Category: Health Articles
Written By: Web Administrator
Drought is a natural phenomenon in which rainfall is lower than average for an extended period of time, resulting in inadequate water supply. Drought is generally categorized as a hydro-meteorological hazard even though there are terms of other typologies of droughts as such as meteorological drought, agricultural drought, hydrological drought, and socio-economic drought. A drought as a hazard does not automatically lead to disaster. Only when people who are unable to cope with its effects; it becomes a disaster. Drought can therefore lead to public health problems.
In Fiji almost all droughts have been associated with the El Nino phenomena. The El Nino years in the past century include; 1902, 1905, 1911-1915, 1918, 1923, 1925-1926, 1930, 1932, 1939-1941, 1951, 1957, 1965, 1969, 1972, 1976, 1982, 1987, 1991-1995, 1997 and 2002.
The September 1997 – 1998 drought reached a level, which had warranted the declaration of a national emergency and this was noted to be the worst drought to affect Fiji for the century. It is estimated that approximately 48,000 households (about 220,000 people) were affected directly in various parts of the country.
Drought can affect areas or communities differently depending on several additional variables. These variables include:
- the structure and capacity of existing water systems,
- local governance of water use,
- economic development,
- the at-risk populations living within the affected area, and
- other societal factors, such as the presence of local social networks
Public Health Implications
The possible public health implications of drought include:
- Compromised quantity and quality of drinking water;
- Increased recreational risks;
- Effects on air quality;
- Diminished living conditions related to energy, air quality, and sanitation and hygiene;
- Compromised food and nutrition; and
- Increased incidence of illness and disease.
The health implications of drought are numerous and far reaching. Some drought-related health effects are experienced in the short-term and can be directly observed and measured. However, the slow rise or chronic nature of drought can result in longer term, indirect health implications that are not always easy to anticipate or monitor.
Health Implications of Drought
Drought poses many and far reaching health implications. Some drought-related health effects occur in the short-term and can be directly observed and measured. But the slow rise or chronic nature of drought also can result in longer term, indirect health implications that are not always easy to anticipate or monitor.
Health Implications of Drought: Water
Reduced stream and river flows can increase the concentration of pollutants in water and cause stagnation. Higher water temperatures in lakes and reservoirs lead to reduced oxygen levels. These levels can affect fish and other aquatic life and water quality.
Runoff from drought-related wildfires can carry extra sediment, ash, charcoal, and woody debris to surface waters, killing fish and other aquatic life by decreasing oxygen levels in the water. Many parts of Fiji depend on groundwater as a primary source of water. Over time, reduced precipitation and increased evaporation of surface water mean that groundwater supplies are not replenished at a typical rate.
Health Implications of Drought: Food and Nutrition
Drought can limit the growing season and create conditions that encourage insect and disease infestation in certain crops. Low crop yields can result in rising food prices and shortages, potentially leading to malnutrition.
Special emphasis on responding to the nutrition needs of infants and young children, as well as pregnant and lactating women must be a priority; and that responses during a drought must be designed to achieve longer-term nutrition needs.
Drought can also affect the health of livestock raised for food. During drought, livestock can become malnourished, diseased, and die.
Health Implications of Drought: Air Quality
The dusty, dry conditions and wildfires that often accompany drought can harm health. Fire and dry soil and vegetation increase the number of particulates that are suspended in the air, such as pollen, smoke, and fluorocarbons. These substances can irritate the bronchial passages and lungs, making chronic respiratory illnesses like asthma worse. This can also increase the risk for acute respiratory infections like bronchitis and bacterial pneumonia.
Other drought-related factors affect air quality, including the presence of airborne toxins originating from freshwater blooms of cyanobacteria. These toxins can become airborne and have been associated with lung irritation, which can lead to adverse health effects in certain populations.
Health Implications of Drought: Sanitation and Hygiene
Having water available for cleaning, sanitation, and hygiene reduces or controls many diseases. Drought conditions create the need to conserve water, but these conservation efforts should not get in the way of proper sanitation and hygiene.
Personal hygiene, cleaning, hand washing, and washing of fruits and vegetables can be done in a way that conserves water and also reduces health risks. Installing low-flow faucet aerators in businesses and homes is one example of how to reduce water consumption while maintaining hand washing and other healthy hygienic behaviours.
Health Implications of Drought: Recreational Risk
People who engage in water-related recreational activities during drought may be at increased risk for waterborne disease caused by bacteria, protozoa, and other contaminants such as chemicals and heavy metals. Exposure can occur through accidentally or intentionally swallowing water, direct contact of contaminants with mucous membranes, or breathing in contaminants.
