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essay on prevention and mitigation of natural disasters

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Answered by rowina
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Sudden-onset natural and technological disasters impose a substantial health burden, either directly on the population or indirectly on the capacity of the health services to address primary health care needs. The relationship between communicable diseases and disasters merits special attention. This chapter does not address epidemics of emerging or reemerging diseases, chronic degradation of the environment, progressive climatic change, or health problems associated with famine and temporary settlements.

In line with the definition of healthadopted in the constitution of the World Health Organization (WHO), the chapter treats disasters as a health condition or risk, which, as any other "disease," should be the subject of epidemiological analysis, systematic control, and prevention, rather than merely as an emergency medicine or humanitarian matter. The chapter stresses the interdependency between long-term sustainable development and catastrophic events, leading to the conclusion that neither can be addressed in isolation.

Disasters as a Public Health Condition

According to the International Federation of Red Cross and Red Crescent Societies, internationally reported disasters in 2002 affected 608 million people worldwide and killed 24,532—well below the preceding decade's annual average mortality of 62,000 (IFRC 2003). Many more were affected by myriad local disasters that escaped international notice.


Disaster has multiple and changing definitions. The essential common element of those definitions is that disasters are unusual public health events that overwhelm the coping capacity of the affected community. This concept precludes the universal adoption of a threshold number of casualties or victims. What would be a minor incident in a large country may constitute a major disaster in a small isolated island state. Not only are "quantitative definitions of disasters unworkably simplistic" as noted by Alexander (1997, 289), but when based on the economic toll or the number of deaths, they are also misleading with regard to the immediate health needs of the survivors or their long-term impact on the affected country.

Classification of Disasters

In the early 1970s, a series of well-publicized disasters (the civil war and resulting famine in Biafra, the cyclone in Bangladesh, and the earthquake in Peru) triggered the scientific interest of the international public health community.

Disasters can be classified as natural disasters, technological disasters, or complex emergencies. The latter include civil wars and conflicts. These classifications are arbitrary and refer to the immediate trigger—a natural phenomenon or hazard (biological, geological, or climatic); a technologically originated problem; or a conflict. In reality, all disasters are complex events stemming from the interaction of external phenomena and the vulnerability of man and society.

The human responsibility in so-called natural disasters is well acknowledged. The term natural disaster remains commonly used and should not be understood as denying a major human responsibility for the consequences.

Disaster Terminology

The following definitions are adapted from those proposed by the Secretariat of the International Strategy for Disaster Reduction (ISDR), a United Nations (UN) body established to sustain the efforts of the International Decade for Natural Disaster Reduction (UN/ISDR 2004) and the WHO World Health Report 2002 (WHO 2002):

Hazards are potentially damaging physical events, which may cause loss of life, injury, or property damage. Each hazard is characterized by its location, intensity, frequency, and probability.

Vulnerability is a set of conditions resulting from physical, social, economic, and environmental factors that increase the susceptibility of a community to the effects of hazards. A strong coping capacity—that is, the combination of all the strengths and resources available within a community—will reduce its vulnerability.

Risk is the probability of harmful consequences (health burden) or economic losses resulting from the interactions between natural or human-induced hazards and vulnerable or capable conditions. In a simplified manner, risk is expressed by the following function:


A public health approach to disaster risk management will aim to decrease the vulnerability by adopting prevention and mitigation measures to reduce the physical impact and to increase the coping capacity and preparedness of the health sector and community, in addition to providing traditional emergency care (response) once the disaster has occurred.



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