Water scarcity, dams, rainwater harvesting, and multi-purpose river valley projects
Though 71% of Earth's surface is water, only 2.5% is freshwater and just 1% is accessible. India receives adequate rainfall, but faces water scarcity due to:
• Uneven distribution of rainfall (some areas flood, others are arid)
• Over-exploitation of groundwater for agriculture and industry
• Pollution of water bodies
• Growing population and increased demand
• Loss of traditional water harvesting systems
Multi-purpose projects serve many functions simultaneously — Jawaharlal Nehru called them "temples of modern India."
• Irrigation: Provide water to agricultural land throughout the year
• Electricity generation: Hydroelectric power (clean, renewable)
• Flood control: Regulate river flow during monsoons
• Water supply: Drinking water to cities
• Navigation: Helps river transport
• Tourism: Reservoirs become recreational areas
Despite benefits, large dams have serious drawbacks:
• Displacement: Millions of people (mostly tribal and rural poor) displaced from reservoir areas
• Ecological damage: Forest submergence, loss of biodiversity, altered river ecosystems
• Inter-state conflicts: Disputes over river water sharing (Cauvery, Krishna, Narmada)
• Sedimentation: Dams trap silt → rivers lose capacity → flood plains become less fertile
• Narmada Bachao Andolan (NBA): Movement led by Medha Patkar and Baba Amte against the Sardar Sarovar Dam — highlighted displacement of 40,000 families
India has a rich tradition of water harvesting — collecting and storing rainwater for future use:
Tamil Nadu was the first state to make rooftop rainwater harvesting mandatory for all buildings. Result: Groundwater levels improved significantly in Chennai within a few years. This shows how reviving traditional practices can solve modern water crises!