The Tungabhadra Dam Explained

The Tungabhadra Dam is a masonry and concrete dam across the Tungabhadra River near Hospet in Vijayanagara district of Karnataka, built mainly in the 1940s and early 1950s, and it forms the Tungabhadra reservoir, also called Pampa Sagar. The dam stores water for irrigation, drinking supply and hydropower, and it is a shared asset of Karnataka, Andhra Pradesh and Telangana, whose water entitlements are administered by the Tungabhadra Board.

Tungabhadra Dam is one of the largest stone masonry dams in India and one of the key irrigation structures of peninsular India. It lies in the dry interior of the Deccan plateau, close to the ruins of Hampi, the capital of the Vijayanagara Empire. This explainer covers the dam’s location and design, the sharing of its water, its siltation problem and the 2024 gate incident. Dimensions and quantities are approximate and are given as commonly reported.

Key Takeaways

• The Tungabhadra Dam is a stone masonry dam across the Tungabhadra River near Hospet in Vijayanagara district, Karnataka, completed in the early 1950s.
• The Tungabhadra reservoir, also called Pampa Sagar, was designed to hold roughly 130 TMC of water, though siltation has reduced its usable capacity over the decades.
• The Tungabhadra Board, headquartered at Hospet, regulates the sharing of Tungabhadra water among Karnataka, Andhra Pradesh and Telangana.
• The Tungabhadra Dam feeds a network of canals, including the Low Level Canal and High Level Canal, which irrigate dry districts across state borders.
• The Tungabhadra Dam suffered the failure of one crest gate in August 2024, which led to large releases of water and an emergency repair.
• The Tungabhadra Dam lies near Hampi, where the Vijayanagara rulers built canals and anicuts on the same river several centuries earlier.

What is the Tungabhadra Dam?

The Tungabhadra Dam is a large irrigation and power project on the Tungabhadra River in Karnataka, built to store monsoon flow for use in the dry plains of the Deccan. It is a composite structure of stone masonry and concrete with a long line of crest gates, and the project is jointly used by several states.

The project was conceived before independence, when the then princely state of Hyderabad and the Madras Presidency agreed to build a dam jointly. Both areas were prone to drought, and the river offered one of the few reliable sources in the region. After independence, the project was completed and put under the Tungabhadra Board, a statutory body created to run it on behalf of the participating governments.

The dam is sometimes referred to by its location at Mallapuram, a small settlement near Hospet, and the reservoir is called Pampa Sagar after Pampa, the old name of the Tungabhadra in Hindu tradition and the origin of the name Hampi.

Where is the Tungabhadra Dam located?

The Tungabhadra Dam is located near Hospet in Vijayanagara district, Karnataka, on the Tungabhadra River at the border of the Ballari region. Vijayanagara district was carved out of Ballari district in 2021, so older references may place the dam in Ballari district.

The river rises in the Western Ghats as two separate streams, the Tunga and the Bhadra, which join at Kudli near Shivamogga. The combined river flows north-east across the Deccan plateau, passes Hampi, and later joins the Krishna River near the border between Andhra Pradesh and Telangana. The Tungabhadra is therefore one of the major tributaries of the Krishna.

Hospet is a railway and steel town, and the dam is an important tourist attraction in its own right, with gardens, a viewing area and a musical fountain. The reservoir lies only a short distance from the Hampi World Heritage Site, which has been protected by the Archaeological Survey of India and listed by UNESCO since 1986.

How was the Tungabhadra Dam built?

The Tungabhadra Dam was built as a joint project of the Hyderabad state and the Madras Presidency, with work starting in the 1940s and the main dam completed in the early 1950s. The design used rubble and stone masonry laid in lime-surkhi mortar, which was common for large Indian dams before the wide use of modern concrete.

The lime-surkhi mortar was made from lime and burnt clay or brick powder, a traditional binding material used in Indian construction for centuries. Engineers favoured it because stone was available locally and labour was plentiful. Parts of the structure, especially spillway sections and gate piers, were built with concrete.

The construction relied on thousands of workers and on local quarrying, and it was one of the largest civil works in the Deccan at that time. Later additions included the canal network, the powerhouses and strengthening work. After the reorganisation of states in 1956, the project passed to the successor states, and the Tungabhadra Board continued as a joint body.

How is Tungabhadra water shared between states?

