Physical infrastructure for disasters

Communication networks, physical infrastructure and accessible health systems are treated as essential parts of the infrastructure needed during emergency response, focusing on the early warning phase, and carrying through response and recovery. Since all parts of the infrastructure should be operational to a certain level, the aggregation process uses the arithmetic average of indicators describing accessibility as well as the redundancy of the concerned system that are two crucial characteristics in a crisis situation. Physical infrastructure component is the arithmetic average of road density, access to improved water sources and access to improved sanitation facilities.