Why in the News?
Bengaluru is facing an acute groundwater crisis driven by over-extraction, weak recharge systems, and rising urban demand. The issue reflects a deeper structural imbalance between natural resource availability and urban growth patterns.
Why is Bengaluru facing acute groundwater stress despite overall state-level improvement?
- Over-extraction: Groundwater withdrawal at 378% in Bengaluru East Taluka exceeds sustainable limits; Karnataka average at 66%.
- Hydrogeological Constraints: Crystalline rock formations store limited water and recharge slowly.
- Urban Demand Concentration: High-density zones like tech parks and apartments increase per-capita consumption.
- Surface Water Dependence: Increasing reliance on Cauvery water, involving high economic and infrastructural costs.
How has unplanned urbanisation aggravated the crisis?
- Loss of Recharge Zones: Built-up areas prevent rainwater percolation; example: concretisation of urban landscapes.
- Sealing of Land: Preference for grey infrastructure reduces groundwater replenishment.
- Demand-Supply Mismatch: Rapid population growth without proportional infrastructure expansion.
- Ecological Degradation: Decline in lakes and wetlands disrupts natural hydrological cycles.
What are the governance and policy gaps in water management?
- Fragmented Management: Lack of integration between pipeline supply, groundwater, and wastewater systems.
- Inefficient Distribution: High transmission losses in pipeline networks.
- Regulatory Failure: Weak enforcement against over-extraction of groundwater.
- Project Inefficiency: Government scheme (775 MLD supply to 110 villages) achieved only partial coverage.
What are the socio-economic implications of the crisis?
- Tanker Economy Dependence: Citizens rely on expensive private water tankers.
- Inequality in Access: Vulnerable populations face disproportionate water stress.
- Rising Costs: High cost of Cauvery water expansion passed to consumers.
- Urban Vulnerability: Expansion of crisis to new areas like Koramangala and Hebbal indicates systemic risk.
What measures have been taken and why are they insufficient?
- Treated Wastewater Use: BWSSB using sewage water to recharge lakes.
- Infrastructure Projects: Partial success in water supply expansion schemes.
- Short-term Focus: Lack of long-term aquifer management strategies.
- Absence of Integration: No unified approach to water cycle management.
Why is the ‘Sponge City’ model critical for Bengaluru?
- Rainwater Capture: Restores lake-well connectivity to absorb monsoon runoff.
- Recharge Enhancement: Increases groundwater replenishment capacity.
- Urban Planning Integration: Aligns land-use with hydrological capacity.
- Reduced Surface Sealing: Encourages permeable surfaces and green infrastructure.
Conclusion
Bengaluru’s crisis reflects a governance failure rather than a resource deficit. Sustainable urban water management requires integration of supply systems, strict regulation, and a shift towards nature-based solutions like the sponge city model.
PYQ Relevance
[UPSC 2024] The world is facing an acute shortage of clean and safe freshwater. What are the alternative technologies which can solve this crisis?
Linkage: Technologies addressing real-world crises like freshwater scarcity are frequently tested in Prelims (concepts) and Mains (application-based analysis). The Bengaluru water crisis exemplifies this trend, linking urban governance failure with the need for alternative technologies like wastewater recycling, desalination, and aquifer recharge.
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