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The Impact of Drought in South Africa: Research Grade 11

• May 12, 2023

South Africa is a country that is susceptible to drought due to its semi-arid climate, which makes it vulnerable to the effects of climate variability and change. Drought has significant impacts on the country’s social, economic, and environmental systems. This research task aims to equip Grade 11 learners with skills in research, analysis, interpretation, and communication. This paper will explore the possible subtopics and questions that learners can explore, the importance of the research memorandum, and how learners can prepare for their exams.

Causes of Drought

Drought is a natural disaster that occurs when there is a shortage of rainfall over an extended period. The first subtopic that learners can explore is the causes of drought . This section aims to provide an understanding of what drought is and the different types of drought. The research task should explain the physical and human causes of drought. Physical causes may include climate variability, while human causes may include deforestation, over-extraction of groundwater, and poor water management practices. Climate change is also a crucial factor that impacts drought, and learners can investigate how climate change exacerbates drought conditions.

To explore the causes of drought, learners can ask the following questions:

• What is drought, and what are the different types of drought?
• How does climate variability contribute to drought?
• What are the human causes of drought, and how do they contribute to the occurrence of drought?
• How does climate change impact drought conditions?

Impacts of Drought

Drought has significant impacts on society, the economy, and the environment. The second subtopic that learners can explore is the impacts of drought . This section should provide an understanding of the social, economic, and environmental impacts of drought. Learners can investigate how different regions and communities experience drought differently, as well as the short-term and long-term effects of drought. The research task should describe the loss of vegetation, soil erosion, and the depletion of water resources. Learners can also investigate how drought affects wildlife and biodiversity.

To explore the impacts of drought, learners can ask the following questions:

• What are the social impacts of drought, and how do they affect communities?
• How does drought affect the economy, and what are the economic impacts of drought?
• How does drought affect the environment, and what are the environmental impacts of drought?
• What are the short-term and long-term effects of drought on communities and ecosystems?

Management Strategies for Drought

Drought management strategies are crucial in mitigating the impacts of drought. The third subtopic that learners can explore is management strategies for drought. This section should provide an understanding of the different drought management strategies used in different regions. Learners can investigate the effectiveness of these strategies and the challenges and limitations of drought management. They can also explore the strategies used to mitigate the impacts of drought, including water conservation, drought-resistant crops, and alternative water sources. The research task can also discuss how communities can adapt to drought and manage water resources more sustainably.

To explore the management strategies for drought, learners can ask the following questions:

• What are the different drought management strategies used in different regions?
• How effective are these strategies, and what are the challenges and limitations of drought management?
• What are the strategies used to mitigate the impacts of drought, and how successful are they?
• How can communities adapt to drought and manage water resources more sustainably?

The Importance of the Research Memorandum

The Geography Grade 11 Research about Drought Memorandum is an essential resource for learners preparing for the Geography Grade 11 research task on drought. It provides a clear guideline on what is expected from the learners and how to approach the research task. Learners can gain insight into the research question, methodology, and requirements for the final report. The memorandum can also provide a clear understanding of the scope of the research task and the subtopics that learners should explore. By carefully reading and following the memorandum, learners can ensure that they meet the requirements of the research task and produce a high-quality report. Additionally, the memorandum can also help learners develop important skills such as critical thinking, research, and communication skills. These skills are not only essential for the research task but also for future academic and professional endeavors. Therefore, it is important for learners to take the memorandum seriously and use it as a tool for success.

In conclusion, the Geography Grade 11 research task on drought provides learners with an opportunity to develop their research, analysis, interpretation, and communication skills. By exploring the causes, impacts, and management strategies for drought, learners can gain a deeper understanding of the complex social, economic, and environmental challenges that arise from drought conditions in South Africa. By preparing for the research task and exam, learners can also develop critical thinking skills and improve their ability to communicate their findings effectively. Ultimately, this research task can help learners become more engaged and informed citizens, capable of addressing the complex challenges facing their communities and the world.

