In today’s episode we look at some ingenious solutions to water related problems. We start our aquatic journey by going on a tour of one of Victorian England’s most important feats of engineering. We discover a cheap and easy way to test for water quality, and learn about one of the biggest and most ambitious flood defence and general infrastructure projects in the world. And we hear how a water and sanitation engineer in Nairobi, Kenya, is trying to prevent huge volumes of H2O being wasted in leaks.(Image: The Octagon at Crossness Pumping Station, London. Credit: P. Scrimshaw)Presented and produced by Elizabeth Hotson

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