Tungabhadra water is shared among Karnataka, Andhra Pradesh and Telangana through allocations that are managed by the Tungabhadra Board, which was set up in 1953 and has its headquarters at Hospet. The Board regulates releases from the dam into the main canals according to the agreed shares and a cropping calendar.

When the project was planned, the participating partners were Hyderabad state and Madras state. After the creation of linguistic states, the shares were carried over to Karnataka and Andhra Pradesh, and after the formation of Telangana in 2014, Telangana became a member as the successor to the Hyderabad share. The Board works under the Ministry of Jal Shakti of the Government of India.

Disputes over river water in the Krishna basin, which includes the Tungabhadra, are handled under the Inter-State River Water Disputes Act, 1956, and the Krishna Water Disputes Tribunals have issued awards on the larger basin. The Krishna River Management Board (KRMB) also has a role in overseeing sharing within the Krishna basin.

What the Tungabhadra Board does

• Regulates releases from the dam into the left and right bank canals.
• Maintains the dam, gates and associated works on behalf of the member states.
• Records inflows, storage and distribution of water through the year.
• Coordinates the water year calendar for the kharif and rabi crops.

Which canals take water from the Tungabhadra Dam?

The Tungabhadra Dam feeds several canals, chiefly the Tungabhadra Left Bank Canal in Karnataka, the Low Level Canal and High Level Canal on the right bank and a set of older channels from the Vijayanagara period. Together they carry water into Karnataka districts such as Ballari, Koppal and Raichur and into the dry districts of Andhra Pradesh, such as Anantapur and Kurnool, depending on the canal.

The old Vijayanagara channels, including the Raya and Basaveshwara canals, are older than the dam itself and were built several centuries ago to irrigate land around the Hampi region. They remain in use and are an example of how irrigation has been practised on the river for a very long time.

Canal capacities and command areas change over time with modernisation and siltation, so the table lists the broad pattern rather than exact figures.

How much power does the Tungabhadra Dam generate?

The Tungabhadra Dam supports hydropower stations with a combined capacity of a few tens of megawatts, operated by the power utilities of the beneficiary states. These plants use the controlled releases from the dam, and their output follows the irrigation schedule more than electricity demand.

Because irrigation has priority, the powerhouses typically run when water is released for crops rather than when the grid needs peak power. This makes the hydro contribution small in national terms, though locally it provides useful renewable generation and helps utilities meet their energy needs. In dry years the generation drops sharply.

In addition to the main powerhouses, there are smaller stations on the canals that use the drop in water level along the channel. Capacities and operators change as plants are renovated, so the latest details should be taken from the utilities concerned.

Why is siltation a problem at the Tungabhadra Dam?

Siltation is a problem at the Tungabhadra Dam because sediment brought down by the river settles in the reservoir and reduces its storage capacity, which was originally around 130 TMC (thousand million cubic feet). Over seven decades, studies have estimated that the reservoir has lost a significant share of that capacity, with figures commonly cited as tens of TMC, though estimates differ between surveys.

The river carries large amounts of silt because its catchment has erodible soils and areas of intensive farming and mining. As the silt builds up, the dam can store less water for the dry season, which hurts the farmers who depend on the canals. This is a problem faced by many old Indian reservoirs.

Several remedies have been discussed over the years. Desilting a reservoir of this size is technically difficult and expensive, so most proposals focus on catchment treatment and on building a balancing reservoir elsewhere on the river to store the water that would otherwise flow out. A proposal for a balancing reservoir near Navali in Koppal district has been discussed, though it requires agreement among the states and has not been universally accepted.

Options discussed to manage the storage loss

• Catchment area treatment to reduce erosion in the upper basin.
• A balancing reservoir downstream to capture surplus flows.
• Improved canal efficiency to use less water per hectare.
• Regular bathymetric surveys to measure the true remaining capacity.

What happened at the Tungabhadra Dam in August 2024?

In August 2024, one of the crest gates of the Tungabhadra Dam came loose during heavy inflows and was swept away, causing a sudden uncontrolled release of water and prompting an emergency response. The incident drew national attention because it affected a dam that had stood for around seven decades and supplies several states.

Authorities opened other gates to lower the water level so that repair work could proceed, and a temporary closure of the open gate space was installed over the following days using stoplog elements. Residents downstream were alerted, and the water that was released added to the flow of the Tungabhadra towards the Krishna. Reports at the time described the cause as a failure in the gate’s lifting arrangement, and expert committees were asked to examine the gates.