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Understanding Droughts

Drought is an extended period of unusually dry weather when there is not enough rain.

Biology, Ecology, Earth Science, Meteorology, Geography, Human Geography, Physical Geography, Social Studies, U.S. History, World History, Geology

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Drought  is an extended period of unusually dry  weather  when there is not enough rain. The lack of  precipitation  can cause a variety of problems for local communities, including damage to  crops and a shortage of drinking water. These effects can lead to devastating  economic  and social disasters, such as  famine ,  forced migration  away from drought -stricken areas, and  conflict  over remaining  resources .

Because the full effects of a drought can develop slowly over time, impacts can be underestimated. However, drought can have  drastic  and long-term effects on  vegetation , animals, and people. Since 1900, more than 11 million people have died and more than 2 billion people have been affected by drought . Drought is also one of the costliest weather -related disasters. Since 2014 California has lost at least 2 billion-dollars a year, due to drought .

Defining Drought

Drought is a complicated  phenomenon , and can be hard to define. One difficulty is that drought means different things in different regions. A drought is defined depending on the average amount of precipitation that an area is accustomed to receiving.

For example, in Atlanta, Georgia, the average rainfall is about 127 centimeters (50 inches) a year. If  significantly less rain falls, there may be water shortages and a drought may be declared. However, some arid regions, such as the  deserts of the American Southwest, may receive less than about 25 centimeters (10 inches) of rainfall in a non- drought year. A drought in Atlanta could be a very wet period in Phoenix, Arizona!

Determining the start of a drought can be tricky. Unlike many  natural hazards that bring about sudden and dramatic results—such as  earthquakes ,  tornadoes , and  hurricanes —the onset of a drought can be gradual and subtle. It can take weeks, months, or even years for the full effects of long-term  inadequate  rainfall to become apparent.

The end of a drought can also be difficult to determine. While a single rain storm will provide short-term relief from a drought , it might take weeks or months before levels of precipitation return to normal. The start and end of a drought are often only clear in hindsight .

Causes of Drought

Most droughts occur when regular weather patterns are interrupted, causing  disruption to the  water cycle . Changes in  atmospheric circulation  patterns can cause storm tracks to be  stalled for months or years. This disruption can dramatically impact amounts of precipitation that a region normally receives. Changes in wind patterns can also be disruptive to how moisture is absorbed in various regions.

Scientists have found a link between certain  climate  patterns and drought . El Niño is a weather event where the surface water in the Pacific Ocean along the central South American coast rises in temperature. These warmer waters alter storm patterns and are associated with droughts in Indonesia, Australia, and northeastern South America. El Nino events keep climate scientists guessing, by occurring every two to seven years.

La Niña is the counterpart to El Niño , when the surface water in the Pacific Ocean along the coast of South America decreases in temperature. The cooler waters affect storm patterns by contributing to drier-than-normal conditions in parts of North and South America. El Niño and La Niña both usually last about a year. The effects of La Niña on weather patterns are often more  complex  than El Niño . Two of the most devastating droughts in the history of the United States—the 1930s  Dust Bowl  and the 1988 drought in the Midwest—are associated with the effects of La Niña.

There is still a lot of debate about the connection between drought and  global warming , the current period of  climate change . A 2013 NASA study predicts warmer worldwide temperatures will mean increased rainfall in some parts of the world and decreased rainfall in others, leading to both more flooding and more droughts worldwide. Other scientists question the prediction that there will be more droughts and believe global warming will create a wetter climate around the world.

Impacts of Drought

Trees and other plants have adapted to withstand the effects of drought through various survival methods. Some plants (such as grasses) will slow their growth or turn brown to conserve water. Trees can drop their leaves earlier in the season to prevent losing water through the leaf surface. However, if drought conditions persist, much vegetation will die.

