Spatial distribution and conservation of Groundwater resources in India.

Groundwater Resources in India: Distribution & Conservation

Introduction

India is the largest user of groundwater in the world, accounting for 25% of the global extraction. Groundwater is a critical resource for irrigation (supporting 60% of irrigated agriculture) and drinking water. However, its distribution is highly uneven due to varying geological and climatic conditions.

Spatial Distribution of Groundwater

  • The Alluvial Plains: The Indo-Gangetic-Brahmaputra plains have the highest groundwater potential. The thick layers of porous alluvium allow for easy recharge and storage. However, regions like Punjab and Haryana face critical over-exploitation.
  • Peninsular Hard Rock Region: In the Deccan Plateau and central India, groundwater is stored in fissures, fractures, and weathered parts of crystalline rocks (Basalt, Granite). The storage capacity is low, making these regions prone to water scarcity during summers.
  • Coastal Areas: While groundwater is available, these regions face the risk of saline water intrusion due to over-pumping near the sea.
  • Hilly Regions: In the Himalayas and Western Ghats, groundwater manifests as natural springs. The steep slope limits large-scale aquifer storage.

Conservation Strategies

  • Managed Aquifer Recharge (MAR): Utilizing Check Dams, percolation tanks, and Rainwater Harvesting to artificially replenish depleted aquifers.
  • Demand-Side Management: Shifting from water-intensive crops (like Sugarcane and Paddy) to millets and pulses. Promoting Micro-irrigation (Drip and Sprinkler) through Per Drop More Crop.
  • Institutional Measures: Implementation of the Atal Bhujal Yojana for community-led groundwater management and the Central Ground Water Authority (CGWA) guidelines for industrial extraction.
  • Legislative Support: Enacting Model Groundwater Bills at the state level to regulate borewell depth and prevent commercial exploitation.

Conclusion

Groundwater is a 'common pool resource' that requires a shift from "exploitation" to "sustenance." Integrated water management, combining traditional knowledge with modern geospatial mapping, is essential to ensure India's water security by 2030.