Is Mexico City built above water?
Is Mexico City built above water? The Aztec city was on an island in Lake Texcoco, but the Spanish drained the surrounding lake over centuries and expanded Mexico City onto the new land. Today, much of the city stands on layers of sand and clay — up to 100 yards deep — that used to be under the lake.
Where does Mexico City sewage go?
The city currently transfers its wastewater into the Gran Canal built in 1975 through the 68km Emisor Central tunnel. The tunnel is unable to hold the huge amount of wastewater and rainwater flowing into it during the rainy season.