Certain plants have adapted so they can withstand long periods without water. Yuccas, for instance, have deep  root systems that can seek out water with incredible efficiency. Cacti have spiny, hairy spines, spikes, or leaves that limit how much water they lose to  evaporation . Mosses can withstand complete  dehydration . Juniper trees can self- prune  by steering water only to ward the branches required for survival. Other plants only grow when there is enough water to support them. In periods of drought , their seeds can survive under the  soil for years until conditions are favorable again.

However, many organisms cannot adapt to drought conditions, and the environmental effects of extended, unusual periods of low precipitation can be  severe . Negative impacts include damage to  habitats , loss of  biodiversity , soil   erosion , and an increased risk from  wildfires . During the U.S. drought of 1988, rainfall in many states was 50 to 85 percent below normal. Summer thunderstorms produced  lightning  without rain and  ignited fires in dry trees. In Yellowstone National Park 36 percent of the park was destroyed by fire.

Drought can also create significant economic and social problems. The lack of rain can result in crop loss, a decrease in land prices, and  unemployment  due to declines in production. As water levels in rivers and lakes fall, water-supply problems can develop. These can bring about other social problems. Many of these problems are health-related, such as lack of water, poor  nutrition , and famine . Other problems include conflicts over water usage and food, and forced migration away from drought -stricken areas.

While drought is a naturally occurring part of the weather cycle and cannot be prevented, human activity can influence the effects that drought has on a region. Many modern agricultural practices may make land more  vulnerable to drought . While new  irrigation  techniques have increased the amount of land that can be used for farming, they have also increased  farmers ’ dependence on water.

Traditional agricultural techniques allow land to “rest” by rotating crops each season and alternating areas where  livestock graze . Now, with many areas in the world struggling with overpopulation and a shortage of farmland, there is often not enough  arable  land to support  sustainable practices. Over-farming and  overgrazing  can lead to soil being  compacted and unable to hold water. As the soil becomes drier, it is vulnerable to erosion . This process can lead to  fertile  land becoming desert -like, a process known as  desertification . The desertification of the  Sahel  in North Africa is partly blamed on a prolonged drought whose effects were intensified by farming practices that result in overgrazing .

Increased drought conditions in Kenya have been attributed to  deforestation and other human activities. Trees help bring precipitation into the ground and prevent soil erosion . But in 2009, it was reported that one-quarter of a protected forest reserve had been cleared for farming and  logging , leading to drought conditions affecting 10 million people around the country.

Historical Droughts

Scientists often study historical droughts to put modern-day droughts in perspective. Since our  data  from  thermometers and  rain gauges only goes back about 100 to 150 years, scientists must research  paleoclimatology , the study of the atmosphere of prehistoric Earth. Scientists gather paleoclimatic data from  tree rings ,  sediments found in lakes and oceans,  ice cores , and archaeological  features and  artifacts . This allows scientists to extend their understanding of weather patterns for millions of years in the past.

Analyzing paleoclimatic data shows that severe and extended droughts are an  inevitable  part of natural climate cycles. North America has experienced a number of long-lasting droughts with significant effects. It is thought that droughts brought about the decline of the  Ancestral Puebloans  in the Southwest during the 13th century, and the central and Lower  Mississippian societies in the 14th to 16th centuries.

In South America, massive migration out of the once-fertile Atacama Desert 9,500 years ago can be explained by the onset of extreme drought.

In Africa, the Sahel region experienced a dry period from 1400 to 1750 that radically altered the  landscape . The water level in Lake Bosumtwi, Ghana, for instance, fell so low that an entire forest grew on the lake’s edges. Today, visitors can still see the tops of trees growing out of the lake—where the water is now more than 15 meters (50 feet) deep.

What scientists have learned by looking at Earth’s drought history is that periods of severe drought are a regular part of nature’s cycle. As devastating as droughts in the last century have been, they are considered relatively minor compared to the severity of earlier droughts that have lasted more than a century.

