The Disaster Management Act, 2005 is a comprehensive law that provides for effective management of disasters in India. Here are some ways in which it is helpful during natural calamities:

• It provides a legal framework for disaster management in India, which includes disaster preparation, response, and mitigation measures.
• It establishes National Disaster Management Authority, State Disaster Management Authority and District Disaster Management Authority for the purpose of managing disasters effectively.
• The Act empowers these authorities to take necessary measures for disaster management, such as preparation of plans, implementation of measures, and coordination between various agencies.
• It also provides for the establishment of a National Disaster Response Fund and State Disaster Response Fund for providing financial assistance during natural disasters.
• The Act also includes provisions for compensation and rehabilitation of disaster victims.
• It also lays down penalties for any violation of the Act.
• The Act ensures a coordinated and prompt response during natural disasters, reducing the loss of lives, damage to property, and ensuring quick rehabilitation of affected communities.

In conclusion, the Disaster Management Act, 2005 is a crucial tool in managing natural calamities in India, providing a coordinated and effective response to disasters while minimizing their impact on people and property.