this purpose Majid Husain, Geography of India, Energy Resources, p.22.
• Flood Control: Storing surplus water during monsoons to prevent downstream disasters Majid Hussain, Environment and Ecology, Natural Hazards and Disaster Management, p.62.
• Additional Benefits: These include inland navigation, fish breeding (pisciculture), soil conservation through controlled water flow, and recreation via the creation of large reservoirs.

Objective	Primary Benefit	Example Project
Flood Control	Prevents seasonal property/life loss	Hirakud Dam (Mahanadi)
Power Generation	Industrial & Rural electrification	Bhakra-Nangal (Sutlej)
Irrigation	Stabilizes agricultural yield	Nagarjunasagar (Krishna)

Sources: A Brief History of Modern India, Challenges Before the New-born Nation, p.591; Environment and Ecology, Natural Hazards and Disaster Management, p.62; Geography of India, Energy Resources, p.22

4. West-Flowing Rivers and the Tapi Basin (intermediate)

While the majority of Peninsular India’s rivers flow eastward into the Bay of Bengal due to the gentle tilt of the plateau, the Narmada and the Tapi are unique exceptions. These rivers flow westward into the Arabian Sea because they occupy rift valleys—linear depressions formed by the Earth's crustal movements (faulting) rather than standard erosion. These valleys are flanked by mountain ranges that dictate their course. NCERT Class IX, Drainage, p.21

The Tapi (or Tapti) River is often called the 'twin' or 'handmaid' of the Narmada. It originates from the Satpura Range near Multai in the Betul district of Madhya Pradesh. It flows westward for about 700 km, running nearly parallel to the Narmada but in a much more constricted form between the Satpura Range to its north and the Ajanta Range to its south Geography of India (Majid Husain), The Drainage System of India, p.20. Its basin is shared by three states: Madhya Pradesh, Maharashtra, and Gujarat. Unlike the delta-forming rivers of the east coast, the Tapi forms a broad estuary as it enters the Gulf of Khambat near the city of Surat. NCERT Class XI, Drainage System, p.24

In terms of water resource development, the Tapi basin houses critical infrastructure like the Ukai Dam (also known as the Vallabh Sagar). This project was specifically designed to harness the Tapi's waters for irrigation and power generation, providing a capacity of roughly 300 MW to industrial hubs like Surat and surrounding urban centers Geography of India (Majid Husain), Energy Resources, p.23. Other significant west-flowing rivers in the region include the Sabarmati and Mahi in Gujarat, and the Periyar and Bharathpuzha in Kerala. Because the coastal plains between the Western Ghats and the Arabian Sea are very narrow, these coastal rivers are relatively short compared to their Himalayan counterparts. NCERT Class IX, Drainage, p.21

Feature	Narmada River	Tapi River
Origin	Amarkantak Plateau (MP)	Satpura Range (Betul, MP)
Major Project	Sardar Sarovar Dam	Ukai Dam / Kakrapar Weir
Length	~1,312 km	~700 km

Sources: CONTEMPORARY INDIA-I, Geography, Class IX, NCERT (Revised ed 2025), Drainage, p.21; Geography of India, Majid Husain (McGrawHill 9th ed.), The Drainage System of India, p.20; INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Drainage System, p.24; Geography of India, Majid Husain (McGrawHill 9th ed.), Energy Resources, p.23

5. The Cauvery River System and Infrastructure (intermediate)

The **Cauvery (Kaveri) River**, often referred to as the 'Ganga of the South', is unique among Peninsular rivers because it remains relatively perennial. This is due to its geography: the upper catchment area in Karnataka receives rainfall from the **South-West Monsoon**, while the lower catchment in Tamil Nadu benefits from the **North-East (Retreating) Monsoon**. The river originates at **Talakaveri** in the Brahmagiri range of the Western Ghats and flows through a series of scenic gorges and waterfalls, most notably the **Hogenakkal Falls**, which marks the end of its plateau course before it enters the plains Geography of India, The Drainage System of India, p.21. To manage this vital resource, several major infrastructure projects have been developed across the basin. In Karnataka, the **Krishnaraja Sagar (KRS) Dam** is the primary reservoir, serving both irrigation and drinking water needs for cities like Bengaluru and Mysuru. Other significant upstream reservoirs include the **Hemavati**, **Harangi**, and **Kabini** Geography of India, The Drainage System of India, p.38. As the river crosses into Tamil Nadu, it is harnessed by the massive **Mettur Dam**, located near the confluence of the Bhavani and Moyar tributaries. This dam is the lifeline for the **Thanjavur delta**, a quadrant-shaped fertile region known as the 'Granary of South India' Geography of India, The Drainage System of India, p.21.

Major Dam	State	Key Purpose
Krishnaraja Sagar (KRS)	Karnataka	Irrigation and drinking water (confluence of Hemavati & Lakshmana Tirtha)
Mettur Dam	Tamil Nadu	Primary irrigation for the Cauvery Delta (Thanjavur)
Kabini Dam	Karnataka	Hydraulic support for the KRS system and local irrigation

Despite the infrastructure, the river is the center of a century-old legal battle. The **Cauvery Water Dispute** stems from agreements made in 1892 and 1924 between the Princely State of Mysore and the Madras Presidency. To resolve the sharing of waters between Karnataka, Tamil Nadu, Kerala, and Puducherry, the **Cauvery Water Disputes Tribunal** was established in 1990, with the Supreme Court providing a final verdict in 2018 to adjust the water-sharing ratios based on modern agricultural needs and urban demand Geography of India, The Drainage System of India, p.38.

