Understanding Droughts: Causes, Impacts and Consequences

Understanding Droughts

It is necessary to distinguish between aridity and drought. Aridity is a permanent condition; societies living in deserts have adapted to it by constructing infrastructure to manage water needs. By contrast, drought is an occasional or sporadic phenomenon that results in disaster.

Unlike other natural disasters, droughts tend to be long-lasting and widespread, resulting in significant long-term damage. The consequences affect all aspects of life, including:

• Water scarcity: Lack of drinking water, reduced flow in rivers and streams, and groundwater depletion.
• Social displacement: Overcrowding in cities and rural exodus caused by livestock deaths and hunger due to lack of pasture.
• Environmental degradation: Wind erosion stripping away fertile topsoil.
• Economic crisis: Livestock devaluation due to poor health and market instability.

Secondary Impacts and Vulnerabilities

Furthermore, the resulting weakness in populations makes them more vulnerable to epidemics. Food prices rise as crops are lost, and the frequency of wildfires increases due to rising temperatures and aridity.

One of the most significant droughts occurred in the Sahel (Africa) between 1969 and 1973. It affected the southern Sahara Desert, causing the desert to expand into Mauritania, Senegal, Mali, Burkina Faso, and Chad. More than 200,000 people died of hunger, and most farmers were forced to migrate following the total loss of crops and livestock.

Defining Drought and Water Scarcity

Drought can be defined as a transient abnormality in which water availability falls below the statistical requirements of a given geographical area. Water becomes insufficient to meet the needs of plants, animals, and humans.

If the phenomenon is linked to the level of human and industrial demand for water in the area, it is classified as water scarcity. The primary cause of any drought is a lack of precipitation. If dry weather persists, it leads to a hydrological drought, characterized by an imbalance between natural water availability and demand. In extreme cases, this can lead to total dryness.