Chennai Becomes First City to Launch Real-Time Flood Forecasting System

In a major step toward strengthening urban disaster management, Chennai has become the first Indian city to fully implement a Real-Time Flood Forecasting and Spatial Decision Support System (RTFF & SDSS). Operational since October 2025, this system significantly enhances Chennai’s capability to predict, manage, and respond to urban floods, marking a milestone in climate resilience infrastructure. This initiative is particularly significant as Chennai is frequently affected by seasonal monsoon flooding, and accurate forecasting can save lives, minimize damage, and support smarter urban planning.

What Is RTFF & SDSS?

The Real-Time Flood Forecasting and Spatial Decision Support System (RTFF & SDSS) is an advanced technological system that integrates real-time data to monitor and predict flood events.

Key components include,

• Automatic Rain Gauges (ARGs)
• Automatic Weather Stations (AWS)
• Automatic Water Level Recorders (AWLRs)
• Gate Sensors (GS)

These tools collect high-resolution hydrometeorological data to inform decision-makers and local authorities.

Coverage and Geographic Scope

The system covers 4,974 sq km, including Chennai city and its surrounding districts. It focuses on important river sub-basins such as,

• Adyar River
• Cooum River
• Kosasthalaiyar River
• Kovalam River

This wide coverage allows authorities to identify vulnerable zones, forecast rainfall impacts, and take timely action.

Implementation and Funding

The RTFF & SDSS project was funded by the World Bank under the Project Development Grant Fund (PDGF) and implemented by Tamil Nadu Urban Infrastructure Financial Services Limited (TNUIFSL).

It was developed in collaboration with,

• SECON Private Limited
• JBA Consulting (UK)
• The Indian Institute of Technology Madras (IIT-M) played a supervisory role, ensuring scientific integrity and technological robustness.

Operational Infrastructure and Management

The system is monitored and controlled via a central Hydro Modelling Control Room (HMCR) in Chennai. For on-ground flood response, Regional Control and Command Centres (RCCCs) have been set up in,

• Royapuram
• Anna Nagar
• Adyar

These centres use CCTV cameras, flood and rain sensors, and water level meters to enable real-time situational awareness and localized response strategies.