What is a prolonged drought and why is it so concerning?
A prolonged drought is an abnormally dry period that extends for months or even years, exceeding the typical climatic variability of a region. Unlike a simple lack of seasonal rain, these droughts have cumulative effects on soil, aquifers, ecosystems, and the economy.
In South America, phenomena such as El Niño and La Niña have intensified the frequency and intensity of these events. Countries like Argentina, Chile, Brazil, and Uruguay have faced historic droughts in the last decade, with millions in losses in agriculture, energy generation, and drinking water supply.
Impacts of prolonged droughts
Agricultural and livestock impact
Agriculture is the most vulnerable sector. Lack of water reduces yields of crops such as soybeans, corn, wheat, and rice, and affects the availability of pastures for livestock. In Argentina, for example, the 2022-2023 drought caused losses of over 20 billion dollars, according to estimates from the Rosario Board of Trade.
- Lower production and increased food prices.
- Water stress in animals and reduced milk and meat production.
- Increased pests and diseases due to ecological imbalance.
Impact on water supply
Prolonged droughts deplete rivers, lakes, and reservoirs, affecting human consumption, industry, and hydroelectric power generation. In Brazil, the 2021 drought in the central-south region reduced dam levels to historic lows, forcing rationing and the activation of more expensive and polluting thermal power plants.
Environmental and social impact
Ecosystems suffer biodiversity loss, and the risk of forest fires increases. In Chile, the mega-drought that began in 2010 has left rural communities without water, causing migration and conflicts over the resource.
Adaptation strategies for prolonged droughts
1. Efficient water management
The key is to optimize the use of available water. Implementing drip irrigation or low-pressure sprinkler systems reduces consumption by up to 60% compared to flood irrigation. Additionally, rainwater harvesting from roofs and the construction of small reservoirs help store water for critical periods.
2. Crop diversification and rotation
Farmers can adapt by planting drought-resistant varieties, such as sorghum or quinoa, and rotating crops to maintain soil health. Agrobiodiversity is a natural insurance against total crop loss.
3. Use of agricultural insurance
Parametric insurance based on climate indices (such as precipitation or soil moisture) is a financial tool that allows producers to receive quick compensation without the need for field inspections. In Uruguay, pilot schemes have already been implemented with good results.
4. Monitoring and early warning
Having real-time climate monitoring systems is essential. The Contingencias app offers personalized drought alerts and other phenomena, helping users make early decisions. With data from satellites and weather stations, the intensity and duration of a dry event can be predicted.
5. Public policies and regional cooperation
Governments must invest in water infrastructure, such as desalination plants and aqueducts, and promote the reuse of treated wastewater. Cooperation among South American countries is essential to manage transboundary basins, such as the Paraná River, which supplies several nations.
Examples of successful adaptation
In northeastern Brazil, the 'Cisternas' program has installed more than one million tanks to store rainwater, benefiting rural families and reducing dependence on water trucks.
In Chile, farmers in the Coquimbo region have adopted drip irrigation and the use of renewable energy to pump water from wells, managing to maintain their grape and olive crops despite the drought.
The role of technology and community
Mobile apps and digital platforms allow farmers to access local forecasts, irrigation recommendations, and forums for sharing experiences. The community also plays a vital role: the creation of local water management committees facilitates equitable distribution and conflict resolution.
Conclusion: Adaptation is a continuous process
Prolonged droughts are an increasingly frequent challenge, but we are not defenseless. The combination of technology, planning, and cooperation can mitigate their impacts and increase the resilience of communities and ecosystems.
If you live in a drought-prone area, we recommend:
- Install rainwater harvesting systems.
- Maintain vegetation cover on your land to retain moisture.
- Download the Contingencias app to receive early alerts and practical tips.
Prevention and adaptation are the best investment for facing an uncertain climate future. Share this article to raise awareness in your community!