JNTU B.Tech III DISASTER MANAGEMENT Previous Question Paper (November/December - 2020 - R16)

India is highly vulnerable to various natural disasters due to its unique geo-climatic conditions. These disasters are broadly classified based on their origin and impact.

1. Floods: The most frequent disaster in India, primarily affecting the Indo-Gangetic plains. Causes include heavy monsoon rainfall, cloudbursts, and poor drainage. Effects include loss of life, destruction of standing crops, damage to infrastructure, and the spread of waterborne diseases.

2. Cyclones: India has a long coastline, making it prone to tropical cyclones, especially in the Bay of Bengal and the Arabian Sea. Effects involve high-velocity winds, storm surges, and torrential rains, leading to severe coastal erosion, destruction of housing, and disruption of power and communication networks.

3. Earthquakes: India is divided into seismic zones II to V, with the Himalayan region being the most active. Effects include the collapse of buildings, landslides, and potential tsunamis if the epicenter is offshore. The economic impact is massive due to the sudden destruction of urban centers.

4. Droughts: Occurring frequently in arid and semi-arid regions like Rajasthan, Gujarat, and parts of the Deccan plateau. Effects include severe water scarcity, crop failure, livestock death, and long-term food insecurity, often leading to migration and economic distress.

5. Landslides: Common in the Himalayan ranges and the Western Ghats, often triggered by heavy rainfall or seismic activity. Effects include the blockage of transport routes, destruction of mountain settlements, and loss of forest cover.

The cumulative effect of these disasters is a significant setback to the national economy, diverting funds from developmental projects to relief and rehabilitation. They exacerbate poverty, displace large populations, and cause long-term psychological trauma to affected communities.

The National Disaster Management Authority (NDMA) in India coordinates with various nodal agencies to maintain a multi-layered Early Warning System (EWS) designed to provide timely alerts to vulnerable populations. The system integrates scientific monitoring, communication infrastructure, and community-level dissemination.

Key components of the early warning systems include:

• Meteorological Forecasting: The India Meteorological Department (IMD) operates a network of Doppler Weather Radars, automatic weather stations, and satellite imagery (INSAT series) to monitor cyclonic disturbances, heavy rainfall, and heatwaves.
• Flood Monitoring: The Central Water Commission (CWC) manages a vast network of hydrological observation stations across major river basins to provide flood forecasts and inflow predictions for dams.
• Seismic Monitoring: The National Centre for Seismology (NCS) maintains a national network of seismic stations to detect earthquakes and provide real-time data to national and state disaster management authorities.
• Tsunami Early Warning: The Indian National Centre for Ocean Information Services (INCOIS) operates the Indian Tsunami Early Warning Centre, which uses deep-ocean pressure sensors and coastal tide gauges to detect tsunamis in the Indian Ocean.
• Communication Infrastructure: The NDMA utilizes the National Disaster Communication Network (NDCN), which includes satellite-based communication (VSAT), high-frequency radio systems, and the Common Alerting Protocol (CAP) to ensure that warnings reach remote areas even when terrestrial networks fail.
• Dissemination Mechanisms: Warnings are cascaded from the national level to State Disaster Management Authorities (SDMAs) and District Disaster Management Authorities (DDMAs). Local dissemination occurs through mass media, SMS alerts, community radio, and the use of sirens in coastal areas.

The effectiveness of these systems is supported by the National Cyclone Risk Mitigation Project (NCRMP), which focuses on strengthening the last-mile connectivity of warnings to ensure that information reaches the most vulnerable communities in time for evacuation and mitigation actions.