Untreated surface water can be a health threat in drought conditions. In untreated surface waters, some pathogens, such as a type of amoeba (Naegleriafowleri), are more common during drought because low water levels may create warmer water temperatures that encourage their growth.
As the levels of surface waters used for boating, swimming, and fishing drop, the likelihood of injury increases. Low water levels in lakes can put people at risk for life-threatening injuries resulting from diving into shallow waters or striking objects that may not be immediately visible while boating. Low surface water levels can also expose potentially dangerous debris from the bottom of lakes, rivers, and ponds.
Health Implications of Drought: Infectious Disease
Increases in infectious disease can be a direct consequence of drought.
- Viruses, protozoa, and bacteria can pollute both groundwater and surface water when rainfall decreases. People who get their drinking water from private wells may be at higher risk for drought-related infectious disease. Other groups also at increased risk include those who have underlying chronic conditions.
- Acute respiratory and gastrointestinal illnesses are more easily spread from person to person when hand washing is compromised by a perceived or real lack of available water. During water shortages, the risk for infectious disease increases when hygiene is not maintained.
- E. coli and Salmonella are examples of bacteria that during drought can more readily contaminate food and cause infectious disease. Food can serve as a vehicle for disease transmission during a drought because water shortages can cause farmers to use recycled water to irrigate their fields and process the food they grow. When used to grow crops, improperly treated water can cause a host of infectious diseases (such as those caused by toxin-producing E. coli and Salmonella), which can be life-threatening for people in high-risk groups. In addition, the likelihood of surface runoff, which can occur when rain fails to penetrate the dry and compacted soil that often accompanies drought, can cause the inadvertent contamination of crops.
- Other infectious disease threats arise when drought leads to the contamination of surface waters and other types of water that are used for recreational purposes. When temperatures rise and rainfall declines, people are more likely to participate in water-related recreation. Persons exposed to contaminated recreational waters are more likely to become infected with pathogens that thrive in the shallow warm waters that exist during drought conditions.
Health Implications of Drought: Chronic Disease
Conditions associated with drought may negatively impact people who have certain chronic health conditions such as asthma and some immune disorders.
Drought-related changes in air quality, such as increased concentrations of air particulates and airborne toxins resulting from freshwater algal blooms, can irritate the eyes, lungs, and respiratory systems of persons with chronic respiratory conditions.
Changes in water quality, such as increased concentrations of contaminants, can threaten persons whose immune systems are compromised.
Health Implications of Drought: Diseases Transmitted by Insects and Animals
In periods of limited rainfall, both human and animal behaviour can change in ways that increase the likelihood of other vector borne diseases. For instance, during dry periods, wild animals are more likely to seek water in areas where humans live. These behaviours increase the likelihood of human contact with wildlife, the insects they host, and the diseases they carry.
Drought reduces the size of water bodies and causes them to become stagnant. This provides additional breeding grounds for certain types of mosquitoes. Inadequate water supply can cause people to collect rainwater. This can lead to collections of stagnant water that can become manmade mosquito breeding areas.
Health Implications of Drought: Mental Health and Psychosocial Support
Micronutrient deficiencies (e.g. lack of iron) and poor psychosocial support during periods of disasters such as drought and famine can inhibit cognitive and physical development of children which in turn leads to a life time of intellectual disability. This may be a result of parents being too physically or mentally unwell to care for their young off-springs.
A combination of responsive parenting and the emphasis of the provision of good nutrition is an effective intervention. It is important for health professionals to differentiate the normal psychological stresses of people being affected by disasters. The distress caused by uncertainty and fear burdens people of all ages and as such the provision of Psychological First Aid and Psychosocial support is important.
- Centers for Disease Control and Prevention, U.S. Environmental Protection Agency, National Oceanic and Atmospheric Agency, and American Water Works Association. 2010. When every drop counts: protecting public health during drought conditions— a guide for public health professionals. Atlanta: U.S. Department of Health and Human Services
- Information Sheet No 126/2003, List of Droughts in Fiji from 1965 – 2000, Climate Division, Fiji Met Office
- Public Health Risk Assessment and Interventions: The Horn of Africa Drought and Famine Crisis July 2011
- UNISDR, 2009. Drought Risk Reduction Framework and Practices: Contributing to the Implementation of the Hyogo Framework for Action. United Nations secretariat of the International Strategy for Disaster Reduction (UNISDR), Geneva, Switzerland, 213 pp.