Why in the News?
In a recent study, researchers from WELL Labs in Chennai studied Aralumallige and Doddathumakuru gram panchayats in the Upper Arkavathy watershed near Bengaluru, and found a sharp drop in groundwater levels caused by intensive farming practices.
What drives groundwater depletion in the Deccan Plateau?
- Hard Rock Aquifers with Low Storage Capacity: The Deccan Plateau is underlain by basalt and granite (hard rock aquifers) that have limited porosity. These rely on fractures and weathered zones to store water, making them less efficient in holding groundwater. Eg: In Karnataka, 99% of the area depends on such aquifers, making sustainable storage difficult.
- Deep Borewell Drilling Alters Natural Recharge: Borewells drilled into granite cause microfractures, allowing rainwater to bypass shallow aquifers and flow deep underground. This disrupts the natural recharge cycle and reduces groundwater retention.
- Water-Intensive Agriculture: Cultivation of vegetables, flowers, and exotic crops for urban markets like Bengaluru demands large volumes of groundwater. These crops are not suited to the dry, hard-rock geology of the region.
- Encroachment of Traditional Recharge Systems: Lakes and tanks, once used for groundwater recharge, are being encroached upon or neglected. Their discharge channels are blocked, eliminating natural recharge opportunities. Eg: The lake in Aralumallige (Karnataka), once a major recharge source, remained dry in 2022 despite heavy rainfall.
Why is reliance on borewells unsustainable in rural Karnataka?
- Rapid Groundwater Depletion and Borewell Failures: Continuous extraction through deep borewells causes the water table to drop, making it harder to access groundwater over time. Eg: In the Upper Arkavathy watershed, the average borewell depth increased from 183m to 321m in just two decades. Over 70% of drinking water wells failed within 10 years of construction.
- High Financial Burden on Farmers and Panchayats: Drilling deeper borewells costs ₹4–5 lakh, often unaffordable for small farmers, with no guarantee of success. Free electricity for pumping increases electricity consumption and debt for gram panchayats. Eg: Panchayats face mounting electricity bills, diverting funds away from development works to cover power costs.
- Disruption of Natural Recharge and Local Hydrology: Borewells alter subsurface geology, causing rainwater to bypass shallow aquifers, reducing natural recharge. Eg: In Aralumallige and Doddathumakuru, borewell drilling weakened long-term water retention, contributing to chronic scarcity despite seasonal rains.
What is the socio-economic impact on local communities and governance?
- Rising electricity debt: Free power for farmers fuels overuse, pushing gram panchayats into unsustainable debts as they divert development funds to pay power bills.
- Borewell burden on small farmers: Drilling costs ₹4-5 lakh with no assurance of success, leading many farmers to lease land and migrate to cities.
What are the issues related to groundwater in Indian?
- Overexploitation and Depletion: Unregulated extraction of groundwater for agriculture and urban use has led to rapid depletion of water tables. Eg: In parts of Punjab, Haryana, and Karnataka (like Aralumallige), water tables have fallen by over 100 meters in two decades due to borewell dependence.
- Poor Groundwater Quality: Contamination by nitrates, fluoride, and arsenic poses serious health risks, especially in rural areas. Eg: In Bihar and West Bengal, arsenic contamination affects drinking water; in Karnataka, nitrate levels often exceed safe limits (50 mg/l).
- Inadequate Data and Poor Management: Lack of real-time monitoring, insufficient local-level data, and fragmented water governance hinder sustainable planning. Eg: Despite groundwater overuse, local panchayats often lack predictive tools to estimate borewell failure or manage recharge zones effectively.
What are the steps taken by the Indian Government?
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Way forward:
- Promote Sustainable Farming Practices: Shift from water-intensive crops (like paddy, sugarcane) to less water-demanding crops suited to agro-climatic conditions.
- Strengthen Local Water Governance: Empower Gram Panchayats to manage groundwater through community water budgeting, real-time monitoring, and local recharge efforts.
Mains PYQ:
[UPSC 2019] Enumerate the indirect taxes which have been subsumed in the goods and services tax (GST) in India. Also, comment on the revenue implications of the GST introduced in India since July 2017.
Linkage: The article talks about the GST replaced many older taxes like VAT and excise duty, helping create a single national market. Although GST collections have steadily grown—reaching ₹22.08 lakh crore in 2024–25—the revenue from tobacco (about ₹551 billion a year) is much less than the huge cost of tobacco-related health problems, which is ₹2,340 billion every year.
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