In Maharashtra (India), Koyna Dam is one of the biggest dams. It is the rubble-concrete dam installed on the Koyna River in Mahabaleshwar, a mountain station in the district of Sahyadri. It is situated in Koyna Nagar, Satara district, on the state highway between Chiplun and Karad, in the Western Ghats.
Koyna Dam D05104
Koyna Nagar, Maharashtra
Government of Maharashtra
Dam and spillways
Type of dam
103.2 m (339 ft)
807.2 m (2,648 ft)
2,797,400,000 m3 (2,267,900 acre⋅ft)
891.78 km2 (344 sq mi)
Koyna dam foot powerhouse: 2 x 20 MW
Hydropower and drainage in neighboring areas is the main purpose of Dam. Koyna Hydroelectric Project is currently India’s largest hydropower plant with a total capacity of 1,920 MW built in this region. The Koyna River is seen as Maharashtra ‘ lifeline ‘ due to its potential electricity generation.
In the center is the spillway of the dam. It is fitted with six radial doors. The dam plays an essential role in monsoon flood control. The catchment area dams the Koyna river and forms the Shivasagar Lake which is approximately 50 km (31 mi) in length. It is one of the Indian independence’s biggest civil engineering ventures. The Koyna hydro-electric project is run by the Maharashtra State Electricity Board.
The dam has had several recent earthquakes, even the devastating earthquake of 1967 in Koynanagar, which has led to some cracks in the dam. After the disaster grouting of the cracks was done. Indian scientists have formulated an ambitious project to drill a deep borehole in the region and study the earthquake activity intensely. This would help to understand the forecast of earthquakes more effectively. The proposal is to drill up to 7 km and study the physical, geological and chemical processes and properties of the reservoir triggered earthquake zone in real-time. It would be a global project led by Indian scientists.
In 1973 the non-overflow portion of the dam was strengthened, followed by strengthening the spillway section in 2006. The dam is now expected to be safe from any future earthquake, even those with greater intensity than that of 1967.