Major Droughts in the Past Century

The Dust Bowl of the 1930s is probably the most well-known drought experienced by the U.S. By 1934, 80 percent of the U.S. was struggling with moderate-to- severe drought conditions. The drought lasted nearly a decade and had devastating effects on crop production in the  Great Plains . The combination of lack of rain, high temperatures, and strong winds affected at least 50 million acres of land. Massive clouds of dust and sand formed as unusually strong winds lifted the dry soil into the air. These clouds could block out the sun for days, giving the period the name “ dust bowl .” In 1934, one dust cloud infamously traveled 2,414 kilometers (1,500 miles), from the Great Plains to the eastern U.S.

Mass migration was an indirect effect of the Dust Bowl . Farmers and their families were forced to migrate to other areas in search of work, and by 1940, 2.5 million people had fled the Great Plains . Of those, 200,000 moved to California. The influx of migrants into existing economies already strained by the Great Depression led to a rise in conflict , unemployment , and  poverty .

In the 1950s, severe drought returned to the Great Plains and southwestern United States, affecting half of the continental U.S. Low rainfall and high temperatures caused the production of crops in some areas to drop nearly 50 percent. Hay became too expensive for ranchers, and they had to feed their cattle prickly pear cactus and molasses to keep them alive. By the end of the five-year drought in 1957, 244 of Texas’ 254 counties had been declared  federal   drought disaster areas .

In the late 1980s, the U.S. experienced one of the costliest drought in its history. The three-year spell of high temperatures and low rainfall ruined roughly $15 billion of crops in the  Corn Belt . The total of all the losses in energy, water,  ecosystems , and  agriculture  is estimated at $39 billion. Federal assistance programs were able to help many farmers , but a longer-lasting drought would make it more difficult for the government to provide nationwide aid.

Droughts continue to affect the U.S. Texas has been suffering from drought since 2010, with 2011 ranking as the driest year in the state’s history. A September 2012  National Geographic  magazine article called Texas “The New Dust Bowl.” By 2013, 99 percent of the state was dealing with drought.

Australia is also a frequent victim of drought . The last decade has been especially severe , earning it the name The Big Dry or The Millennium Drought . Much of the country was placed under water restrictions, wildfires spread in the dry weather , and the water level in some  dams fell to 25 percent. In 2007, 65 percent of viable land in Australia was declared to be in a drought . The drought was officially declared over in April 2012.

Droughts that occur in the  developing world  can cause even greater devastation. The Sahel region in Africa, which includes eight countries, endured a series of droughts in the 1970s and 1980s where annual rainfall dropped by about 40 percent. In the early 1970s, more than 100,000 people died and millions of people were forced to migrate. Conditions continue to be critical in the area due to drought , overpopulation, failing crops , and high food prices. Drought emergencies for the region have been declared four times since 2000.

The  Horn of Africa , which includes the countries of Ethiopia, Somalia, Eritrea, and Djibouti, is particularly vulnerable to droughts . Because almost 80 percent of the population is rural and depends on agriculture for food and income, famine often accompanies drought .

Struggles for the region’s limited, remaining resources can lead to conflict and war. In 1984 and 1985, the Horn of Africa suffered one of the worst droughts of the 20th century. The U.N. estimates that in Ethiopia alone, 1 million people died, 1.5 million livestock died, and 8.7 million people were affected by the drought—including being hospitalized, forced to migrate, or forced to change professions. In Sudan, 1 million people died, at least 7 million livestock died, and 7.8 million people were affected.

The cycle of drought-famine-conflict has persisted in the region, with drought conditions returning every few years since 2000. In 2006, drought affected 11 million people across the Horn of Africa, and the resulting crisis killed between 50,000 and 100,000 people and affected more than 13 million.

Forecasting and Measuring Drought

Even though scientists are unable to predict how long a drought will last or how severe it will be, early warning systems and  monitoring tools can  minimize  some of drought ’s damaging impacts. There are a number of tools used to monitor drought across the U.S. Due to the limitations of each system, data from different sources are often compiled to create a more comprehensive  forecast .

