Natural calamities are very unpredictable. The science and techniques adopted to prevent loss of life and property is known as disaster management.
During floods, when the excessive water rushes into the villages or towns, turning them into ruins, we have a trained team of people who reach the affected area in time and save them. People are evacuated from their homes and taken to higher places of safety. Even the animals are taken care of. Later the damaged roads and homes are repaired to bring back life to normalcy. Even doctors are made available to help prevent any kind of waterborne epidemics.
During earthquakes, such teams are trained to shift the needy to a safer place. Help remove any person trapped beneath the rubble. Temporary shelter, food, medicines are provided. Sometimes the entire village or town need to be renovated and they use scientific methods of construction in these earthquake-prone regions.
Every government should have a special department in every state to cope up with such situations.