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Flash Floods in India: Causes, Consequences & Mitigation Strategies

Home   »  Flash Floods in India: Causes, Consequences & Mitigation Strategies

August 2, 2025

Flash Floods in India: Causes, Consequences & Mitigation Strategies

Flash Floods in India – Growing Threat

Why in the News?

  • Researchers at IIT Gandhinagar have recently warned that flash floods are becoming more frequent and severe across India.

Relevance for UPSC

  • Prelims: Flash Floods, Disaster Management, Climate Change
  • Mains:
    • GS1 (Geography): Causes, Impacts, and Regional Vulnerabilities
    • GS3 (Disaster Management, Climate Change): Mitigation & Adaptation

What are Flash Floods?

  • Definition: Sudden, intense flood events that usually occur within six hours of heavy rainfall.
  • Key Conditions:
    • Steep slopes
    • Poor or encroached drainage systems
    • Saturated or extremely dry soil
  • Unique Feature: Unlike riverine floods, flash floods provide little or no warning, making them highly dangerous.

Impacts of Flash Floods in India

  1. Human & Livelihood Impact
  • Cause loss of life, injuries, and mass displacement.
  • For instance, the 2023 flash floods in Himachal Pradesh led to over 400 fatalities and displaced thousands of people.
  1. Damage to Public Infrastructure
  • Severe impact on power lines, telecom, drinking water systems.
  • Results in delayed recovery & high economic cost.
  1. Land & Environment Degradation
  • Topsoil erosion reduces fertility.
  • Sedimentation in rivers/reservoirs affects water storage & quality.
  1. Urban Challenges
  • Cities like Mumbai, Bengaluru, Hyderabad highly vulnerable due to:
    • Concretization of land
    • Encroached stormwater drains
    • Poor drainage & planning

Government Initiatives to Manage Flash Floods

  1. Central Water Commission (CWC)
    • Nodal agency for flood forecasting & early warning.
  2. Flash Flood Guidance System (FFGS)
    • Developed by IMD + US National Weather Service.
    • Provides real-time flash flood alerts across South Asia.
  3. National Initiative for Reducing Risks from Glacial Lake Outburst Floods (NGRMP)
    • Implemented in Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh.
    • Budget: ₹150 crore.
    • Focus: Reduce flood risk from glacial lakes in Himalayas.

Recommendations & Adaptation Strategies

  1. Flash Flood Forecasting
  • Integrate terrain, drainage & soil data with real-time weather.
  • Regional customization for better accuracy.
  1. Early Warning Systems
  • Region-specific flood models considering topography & soil moisture.
  • Promote community-based alert systems in vulnerable districts.
  1. Land Use & Urban Planning
  • Restrict construction in floodplains & steep slopes.
  • Develop climate-resilient infrastructure:
    • Elevated roads
    • Permeable pavements
    • Efficient stormwater drainage
  1. Disaster Preparedness
  • Regularly update flood-risk maps.
  • Conduct mock drills in urban & rural regions.
  1. Climate Adaptation in Policy
  • Integrate climate models into disaster management.
  • Encourage nature-based solutions:
    • Wetland conservation
    • Afforestation
    • Catchment restoration

फ़्लैश फ़्लड्स (अचानक बाढ़) – भारत में बढ़ता ख़तरा

समाचार में क्यों?

  • आईआईटी गांधीनगर के शोधकर्ताओं ने चेतावनी दी है कि भारत में फ्लैश फ्लड्स की घटनाएँ अधिक बार और अधिक तीव्र हो रही हैं।

परीक्षा में प्रासंगिकता

  • प्रीलिम्स: फ्लैश फ्लड्स, आपदा प्रबंधन
  • मुख्य परीक्षा (GS1 – भूगोल, GS3 – आपदा प्रबंधन/जलवायु परिवर्तन)

फ्लैश फ्लड्स क्या होती हैं?

  • अचानक और तीव्र बाढ़ की घटनाएँ जो आमतौर पर भारी वर्षा के छह घंटों के भीतर होती हैं।
  • होती हैं जहाँ:
    • तीव्र ढलान हों
    • जल निकासी कमजोर हो
    • मिट्टी अत्यधिक सूखी या संतृप्त हो
  • इनकी कोई अग्रिम चेतावनी नहीं होती, इसलिए ये और खतरनाक हैं।

भारत में प्रभाव

  1. मानव और आजीविका पर असर – जानमाल की हानि, विस्थापन
    • उदाहरण: 2023 हिमाचल प्रदेश → 400+ मौतें
  2. अवसंरचना को क्षति – बिजली, मोबाइल, पेयजल ठप
  3. भूमि क्षरण – उपजाऊ मिट्टी का क्षरण, गाद जमाव
  4. शहरी समस्याएँ – मुंबई, हैदराबाद और बेंगलुरु में अतिक्रमण तथा कंक्रीट सतहों की अधिकता से बढ़ती संवेदनशीलता।

सरकारी पहलें

  • CWC – बाढ़ पूर्वानुमान और चेतावनी
  • FFGS – आईएमडी + US सहयोग, वास्तविक समय चेतावनी
  • NGRMP – हिमालयी राज्यों में झील विस्फोट बाढ़ जोखिम न्यूनीकरण (₹150 करोड़ बजट)

सिफ़ारिशें व रणनीतियाँ

  • पूर्वानुमान सुधार – भू-आकृति, मिट्टी, जल निकासी + मौसम डेटा
  • प्रारंभिक चेतावनी – स्थानीय मॉडल, सामुदायिक अलर्ट
  • भूमि उपयोग व शहरी नियोजन – जोखिम क्षेत्रों में निर्माण प्रतिबंध, जलवायु-लचीला अवसंरचना
  • आपदा तैयारी – जोखिम नक्शे, मॉक ड्रिल्स
  • नीति में जलवायु अनुकूलन – वनीकरण, आर्द्रभूमि संरक्षण, कैचमेंट पुनर्स्थापन

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