Chennai became the first city in India to fully operationalise a Real-Time Flood Forecasting and Spatial Decision Support System (RTFF & SDSS), effective October 2025. The system, costing approximately ₹107.2 crore, was developed with World Bank support and is managed by TNUIFSL. It covers a 4,974 sq km area across Chennai, Tiruvallur, Kancheepuram, Chengalpattu, Ranipet, and Vellore districts. The system integrates real-time data from lakes, rivers, storm drains, and coastal areas to generate street-level inundation forecasts for high-risk zones including Velachery, Nungambakkam, and Mambalam. Public alerts are disseminated via the TN-Alert mobile app. The four monitored river sub-basins are Adyar, Cooum, Kosasthalaiyar, and Kovalam.
Chennai Operationalises India's First Real-Time Flood Forecasting and Spatial Decision Support System
AQuick answer
Chennai became the first city in India to fully operationalise a Real-Time Flood Forecasting and Spatial Decision Support System (RTFF & SDSS), effective October 2025. The system, costing approximately ₹107.2 crore, was developed with World Bank support and is managed by TNUIFSL. It covers a 4,974 sq km area across Chennai, Tiruvallur, Kancheepuram, Chengalpattu, Ranipet, and Vellore districts. The system integrates real-time data from lakes, rivers, storm drains, and coastal areas to generate street-level inundation forecasts for high-risk zones including Velachery, Nungambakkam, and Mambalam. Public alerts are disseminated via the TN-Alert mobile app. The four monitored river sub-basins are Adyar, Cooum, Kosasthalaiyar, and Kovalam.
Key facts
- Chennai became India's first city to operationalise a Real-Time Flood Forecasting and Spatial Decision Support System.
- The system covers 4,974 sq km across Chennai, Tiruvallur, Kancheepuram, Chengalpattu and Ranipet districts.
- Developed with World Bank support at a cost of approximately ₹107.2 crore, managed by TNUIFSL.
- The system generates street-level inundation forecasts for high-risk zones like Velachery and Nungambakkam.
- Public alerts are disseminated via the TN-Alert mobile app to citizens.
- Four monitored river sub-basins are Adyar, Cooum, Kosasthalaiyar and Kovalam.
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Chennai's RTFF & SDSS system monitors which four river sub-basins?
Explanation · Correct answer B
The four monitored river sub-basins are Adyar, Cooum, Kosasthalaiyar, and Kovalam. The system covers 4,974 sq km across Chennai, Tiruvallur, Kancheepuram, Chengalpattu, and Ranipet districts, generating street-level inundation forecasts for high-risk zones including Velachery, Nungambakkam, and Mambalam.
Source: The Daily Jagran
Frequently asked questions
What is the RTFF & SDSS system operationalised in Chennai and what is its geographic coverage?
The Real-Time Flood Forecasting and Spatial Decision Support System (RTFF & SDSS) is India's first city-level real-time flood forecasting platform, operationalised in Chennai from October 2025. It covers 4,974 sq km across five districts: Chennai, Tiruvallur, Kancheepuram, Chengalpattu, and Ranipet. The system integrates live data from lakes, rivers, storm drains, and coastal areas to produce street-level inundation forecasts.
Who developed and manages Chennai's flood forecasting system and what was the total cost?
Chennai's RTFF & SDSS was developed with World Bank financial support at a total cost of approximately ₹107.2 crore. It is managed by TNUIFSL — the Tamil Nadu Urban Infrastructure Financial Services Limited — under the state government. World Bank support was provided under its broader urban resilience and disaster risk reduction framework.
What four river sub-basins are monitored by Chennai's flood forecasting system?
Chennai's RTFF & SDSS monitors four river sub-basins: Adyar, Cooum, Kosasthalaiyar, and Kovalam. These rivers drain into the Bay of Bengal and are prone to flooding during northeast monsoon events. The system tracks water levels at key gauging stations across these sub-basins to generate early flood warnings.
How does the Chennai RTFF & SDSS disseminate flood alerts to the public?
Flood alerts generated by the RTFF & SDSS are disseminated to citizens through the TN-Alert mobile application. The system generates street-level inundation forecasts, allowing residents in high-risk neighbourhoods like Velachery, Nungambakkam, and Mambalam to receive timely, location-specific warnings before flooding occurs.
Why is Chennai's real-time flood forecasting system significant for urban disaster management in India?
Chennai's catastrophic 2015 floods, which caused over 500 deaths and economic losses exceeding ₹20,000 crore, exposed critical gaps in urban flood preparedness. The RTFF & SDSS is India's first operational real-time city-level flood forecasting system, serving as a scalable model for other flood-prone Indian cities. It represents a shift from reactive flood relief to proactive flood risk governance using spatial data and AI-driven forecasting.
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