In the countryside of Murcia, Spain, Dutch company Bejo has built two huge basins at the end of a dried up trail of devastating mud flows. Water is collected for use during dry periods on the rare days when the rain cascades down. Special plants and some algae-eating fish keep the water clean in a natural way. An apparently simple solution to water shortages. But you have to think it up, finance it and then be able to carry it out successfully.
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