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The Tehri dam is the highest dam in India and one of the highest in the World. The Tehri dam withholds a reservoir of capacity 4.0 km3 and surface area 52 km2. It is used for irrigation, municipal water supply, and the generation of 1000 MW of hydroelectricity.The Tehri Dam has been the object of protests. Environment activist Shri Sunder Lal Bahuguna led the “Anti Tehri Dam Movement” from the 1980s to 2014. The protest was against the displacement of town inhabitants and environmental consequences of the weak ecosystem. The relocation of more than 1,00,000 people from the area has led to protracted legal battles over resettlement rights and ultimately resulted in the delayed completion of the project.(a) How is hydropower harnessed?(b) Define 1 MW.(c) Mention two disadvantages of constructing the Tehri Dam.(d) What happens when water from great heights is made to fall on the blades of turbine?
(a) Hydropower is generated by collecting the water in a reservoir behind the dam and releasing the stored water to turn a turbine that will produce electricity.
(b) 1 MW or a megawatt is a unit for measuring power equivalent to one million watts.
1 MW (1 Megawatt) = 1,000 kW (1,000 kilowatts).
(c) The two disadvantages of constructing the Tehri Dam are loss of biodiversity in the catchment area and large-scale displacement of residents.
(d) When water from great heights is made to fall on the blades of a turbine, the blades move and convert the kinetic energy of water into electrical energy.
Updated on: 18-Jan-2023
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