The Palmer Drought Severity Index (PDSI), developed in 1965 by the  National Weather Service , is the most commonly used drought monitor . It is a complex measurement system and an effective way to forecast long-term drought . Its limitations are that it does not provide early warnings for drought and is not as accurate for use in mountainous areas because it does not account for snow (only rain) as precipitation . The PDSI is often used by the U.S. Department of Agriculture to determine when to begin providing drought relief.

Information from the Standardized Precipitation Index (SPI) is often used to supplement the PDSI data . The SPI, developed in 1993, is less complex than the PDSI and only measures precipitation —not evaporation or water  runoff . Many scientists prefer using the SPI because the time period being analyzed can easily be  customized . The SPI can also identify droughts many months earlier than the PDSI. The National Drought Mitigation Center uses the SPI to monitor drought conditions around the U.S.

The U.S. Drought Monitor , started in 1999, is a joint effort between three U.S. government agencies—the Department of Agriculture , the Department of Commerce, and the National Oceanic and Atmospheric Administration (NOAA). The Monitor   synthesizes data from  academic  and federal scientists into a weekly map indicating levels of dryness around the country. It is designed to be a blend of science and art that can be used as a general summary of drought conditions around the country. It is not meant to be used as a drought predictor or for detailed information about specific areas.

The Famine Early Warning System Network (FEWS NET) monitors satellite data of crops and rainfall across Africa and some parts of Central America, the Middle East , and Central Asia. Analysis of the data allows for early intervention to try to prevent drought -induced famine .

Preparing for Drought

People and governments need to adopt new practices and policies to prepare as much as possible for inevitable future droughts . Emergency spending once a crisis has begun is less effective than money spent in preparation. The  Federal Emergency Management Agency (FEMA)  estimates that every $1 spent in planning for a natural hazard will save $4 in the long term.

Many areas are extremely vulnerable to drought as people continue to be dependent on a steady supply of water. The U.S. Department of Agriculture recommends a series of  conservation  practices to help farmers prepare for drought . Some preventative measures include in stalling an  efficient   irrigation system that reduces the amount of water lost to evaporation , storing water in ditches along fields, regularly monitoring soil moisture, planting crops that are more drought -resistant, and rotating crops to allow water in the soil to increase.

In  urban areas , many cities are promoting water conservation by addressing water usage habits. Some enforce water restrictions, such as limiting days when lawns and plants can be watered, and offering free high-efficiency toilets and kitchen faucets.

Some drought-ravaged cities are taking even more extreme measures to prepare for future droughts. In Australia, the city of Perth is planning for a massive wastewater -recycling program that will eventually provide up to a quarter of the city’s water demands by 2060. Perth has been dealing with a decline in rainfall since the mid 1970s. The city, which is on the edge of a huge desert, is also struggling with its history of over-consumption of water. Water-hungry traditions such as planting large, lush lawns and parks will need to be addressed through conservation measures.

Drought in the USA In August 2012, drought conditions extended over 70 percent of the United States. Counties in 33 states were designated “disaster counties” by the government. In the beginning of 2013, drought still affected more than 60 percent of the country.

Dust Bowl John Steinbeck’s 1939 novel The Grapes of Wrath describes the Dust Bowl drought of the 1930s: “Every moving thing lifted the dust into the air: a walking man lifted a thin layer as high as his waist, and a wagon lifted the dust as high as the fence tops, and an automobile boiled a cloud behind it. The dust was long in setting back again.”

Yunnan Drought

The ongoing drought in Yunnan Province, China, has forced some families to transport water from more than 10 kilometers (6 miles) away.

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4. Droughts and Desertification

Areas at risk: regional and local scales.

