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Critical Water Shortage in South Africa

The outlook in South Africa is grim as a major city's water supply slowly runs out. Day Zero for Cape Town is approaching. In talking with students about the crisis, teachers can lead discussions about what has happened and ways in which science may be used to help with conservation efforts.

Cape Town South Africa Water Crisis--Students explore real-world challenge of water supply

Reports about the water crisis in South Africa read like something from dystopian science fiction, so much so that the day on which Cape Town will run out of water has been dubbed "Day Zero." And that day is coming soon, even sooner than scientists first projected. According to news reports, officials moved up the projection for Day Zero because, despite conservation efforts, Cape Town is running out of water even faster than expected. Right now, Day Zero is penciled in for April 12, 2018. That could still change, but whatever day ends up being Day Zero, it will be the day that a major city officially runs out of water.

Without a doubt, this is the stuff of science fiction novels, except it is happening to real people, in a real city. Cape Town's water crisis is partly a result of an extreme drought spanning several years, a large and growing population of more than four million, and changes in climate. That the city sits at the base of Africa between the Altantic and Indian Oceans and is running out of water is hard for many to understand. Water seems to be everywhere. Potable (drinkable) water, however, is almost gone, and the reservoirs are running dry. Cape Town officials have taken steps to encourage water conservation and limit water consumption. People are saving and reusing water.

And the city is running out of water even faster than anticipated.

How Much is 50 Litres?

Starting February 1, Cape Town residents will be limited to 50 litres of water per person. This graphic from the Defeat Day Zero campaign helps show what you can do with 50 litres.

Defeat Day Zero Water Usage Image

Studying this image, students will quickly be able to pinpoint potential problems as they see that there is not enough water to do "this" or "that." If you can only do "this thing" once a day, what happens? What other issues arise? What combinations of water usage make the most sense to students? Which things would students forego to distribute their water allotment in different ways? What kinds of choices will families need to make?

Teachers can help students understand the realities of a limitation of 50 litres a day relative to their own daily use of water by doing a simple data tracking experiment as a class. Have students track their own family's usage of water (using the categories in the Defeat Day Zero image or else using a limited set of categories established by the class) for a period of days (e.g., 1 day, 3 days, over the weekend). How many times a day was the toilet flushed? How many times were hands washed? How many showers were taken and for how long? How many bottles of drinking water were used? How many times were dishes washed? Elementary school students might be tasked with tracking only a single type of water usage; older students might track multiple points of water consumption. After the tracking period, students can average classroom data about water usage, determine which categories demand the most water, and brainstorm ways that water might be conserved in their own homes. As a hands-on math exercise, students can do basic analysis of classroom data and practice making charts, tables, or infographics to showcase the information. Tip: Google Classroom teachers can use the "Create Assignment" button at the top of this page to assign this post along with details regarding home tracking of water usage. (Learn more about using Google Classroom with Science Buddies.)

Seeking a Solution

Cape Town Residents are reportedly already catching, saving, and reusing household water. What issues arise with reusing water, also called greywater? Can greywater be filtered for greater safety? Given Cape Town's location, is desalination a viable solution? There are desalination efforts in progress (reportedly costing billions of dollars), but the results may not be effective enough or soon enough to make a difference. There are also additional environmental challenges to solve with the brine runoff generated by a desalination plant.

Day Zero seems inevitable, but the crisis leaves many questions to be answered. For students watching this real-world situation unfold, the reality that a city surrounded by oceans can run out of water is a concrete examples of the kinds of global challenges we need to solve. Talking with students about the issue and the kinds of solutions that can be used to deal with water problems, including shortages, recycling, filtering, and desalination can help students better understand the challenge cities around the world face in ensuring potable water for the population. What solutions can make a difference? Students can brainstorm science and engineering solutions and explore further with projects like:

Further Reading

For additional reading about drought, water safety, and other water-related science, see the following posts:

For additional reading about the current crisis in South Africa, see:



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