The Nabor Carrillo Reservoir is outlined and contained by a levee made of red tezontle rocks. Product of volcanic emanations, these rocks were once cast out of the earth’s center to cool down on the surface and break into small chunks. Today, they guard a body of water that was also cast out. The Nabor Carrillo receives a shiny-blue, clean-smelling, salty water, as if from the sea. It has made a long trip, just like the stones. Black and dense, the sewage water of northeastern Mexico City is dumped in Lake Churubusco, on the western edge of Lake Texcoco. There, it is treated by refined methods and invisibly pumped into the Nabor Carrillo. The heat evaporates the water into the air breathable from the shore, while millions of gallons of processed water arrive to the opposite shore. Flocks of ducks, migrating every winter in a long journey from Canada, make a stop on this water. [...]
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