Nearly two years after Gate No. 19 was washed away during severe flooding, the historic Tungabhadra Dam near Hosapete in Karnataka has been fully restored. With the replacement of all 33 crest gates, the dam has regained its full operational capacity, ensuring continued support for irrigation, hydropower generation, flood control, and water supply across large parts of southern India.
About Tungabhadra Dam
The Tungabhadra Dam, also known as Pampa Sagar, is one of the most important multipurpose river valley projects in India. It is built across the Tungabhadra River, the largest tributary of the Krishna River, near Hosapete in Ballari district of Karnataka.
Standing at a height of approximately 49.5 metres, the dam is equipped with 33 crest gates that regulate the release and storage of water. Since its completion, it has served as a lifeline for agriculture and economic development in the region by providing irrigation, generating hydroelectric power, controlling floods, and supplying water for domestic and industrial purposes.
Historical Background
The origins of the Tungabhadra Dam can be traced back to the pre-independence period. The project was initially conceived as a joint venture between the erstwhile Hyderabad State and the Madras Presidency. Following India's independence and the subsequent reorganization of states, the project became a collaborative effort between Karnataka and Andhra Pradesh.
The dam was completed in 1953, making it one of the earliest large-scale river valley projects undertaken in independent India. Over the decades, it has played a crucial role in transforming the agricultural landscape of the Deccan region.
Reservoir and Irrigation Importance
The Tungabhadra Dam has created a massive reservoir with a gross storage capacity of about 101 TMC (Thousand Million Cubic Feet) at the full reservoir level. This vast storage enables the regulation of river flows and ensures water availability during dry periods.
The irrigation system associated with the dam is extensive and highly significant. The Left Bank Canals primarily provide irrigation to agricultural lands within Karnataka, while the Right Bank Canals serve both Karnataka and the drought-prone Rayalaseema region of Andhra Pradesh. Through this network, the dam supports the cultivation of crops such as paddy, sugarcane, cotton, pulses, and several horticultural products.
Unique Engineering Feature
The Tungabhadra Reservoir occupies a special place in India's engineering history. Along with the Mullaperiyar Dam in Kerala, it is one of only two reservoirs in the country constructed using a combination of mud and limestone masonry. This distinctive construction technique reflects the engineering practices and technological capabilities of the period in which it was built.
Tungabhadra River
Origin and Course
The Tungabhadra River is the largest tributary of the Krishna River and derives its name from the confluence of two rivers—the Tunga and the Bhadra. Both rivers originate in the Western Ghats of Karnataka, a region known for its heavy rainfall and rich biodiversity.
The Tunga River, approximately 147 kilometres long, and the Bhadra River, about 178 kilometres long, meet near Koodli in Shivamogga district. From this confluence, the river flows as the Tungabhadra and travels approximately 531 kilometres before joining the Krishna River at Sangamaleshwaram in Andhra Pradesh.
Course Through States
The river flows for nearly 382 kilometres within Karnataka, forms the boundary between Karnataka and Andhra Pradesh for about 58 kilometres, and then continues for another 91 kilometres within Andhra Pradesh before merging with the Krishna River.
The river basin receives most of its water from the Southwest Monsoon, making monsoon rainfall crucial for maintaining its flow and supporting irrigation activities.
Tributaries and River System
Several tributaries contribute to the flow of the Tungabhadra River. Among the most important are the Varada River and the Hagari (Vedavathi) River. These tributaries enhance the river's discharge and support the ecological and agricultural productivity of the basin.
Major Dams on the River System
The Tungabhadra basin contains several important water infrastructure projects. These include the Tunga Anicut Dam, Bhadra Dam, Hemavathi Dam, and the Tungabhadra Dam itself. Together, these projects provide irrigation, drinking water, hydroelectric power, and flood management benefits to millions of people.
Significance of the Tungabhadra Dam
The Tungabhadra Dam remains one of the most significant water resource projects in southern India. It supports the livelihoods of millions of farmers, contributes to food security, generates electricity, and helps mitigate floods. The recent restoration of its crest gates has reinforced its strategic importance and ensured the continued sustainability of agriculture and economic development in both Karnataka and Andhra Pradesh.
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In every Lecture. Director Sir will provide conceptual understanding with around 800 Mindmaps.
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