Originally, much of the valley lay beneath the waters of Lake Texcoco, a system of interconnected saline and freshwater lakes. The Aztecs built dikes to separate the fresh water used to raise crops in chinampas and to prevent recurrent floods. These dikes were destroyed during the siege of Tenochtitlan, and during colonial times the Spanish regularly drained the lake to prevent floods. Only a small section of the original lake remains, located outside the Federal District, in the municipality of Atenco, State of Mexico. In recent years, architects Teodoro González de León and Alberto Kalach, along with a group of Mexican urbanists, engineers and biologists, have developed the project plan for Recovering the City of Lakes. The project, if approved by the government, will contribute to the supply of water from natural sources to the Valley of Mexico, the creation of new natural spaces, a great improvement in air quality, and greater population establishment planning.
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