We believe water scarcity is one of the greatest challenges of our time. According to the World Health Organization (WHO), 2.2 billion people do not have access to clean drinking water1. Proper sanitation presents another problem, exposing 2.4 billion people to diseases like dysentery, cholera, and hepatitis to name a few, as cited by the World Wildlife Association2.
Looking ahead, the United Nations (UN) forecasts the global population will grow by more than 2 billion people to 9.8 billion by 2050 and climate change is altering precipitation, rainfall, runoff, and other patterns that result in more floods and droughts, as well as higher sea levels.
Acute water shortages are on the rise and have recently occurred in Cape Town, South Africa; Chennai, India; São Paolo, Brazil; and Basra, Iraq, plus dozens of smaller cities. Regionally, a 2021 analysis by the World Bank identified the Middle East and Northern Africa (MENA) as the world’s most water scarce region with 60 percent of the population living in high water stress areas3.
Water scarcity can have spillover effects. It is a leading cause of migration after war, conflict, and unemployment but migrants from these areas tend to have less education and lower skills than average, posing challenges on the cities and towns that receive them, most of which have been forced to dedicate resources to confronting COVID in recent years. And the very poor cannot afford to migrate. All around the globe, scientists and researchers are working on solutions to reduce water scarcity. Often this starts with timelier and more transparent data. Today’s cellular technology can be combined with metering analytics software4 to allow water utilities to remotely report meter flow, provide timely measurement readouts and reduce non-revenue water usage across large geographical areas.
These systems are less labor intensive than drive-by-automatic meter readings that produce monthly reports, especially in challenging terrains, and they allow for real-time water leak detection. Consumer engagement tools on iOS and Android devices, allow customers to be more accountable in their water usage. Storing and producing fresh water more optimally can also help mitigate water stress.
In a study published in Energy
and reported in WaterWorld5
, researchers found the amount of river flow could double in Southeastern Brazil by keeping the region’s reservoirs full. To provide some context, Brazil gets two-thirds of its energy from hydropower and droughts not only impact Brazil’s electricity but global food prices, as well. Usually, hydropower reservoirs reduce the river flow below dams. However, in areas with close to 100% humidity, evaporation rates are small and maintaining a full reservoir significantly increases precipitation. The study found that to maximize water and energy resources, smaller reservoirs on the head of rivers should be filled before larger ones and an ideal balance, on average, was found to combine 78% full reservoirs at the end of October with a hydropower capacity factor of 50%.
Today, there are more than 20,000 desalinization plants across 150 countries, according to the American Society of Mechanical Engineers6. But they consume a lot of energy. In Saudi Arabia, for example, around 10 percent of the country’s electricity is used for desalinization and, in Abu Dhabi, desalinization accounts for more than 22% of CO2 emissions. There is a big incentive to use renewable energy in the production of fresh water. Solar power panels suffer from an over-heating problem in arid areas where solar irradiation is high, leading to a lot of wasted heat. The good news is that this excess heat can be used as a desalinization power source, without affecting regular electricity generation, achieving both electricity and freshwater production off the same panel.
Agriculture accounts for 70% of freshwater usage and incorporating digitization into agriculture systems holds tremendous promise. Data-driven decision-making using soil-moisture sensors can reduce water consumption by up to 30% by allowing farmers to automatically water their crops and apply fertilizer only when it is necessary. Sensors can also inform farmers of conditions that might threaten their crops, so they can act in a timely way.
In very poor areas, inexpensive drip irrigation systems involving nothing more than pipes with little holes, can route water directly to crop roots where it is needed before rainfall evaporates. Where possible, farmers can also capture rainwater and store it in tanks or reservoirs to use when the weather is drier. Farming methods that use comparatively little water also offer potential. Aquaponics combines the techniques of fish farming (aquaculture) and hydroponics (growing plants without any soil). According to the UN’s Food and Agricultural Organization, some integrated farms have been able to reduce their water consumption by 90% compared to traditional methods of agriculture7.