It’s official: For the first time in human history, more people are living in cities than rural areas — a trend that’s certain to accelerate. But with most freshwater systems already stressed, how will the world’s cities be able to supply water — and water that’s clean — to a projected 1.5 billion new residents over the course of the next 20 years?
That’s one of the questions Nature Conservancy scientist Rob McDonald set out to answer in a new study published in Ambio: A Journal of the Human Environment. For the study, McDonald and his co-authors developed a geography of urban water supplies according to three major constraints: water availability, water quality, and water delivery:
- They calculated that water availability may be an issue for more than 500 million people worldwide living in arid areas of the world of the world likely to face water shortages, like the western United States, Australia, coastal Peru and Chile, North Africa, the Middle East, and central Asia.
- Poor water quality may be an issue for 890 million people, particularly in cities concentrated in major river basins like India’s Ganges and China’s Yellow River.
- Finally, a whopping 1.3 billion people may be living by 2030 in cities with water delivery problems, particularly in fast-growing cities that lack resources and infrastructure.
So what’s the solution? McDonald and his co-authors note that the most common response to these challenges is to tap groundwater, a generally unsustainable approach.
Other strategies include long-distance water transport, reservoir systems, rainwater harvesting, and purchase from private water sellers.
But there are strategies to use existing supplies more wisely, says McDonald, like using treated waste water, replacing old water intrastructure, and converting agriculture to less water-intensive use.
“The world is basically adding a city the size of Washington, D.C. to the planet every week,” says McDonald. “So that’s the real challenge if you’re an urban planner and trying to get water to your citizens.”
Source: The Nature Conservancy (Julia Kumari Drapkin)
These predictions are a good incentive for urban dwellers to start becoming more water self-sufficient. If rainwater harvesting or greywater recycling do not suit your situation, a simple form of ‘water insurance’ is to store water in water tanks. JoJo Tanks have a wide range of water tanks available, including special types that are suitable for small properties and buildings – Water Rhapsody Mpumalanga is an official JoJo Tanks dealer – contact us for all your water tank and water conservation requirements.
Water Rhapsody Water Conservation Systems and Yes Solar Mpumalanga offer eco-friendly rainwater collection systems, rainwater tanks, grey water recycling, swimming pool backwash recycling, water-saving toilet flush mechanisms and high quality Solsquare solar water geysers.
Contact us for a FREE QUOTE on a solar water heater, rainwater harvesting system (see rainwater FAQ), gray water recycling system or water tank (we are authorized South African JoJo Water Tanks dealers and supply the full range of JoJo water tanks and JoJo tank stands). Our water tank prices are hard to beat in the Mpumalanga & Limpopo Lowveld.
Water conservation and renewable energy such as solar energy are two issues that affect the global community; make a difference and start conserving water and switch to renewable energy today. Another way of reducing your carbon footprint is to switch to green insurance, now available in South Africa. Consider building and decorating with eco-friendly bamboo products.