The episode led to discussion about the condition of ageing gates and the need for periodic inspection and replacement. Technical reviews were reported to have suggested that the crest gates, being original equipment from the 1950s, might need to be replaced or refurbished in a phased manner. Details of the review and the repair programme should be taken from official statements, as work and findings continued to develop.

How does the Tungabhadra Dam relate to Hampi and the Vijayanagara Empire?

The Tungabhadra Dam relates to Hampi because both depend on the same river, and the Vijayanagara rulers who built Hampi in the fourteenth to sixteenth centuries had already developed irrigation channels and anicuts on the Tungabhadra. The Vijayanagara Empire’s capital lay on the south bank of the river, only a short distance from the present dam.

The empire built stone weirs across the river and cut canals to bring water to fields, tanks and the city. Some of these channels are still in use, and they are often cited as early examples of large-scale irrigation engineering in the Deccan. The modern dam builds on the same idea of storing and diverting the river, but on a much larger scale.

Today, the reservoir and the ruins form part of the same regional landscape. The Hampi group of monuments is a UNESCO World Heritage Site, and the dam’s reservoir lies upstream of the main monuments, which makes water management a matter that touches both development and heritage.

Why does the Tungabhadra Dam matter?

The Tungabhadra Dam matters because it supplies irrigation and drinking water to a drought-prone region spread across three states, and it is one of the oldest large multipurpose projects in southern India. Farmers growing paddy, cotton, chilli and other crops depend on the canals, and several towns rely on the river for their supply.

The dam also illustrates the challenges of shared rivers. Water sharing across state boundaries, ageing equipment, siltation and climate variability make management difficult, and the Tungabhadra Board is a long-running example of cooperative governance. Climate change and changes in monsoon patterns add to these pressures, because storage is only useful if rainfall fills it.

Under the Dam Safety Act, 2021, large dams like Tungabhadra come under the oversight of the National Dam Safety Authority and state dam safety organisations, which require regular inspections and safety reviews. This framework is designed to catch problems early, including those that affect gates and other mechanical parts.

Bottom Line

The Tungabhadra Dam is a historic masonry dam that stores the Tungabhadra River for irrigation, drinking water and power across Karnataka, Andhra Pradesh and Telangana. Its main challenges are siltation, ageing gates and fair water sharing, which the Tungabhadra Board and the state governments continue to manage. Readers should consult official sources for current reservoir levels and repair updates.

Frequently Asked Questions

Where is the Tungabhadra Dam located?

The Tungabhadra Dam is located near Hospet in Vijayanagara district of Karnataka, at a place called Mallapuram. It is built across the Tungabhadra River. Older references may say Ballari district, because Vijayanagara district was created from it in 2021.

What is the Tungabhadra reservoir called?

The reservoir of the Tungabhadra Dam is called Pampa Sagar, and it is also known simply as the Tungabhadra reservoir. The name comes from Pampa, an old name of the river. It was designed to hold roughly 130 TMC of water, though siltation has reduced its usable capacity.

Who manages the Tungabhadra Dam?

The Tungabhadra Dam is managed by the Tungabhadra Board, a statutory body headquartered at Hospet, working with the participating state governments. The Board regulates releases and shares water among Karnataka, Andhra Pradesh and Telangana. Hydropower stations are run separately by the state power utilities.

Which states benefit from the Tungabhadra Dam?

The Tungabhadra Dam benefits Karnataka, Andhra Pradesh and Telangana. Karnataka uses the water mainly in its Ballari, Koppal and Raichur districts, while Andhra Pradesh uses it in dry districts such as Anantapur. Telangana receives a share as the successor to the original Hyderabad state entitlement.

What happened to the Tungabhadra Dam gate in 2024?

In August 2024, one crest gate of the Tungabhadra Dam was washed away during heavy inflows, causing a large release of water. Authorities lowered the reservoir level and installed temporary stoplog elements to close the opening. Experts then reviewed the condition of the other gates, many of which date from the 1950s.

Why is silt a concern at the Tungabhadra Dam?

Silt is a concern at the Tungabhadra Dam because it settles in the reservoir and reduces the space available to store water. The original capacity of roughly 130 TMC has declined by tens of TMC according to various surveys. Remedies discussed include catchment treatment and a balancing reservoir downstream.

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