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sustainable cities

Solving for water security at the source

Andrea Erickson's picture

Aerial view looking south toward the Gulf of Mexico down the Wax Lake Delta, Louisiana.
Photo © Carlton Ward Jr.
 

New York City faced a challenge in the 1990s: the city needed a new water filtration system to serve its nearly 8 million people. But the prospect of spending $6 to 10 billion on a new water treatment plant, and another $100 million on annual operating costs, was daunting. So, city officials took a closer look at the source of their water—the Catskill Mountains.
 
Water from the Catskills flows through 120 miles of forests, farmlands and towns to reach New York City. When that landscape is healthy, it acts as a natural purifying system, but certain development and agricultural practices can result in impaired water quality. For city officials, reaching out to local farmers and landowners and compensating them to restore and conserve their lands in the watershed, combined with some land acquisition, proved to be significantly cheaper than building and operating a new treatment plant.
 

Is shared sanitation the answer to Maputo’s sanitation challenge?

Baghi Baghirathan's picture
 
Sanitation Blocks in Charmanculo

Poor sanitation is the all too familiar story in many expanding African cities and Mozambique’s capital city Maputo is no exception. In fact, over half of the country’s urban population lack access to even basic sanitation. With an estimated 668 million city dwellers around the world not having access to safe sanitation, overcoming sanitation challenges in cities like Maputo will go a long way towards achieving the Sustainable Development Goal for safe sanitation (SDG 6.2).
 

30 years of working together to solve Shanghai’s most pressing water problems

Sing Cho's picture

Also available in 中文

Cities are growing at a staggering rate, changing our world beyond recognition. For the first time in history, over half the population -- 55 percent -- lives in urban areas.  By 2050, that number will rise to 68 percent.  This rapid urban growth has given rise to sprawling megacities, many of which are in Asia and Africa.

Perhaps no place epitomizes this trend better than Shanghai. In 1990, the city was still primarily an industrial hub with a population of 13 million. By 2016, the figure had ballooned to 24 million, making Shanghai one of the largest metropolitan areas in the world and the financial and economic hub of China. 

No place epitomizes the global trend of urbanization better than Shanghai. 

Money from waste? Revamp your view on sanitation

Daniel Ddiba's picture

As an undergraduate student in Kampala, my head was full of thoughts about how I was going to make a living after my studies. Back then Rich Dad Poor Dad was still a best-seller, and I thought to myself: I can become a billionaire if I sell a billion of something to a billion people. Needless to say, it would have to be something that anyone can afford, like toothpaste or chewing gum.
 
So, I wondered, what does every human need? It dawned on me: everyone needs water, food, and energy, every day. The next question was how I could make valuable goods from all the three as a civil engineer.

 

Wastewater treatment: A critical component of a circular economy

Diego Juan Rodriguez's picture
 

Also available in Español 

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The 8th World Water Forum was held in Brazil a few days ago. What's ironic is that the more than nine thousand of us attending this Forum were discussing water-related issues in a city of three million grappling with a severe water shortage. After checking in at my hotel, the first thing I found in my room was a notice from the Government informing guests of this crisis and recommending ways to reduce water use. We recently learned of the predicament in Cape Town, South Africa, which was on the verge of running out of this essential liquid—a plight facing many cities around the world.