Note4Students
From UPSC perspective, the following things are important :
Mains level: Challenges related to water resources;
Why in the News?
The Central Ground Water Board (CGWB) found that many states in India are facing a serious problem with high nitrate levels in groundwater.
What are the contaminants?The assessment of India’s groundwater quality has identified several significant contaminants, primarily driven by agricultural practices, industrial activities, and natural geological factors. The key contaminants include:
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What was the state of groundwater in 2024?
- Overall Extraction Rate: The degree of groundwater extraction across the country was reported at approximately 60.4%, indicating that this level has remained relatively stable compared to previous years. This figure reflects the percentage of groundwater resources being utilized versus what is available for extraction.
- Safe Blocks: About 73% of groundwater blocks were categorized as ‘safe,’ meaning they are adequately replenished to meet extraction demands. This represents a slight increase from previous assessments.
- Recharge and Availability: Total annual groundwater recharge was noted to have decreased marginally from 449 BCM (Billion Cubic Meters) in 2023 to 446.90 BCM in 2024.
- The annual extractable groundwater resources slightly declined from 407.21 BCM to 406.19 BCM.
- Contamination Issues: Despite improvements in some areas, challenges remain, particularly with nitrate contamination, where 440 districts were identified as having excessive nitrate levels in their groundwater.
How are groundwater levels measured?
Groundwater levels are measured using a network established by the Central Ground Water Board (CGWB), which includes:
- Observation Wells: Approximately 26,000 observation wells are used for manual measurements of groundwater levels.
- Digital Monitoring: Since 2023, around 16,000 to 17,000 piezometers equipped with digital recorders have been installed to automatically measure and transmit groundwater levels to a centralized system for real-time monitoring.
What happens if nitrate presence is high in groundwater?
- Health Risks: Elevated nitrate levels can cause methemoglobinemia, also known as “blue baby syndrome,” particularly in infants under six months old. This condition reduces the blood’s ability to carry oxygen, resulting in a bluish tint to the skin and potentially severe health complications if untreated.
- Environmental Concerns: Excessive nitrates contribute to algal blooms in surface water bodies, which can deplete oxygen levels, harm aquatic ecosystems, and disrupt the balance of marine life.
Way forward:
- Sustainable Agricultural Practices: Promote the use of organic fertilizers, precision farming techniques, and regulated use of nitrogen-based fertilizers to minimize nitrate leaching into groundwater.
- Strengthened Monitoring and Remediation: Expand digital groundwater monitoring networks, enforce strict industrial discharge regulations, and implement remediation techniques like bioremediation and constructed wetlands to mitigate contamination.
Mains PYQ:
Q What is water stress? How and why does it differ regionally in India?(UPSC IAS/2019)
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