UPSC Relevance
- GS 1 (Geography): Rainfall patterns, monsoon dependence, droughts, and regional water scarcity
- GS 2 (Governance): State-level initiatives, public-private partnerships, ethical and legal issues in weather modification
- GS 3 (Science & Technology, Environment): Weather modification technology, AI-driven climate models, implications for agriculture, water security, and pollution control
- Current Affairs: Project Varshadhari (Karnataka), cloud seeding trials in Maharashtra and Rajasthan, AI and drone-assisted weather modification
- Essay & Ethics: Climate ethics, human intervention in natural processes, equity in resource distribution
Cloud seeding is a weather modification technique designed to artificially enhance rainfall by dispersing substances into clouds to accelerate droplet formation. India, being highly dependent on monsoon rains, has experimented with cloud seeding in drought-prone regions and major cities facing water and pollution crises. States like Maharashtra, Karnataka, and Rajasthan have led pilot projects, supported by IITM Pune, ISRO, and private partners.
How Cloud Seeding Works
- Static Seeding: Silver iodide stimulates ice crystal formation, inducing precipitation in cold clouds.
- Dynamic Seeding: Enhances vertical air currents in clouds, improving rain potential.
- Hygroscopic Seeding: Uses salt particles (NaCl, KCl) to enlarge droplets in warm clouds.
- Dispersion Methods: Aircraft, drones, and ground-based generators.
Why India Needs Cloud Seeding
- Mitigate droughts in Maharashtra, Karnataka, and Rajasthan.
- Support agriculture by ensuring rainfall for paddy, wheat, and pulses.
- Replenish groundwater and reservoirs.
- Address urban water crises in Bengaluru, Chennai, and Delhi.
- Reduce smog and pollution in Delhi and Mumbai.
- Stabilize hydropower generation in Himachal Pradesh, Uttarakhand, and Northeast India.
Case Studies in India
- Maharashtra: Cloud seeding in Vidarbha and Marathwada since 2003; ₹30 crore project (2018) with ISRO and IITM Pune; expansion planned with AI-based monitoring.
- Karnataka: Project Varshadhari (2017–2019), ₹91 crore investment for Bengaluru and drought-hit districts; 2025 plans for drone-assisted precision seeding.
- Rajasthan: Trials for arid-zone rainfall enhancement; testing nanoparticle-based seeding materials with PPP support.
Challenges and Roadblocks
- Effectiveness: Works only with pre-existing clouds; success rate 10–30%.
- Environmental Concerns: Silver iodide toxicity risks, though considered minimal at low levels.
- High Costs: ₹2–5 crore per operation; questions of financial sustainability.
- Geopolitical & Ethical Issues: Risk of disputes over artificial rainfall distribution; absence of clear international regulatory framework.
- Alternatives: Groundwater recharge, desalination, and watershed management may be more cost-effective in some cases.
Future Prospects
- AI-driven weather forecasting for optimal seeding windows.
- Satellite and drone-based monitoring for precision targeting.
- Nanoparticle-based materials as eco-friendly alternatives.
- Potential role in national water security strategy if cost-efficiency improves.
Conclusion
Cloud seeding offers a promising but limited tool for tackling India’s water and pollution crises. While Maharashtra, Karnataka, and Rajasthan show potential through experimentation, high costs, modest success rates, and environmental concerns remain hurdles. With AI, drones, and eco-friendly materials, cloud seeding could evolve into a supplementary strategy for drought management.