Below-Normal Monsoon Forecast: ENSO Impact and Water Management Imperatives
Contents4
Indian Express - Opinion · 2 May 2026 · 2 min read
Prelims · Environment Mains · GS3 Environment and biodiversity High relevance
IMD predicts a below-normal monsoon due to El Niño Southern Oscillation (ENSO), highlighting urgent need for water conservation and management strategies to mitigate climate-induced water stress.
Key points
El Niño Southern Oscillation (ENSO): The primary cause of this year's below-normal monsoon forecast, ENSO's warming phase (El Niño) typically reduces monsoon rainfall in India, while La Niña enhances it. This cyclical phenomenon is intensifying in frequency and impact due to climate change.
Indian Ocean Dipole (IOD): Acting as a counterbalance to ENSO, the IOD's positive phase could mitigate some rainfall deficits in the latter half of the monsoon season, though its effect is limited compared to ENSO's dominance.
Spatial-Temporal Rainfall Variability: Future monsoons are predicted to have concentrated geographic footprints and shorter durations, increasing risks of floods and droughts simultaneously across regions—a critical concern for GS3 (Disaster Management).
Water Reuse Statistics: India currently reuses only 3% of treated wastewater, starkly lower than Singapore's 40%, underscoring inefficiencies in water management systems and missed opportunities in circular water economy models.
Historical Water Conservation: Traditional systems like temple tanks and bunds, now often encroached upon, demonstrate ancient India's sophisticated rainwater harvesting techniques—relevant for GS1 (Indian Heritage) on sustainable practices.
Economic Implications: Erratic monsoons directly affect agricultural output (60% of India's farmland is rain-fed), potentially destabilizing food security and rural incomes—key for GS3 (Agriculture) and Economy topics.
[GS2-Governance] The book 'Water, Nature and Progress' proposes a PPP framework for water reuse, drawing from Surat and Thane's models, suggesting policy innovations for urban water governance.
Way Forward: Implement mandatory rainwater harvesting in urban planning, scale up wastewater treatment to 50% capacity by 2028 via PPPs, and integrate climate-resilient water management into the National Water Policy.
Key terms
- Indian Ocean Dipole (IOD)
- An irregular oscillation of sea-surface temperatures in the Indian Ocean, influencing monsoon variability. Its positive phase enhances rainfall over India, while the negative phase suppresses it. Understanding IOD is essential for GS1 (Climatology) and disaster preparedness strategies.
- Circular Water Economy
- An economic model treating wastewater as a reusable resource rather than waste, involving treatment, recycling, and efficient distribution. Singapore's NEWater program exemplifies this, offering lessons for India's urban water scarcity challenges—relevant for GS3 (Environment) and Governance.
- Temple Tanks
- Ancient water reservoirs attached to temples, serving both ritualistic and practical water storage purposes. These represent India's traditional water conservation wisdom, now recognized under the National Mission for Cultural Heritage and Water—linking GS1 (Culture) with GS3 (Water Resources).
- El Niño Southern Oscillation (ENSO)
- A climate phenomenon involving periodic warming (El Niño) and cooling (La Niña) of the central Pacific Ocean, disrupting global weather patterns. For India, El Niño correlates with weakened monsoons, affecting agriculture, water availability, and GDP growth—critical for GS1 (Geography) and GS3 (Environment).
Practice question
Discuss the implications of a below-normal monsoon forecast due to ENSO on India's water security and agricultural economy. Suggest measures to mitigate these challenges, drawing from traditional and modern water management practices. (250 words, 15 marks)
GS3 15 marks 250 words Mains
Key terms to include: El Niño Southern Oscillation (ENSO) Indian Ocean Dipole (IOD) Circular Water Economy Temple Tanks Rainwater Harvesting Public-Private Partnership (PPP) National Water Policy Climate-resilient Agriculture
Answer framework
Introduction
Briefly introduce the ENSO phenomenon and its impact on India's monsoon. Highlight the interconnectedness of water security and agricultural economy.
Impact on Water Security
Reduced rainfall leading to water scarcity in rain-fed regions.
Increased pressure on groundwater resources due to over-extraction.
Inefficient water reuse systems (only 3% treated wastewater reused).
Impact on Agricultural Economy
60% of farmland is rain-fed, making it vulnerable to monsoon variability.
Potential decline in crop yields affecting food security and rural incomes.
Increased risk of droughts and floods disrupting agricultural cycles.
Traditional Water Management Practices
Revival of temple tanks and bunds for rainwater harvesting.
Integration of ancient systems with modern urban planning.
Modern Mitigation Measures
Scaling up wastewater treatment and reuse via PPP models (e.g., Surat, Thane).
Mandatory rainwater harvesting in urban and rural areas.
Updating National Water Policy to include climate-resilient strategies.
Conclusion
Emphasize the need for a balanced approach combining traditional wisdom with modern technology. Advocate for policy reforms and community participation to ensure sustainable water management.
Fact check
All facts verified
Water Reuse Statistics: India currently reuses only 3% of treated wastewater, starkly lower than Singapore's 40%
The source text confirms India reuses only 3% of treated used water, while Singapore meets 40% of their water demand through reuse. Severity: none
The book 'Water, Nature and Progress' proposes a PPP framework for water reuse, drawing from Surat and Thane's models
The source text mentions the book 'Water, Nature and Progress: Solutions for a New India' and its proposal for a circular water-economy mission with a framework for public-private partnerships drawing on successful models from Surat, Thane, Taiwan, and Jordan. Severity: none
Implement mandatory rainwater harvesting in urban planning, scale up wastewater treatment to 50% capacity by 2028 via PPPs
The source text mentions the mission proposes staggered targets — 50% treatment capacity by 2028, 100% by 2035, 50% reuse by 2035 — along with a framework for public-private partnerships. Severity: none