Sources: Geography of India, The Drainage System of India, p.21; Geography of India, The Drainage System of India, p.38

6. Inter-State River Water Disputes and Governance (exam-level)

In a federal structure like India, rivers are the lifelines of the economy, but they also represent a significant point of friction because they don't respect political boundaries. To manage this, the Indian Constitution provides a unique framework under Article 262. This article is fascinating because it grants Parliament the power to adjudicate disputes relating to waters of inter-state rivers and, crucially, allows Parliament to exclude the jurisdiction of the Supreme Court and any other court in such matters Introduction to the Constitution of India, INTER-STATE RELATIONS, p.407.

Under this constitutional mandate, Parliament enacted two vital pieces of legislation in 1956 to govern our waters. The first is the River Boards Act, which focuses on the planning and development of river valleys. However, these boards are largely advisory. The second, and more debated, is the Inter-State River Water Disputes (ISWD) Act. This Act empowers the Central government to set up ad-hoc tribunals when a state government requests one, provided the dispute cannot be settled through negotiations Indian Polity, Inter-State Relations, p.167.

The table below clarifies the distinct roles of these two legal instruments:

Feature	River Boards Act, 1956	ISWD Act, 1956
Primary Purpose	Regulation and development of inter-state rivers.	Adjudication of specific water sharing disputes.
Nature of Authority	Advisory; set up by Center on request of states.	Binding; the tribunal's award has the force of a decree.
Legal Standing	Focused on coordination and technical advice.	Excludes the jurisdiction of the Supreme Court under Art 262.

While the ISWD Act states that the tribunal's decision is final and binding, the path to resolution is often long. Historically, these tribunals have taken decades to deliver awards (like the Cauvery or Krishna disputes), leading to recent legislative efforts to create a single, permanent tribunal to replace the current system of multiple ad-hoc bodies Indian Polity, Inter-State Relations, p.167.

Sources: Introduction to the Constitution of India, INTER-STATE RELATIONS, p.407; Indian Polity, Inter-State Relations, p.167

7. The Krishna River Basin: Dams and Tributaries (exam-level)

The Krishna River is the second-largest east-flowing peninsular river, originating near Mahabaleshwar in the Sahyadri range of Maharashtra. It traverses through Maharashtra, Karnataka, Telangana, and Andhra Pradesh before emptying into the Bay of Bengal. Understanding its basin requires a grasp of its massive dam infrastructure and the distinct network of its tributaries Geography of India, The Drainage System of India, p.21.

The river is punctuated by several engineering marvels. The Srisailam Dam is a standout feature; it is a massive gravity and masonry dam located in a deep gorge within the Nallamala Hills. It serves as a vital hydroelectric power hub for both Telangana and Andhra Pradesh. Further downstream lies the Nagarjuna Sagar Dam, one of the world's largest masonry dams, which provides irrigation to millions of acres of farmland Environment and Ecology, Distribution of World Natural Resources, p.22. In the upper reaches of Karnataka, the Almatti Dam (Lal Bahadur Shastri Dam) acts as the primary reservoir for the Upper Krishna Project.

To master the Krishna basin, you must distinguish between its left and right bank tributaries, as they define the geography of the Deccan Plateau:

• Right Bank Tributaries: These include the Koyna (famous for the Koyna Dam), Ghataprabha, Malprabha, and the Tungabhadra. The Tungabhadra is the largest tributary in terms of drainage area and is formed by the union of the Tunga and Bhadra rivers.
• Left Bank Tributaries: The Bhima is the longest tributary, while the Musi is well-known for flowing through the city of Hyderabad. The Munneru is another significant left-bank contributor in the lower basin.

Almatti

Dam/Project	Location/Feature	Significance
Srisailam	Nallamala Hills (AP/TS)	Major Hydroelectric station in a deep gorge.
Nagarjuna Sagar	Krishna River (AP/TS)	World's tallest masonry dam for irrigation.
Karnataka	Main reservoir for Upper Krishna irrigation.

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

8. Solving the Original PYQ (exam-level)

You have just mastered the Peninsular Drainage System, focusing on the complex network of east-flowing rivers. This question serves as the perfect application of those building blocks, requiring you to map Multipurpose River Valley Projects to their specific geographical basins. When approaching this, visualize the Krishna River originating from Mahabaleshwar and flowing through the Deccan Traps. The Srisailam Dam is a critical infrastructure point in this journey, situated deep within the Nallamala Hills. As a coach, I want you to remember that the Krishna basin is defined by three major landmarks: Almatti, Srisailam, and Nagarjuna Sagar. Identifying this spatial sequence is key to mastering Indian Geography.

To arrive at the correct answer, you must navigate through typical UPSC distractors designed to test the precision of your memory. The most common trap here is the Krishnaraja Sagar (KRS) Dam; many students incorrectly associate it with the Krishna River due to its name, but it is actually located on the Cauvery River in Karnataka. Similarly, the Mettur Dam is a primary reservoir for the Cauvery in Tamil Nadu, and the Ukai Dam belongs to the west-flowing Tapi River in Gujarat. By eliminating these projects based on their respective river basins as outlined in Geography of India by Majid Husain, you can conclude that Srisailam Dam is the only choice that fits the Krishna River profile.