Explanation: The Idukki dam, located in the Idukki district of Kerala, India, is a significant hydroelectric project and holds the distinction of being the first arch dam in Asia. An arch dam is a type of dam that is curved upstream, allowing it to withstand the pressure of the water it holds back by transferring the load to the abutments (the sides of the valley or canyon) through the arch action. This design is particularly effective in narrow canyons and gorges where the natural topography can provide strong support.
The Idukki dam was constructed across the Kuravan and Kurathi hills, which are part of the Western Ghats, a mountain range that runs parallel to the western coast of India. The dam was completed in 1975 and is a crucial part of the Idukki reservoir, which is one of the largest in India. The reservoir is formed by the confluence of three rivers: the Periyar, the Thalayar, and the Cheruthoni.
The construction of the Idukki dam was a significant engineering feat, as it required the precise alignment of the arch with the natural rock formations of the Kuravan and Kurathi hills. The dam's design and construction were innovative for the time, and it has since become a model for other arch dams around the world.
The Idukki dam is not only a source of hydroelectric power but also serves as a symbol of Kerala's development and engineering prowess. It is a popular tourist destination and a testament to the state's commitment to sustainable energy production. The dam's location in the scenic Western Ghats also makes it an important part of Kerala's natural and cultural heritage.
In summary, the Idukki dam is the correct answer because it is the first arch dam in Asia, constructed across the Kuravan and Kurathi hills in Kerala. It is a significant hydroelectric project and a landmark in the state's infrastructure, showcasing the engineering and technological advancements of the region.