The disaster management system in India is managed by the National Disaster Management Authority (NDMA) and State Disaster Management Authorities (SDMAs). Here are the key points of the system and its effectiveness in handling natural calamities:

• The system has a four-tiered approach: prevention, mitigation, preparedness, and response.
• The NDMA and SDMAs regularly conduct training programs and mock drills for various stakeholders and the public to create awareness and preparedness.
• The NDMA and SDMAs use various communication channels like helplines, social media, and dissemination of information to alert people in the affected areas.
• The National Disaster Response Force (NDRF) is a specialized force created for quick response in rescue, relief, and rehabilitation operations.
• The system has been effective in handling multiple natural calamities like floods, earthquakes, and cyclones. For instance, during the 2018 Kerala floods, the coordinated efforts of multiple agencies under the disaster management system helped in minimizing casualties and damage.

Overall, the disaster management system in India has been robust and effective in handling natural calamities, though there is always room for improvement.