During the dry season, from May through November, the River Seco is just a trickle fed by wastewater from homes, slaughterhouses, tanneries and mining operations. Along its course through El Alto its waters run red with blood, vivid green with algae, black with oil and a thick brilliant rust color from mineral processing. The riverbed also doubles as a dump - plastic bags, rotting food, tires, dead dogs and feces line its banks. The water smells sharp and bitter. When the rainy season arrives in December, everything sweeps toward the lake. Image by Noah Friedman-Rudovsky. Bolivia, 2011.