Explanation: An arch dam is a type of dam that is curved in shape and is designed to withstand the pressure of water by transferring the load to the abutments (the sides of the valley). The curvature of the dam allows it to resist the horizontal thrust of the water, making it an efficient and strong structure for holding back large volumes of water.
In the context of Kerala, the Idukki Dam is a prime example of an arch dam. Located in the Idukki district, the dam is situated across the Periyar River and is part of a series of dams that form a reservoir for hydroelectric power generation. The Idukki Dam is one of the most significant hydroelectric projects in India and is known for its unique design and location in the Western Ghats.
The Idukki Dam is not just a dam but a complex system that includes two other dams: the Cheruthoni and the Kulamavu. Together, these dams form a reservoir that is used for power generation. The arch design of the Idukki Dam is crucial for its functionality, as it allows the dam to withstand the immense pressure of the water in the reservoir.
Other dams in Kerala, such as the Malankara Dam, Malampuzha Dam, and Chulliar Dam, do not have the arch design that characterizes the Idukki Dam. The Malankara Dam is a small irrigation dam, the Malampuzha Dam is a gravity dam used for irrigation and drinking water supply, and the Chulliar Dam is not a well-known dam in Kerala and does not fit the description of an arch dam.
Understanding the type of dam and its specific characteristics is important for comprehending the engineering and geographical aspects of water management in Kerala. The Idukki Dam stands out as a significant example of an arch dam due to its design, location, and role in hydroelectric power generation.