Today, much of the city stands on layers of sand and clay — up to 100 yards deep — that used to be under the lake. These soft, water-laden sediments make the city uniquely vulnerable to earthquakes and other problems. 2 MI. ancient lake sediments.
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Answer and Explanation: The Spanish drained Lake Texcoco because flooding was becoming a major problem for the city, by then being called Mexico City. Situated in a high-elevation valley, Lake Texcoco sits at the bottom of a natural drainage system in Mexico's central mountains.
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.