Girls and women carrying plastic jerry cans of water on their heads is a common sight in rural areas of poor countries. The WaterWheel eases that burden by storing water in a round 50-litre container that doubles as a wheel.

Designed after consultations with villagers in the dry northern Indian state of Rajasthan, the Water Wheel is made from high-quality plastic that can withstand rough terrain. It will sell for $25-$30, compared with $75-$100 for similar products.

“Our goal is to distribute on a large scale, on small margins to 10,000-20,000 customers a year,” says Cynthia Koenig, founder and chief executive of Wello, a US social venture working on ways to deliver clean water in poor countries. Wello won a $100,000 Grand Challenges Canada prize to develop the Water Wheel.

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