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Producing reliable, clean and sustainable water supplies is one of the great challenges of our time. Where rapidly expanding concentrations of people live in dense settlements, this challenge is particularly acute. Greater Metropolitan Mexico City has a population of over twenty-one million. The city is expanding at its periurban edges, swallowing up the countryside through a combination of rural to urban migration and population growth.

Expanding settlements, roads, vehicles and intensive agriculture replace forests and grasslands that are vital in securing the city’s water supply. Concreting over the land reduces water absorption and creates flooding during heavy rain. The watershed…

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