Drought risk Map – source

Compare the above map with the one below of Total Annual Rainfall – source

Source: http://www.eldoradocountyweather.com/

Causes of droughts

Causes of desertification

Effects of droughts and desertification on people and the environment

Management strategies – case studies.

ENCYCLOPEDIC ENTRY

Below-average precipitation affects the amount of moisture in soil as well as the amount of water in streams, rivers, lakes, and groundwater.

Earth Science, Climatology, Conservation, Anthropology

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A drought is a period of time when an area or region experiences below-normal precipitation . The lack of adequate precipitation , either rain or snow, can cause reduced soil moisture or groundwater , diminished stream flow, crop damage, and a general water shortage. Droughts are the second-most costly weather events after hurricanes.

Unlike with sudden weather events such as hurricanes, tornadoes, and thunderstorms, it is often difficult to pinpoint when a drought has started or when it has ended. The initial effects of a drought may be difficult to identify right away, so it may take weeks or months to determine that a drought has started. The end of a drought is hard to identify for the same reason. A drought may last for weeks, months, or even years. Sometimes, drought conditions can exist for a decade or more in a region. The longer a drought lasts, the greater the harmful effects it has on people.

Droughts affect people in a several ways. Access to clean drinking water is essential for all life, and sources of water may dwindle during a drought . Without the presence of water, people must bring in enough water from elsewhere to survive. Water is also needed for crops to grow. When not enough precipitation falls to naturally water crops , they must be watered by irrigation . Irrigation is possible only when there is enough water in nearby rivers, lakes, or streams, or from groundwater . During a drought , these water sources are diminished and may even dry up, preventing crops from being irrigated and causing them to die off.

One person studying these problems is Alexandra Cousteau, a National Geographic Emerging Explorer whose latest initiative is Blue Legacy. She started Blue Legacy to raise awareness that we live on a water planet and must take care of it. Cousteau, the granddaughter of the famed ocean explorer Jacques Cousteau, believes that water will be a crucial issue in this century. She predicts that water problems such as drought , storms, floods, and degraded water quality will create “water refugees :” people migrating in search of water. Cousteau stresses that we must do all we can to protect Earth’s valuable freshwater resources.

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How Physical (Natural) Conditions Can Trigger Droughts in South Africa

Droughts in South Africa can be directly caused by various physical (natural) conditions. Understanding these natural triggers helps us prepare better for these challenging events. Here are the key factors and how they cause droughts:

Geographical Factors

• Location and Topography : The interior plateau, including the Highveld, naturally receives less rainfall due to its elevation and distance from the coast. This can lead to prolonged dry spells and drought conditions.

Ocean Currents

• Benguela Current : This cold ocean current on the west coast brings dry conditions to the region, reducing rainfall and contributing to drought.
• Agulhas Current : This warm current on the east coast usually brings moisture, but any disruption (like during El Niño) can result in drier conditions inland, increasing the risk of drought.

Seasonal Variability

• Wet and Dry Seasons : South Africa has distinct wet (October to April) and dry (May to August) seasons. If the wet season fails to deliver enough rain, the dry season can extend, leading to drought.

Soil and Vegetation

• Soil Type : Sandy or shallow soils, common in regions like the Kalahari Desert, cannot retain water well. This means these areas dry out quickly, making them more prone to drought.
• Vegetation Cover : Areas with sparse vegetation lose moisture rapidly due to high evaporation rates, increasing the likelihood of drought.

Atmospheric Circulation Patterns

• Intertropical Convergence Zone (ITCZ) : This band of low pressure around the equator shifts seasonally. If it moves too far from South Africa, it reduces the region’s rainfall, causing drought conditions.

Mountain Ranges

• Drakensberg Mountains : These mountains create a rain shadow effect. The western slopes receive less rain because the mountains block moist air from the Indian Ocean, resulting in drier conditions and potential drought.

By recognizing these physical (natural) factors, we can better understand and prepare for droughts in South Africa, ensuring more effective water management and resilience against these natural events.

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