The construction of Tenochtitlan on a small island in the saline waters of Lake Texcoco was one of the most notable engineering achievements of the pre-Columbian Americas. The Mexica had to overcome a number of significant challenges, including the marshy and unstable ground, the salty water, and the danger of flooding. The Mexica met these challenges with a series of innovative engineering solutions, including the development of the chinampa system of agriculture, the construction of the great causeways, and the building of the aqueduct that brought fresh water from the springs of Chapultepec.
The Chinampas
The most important engineering achievement of the Mexica was the development of the chinampa system of agriculture, which allowed them to grow crops on the lake margins. By heaping up mud, decaying vegetation, and sediment in the shallow margins, the Mexica built a checkerboard of long, narrow fields, each typically about 30 meters in length and 2 to 4 meters across. The fields were separated by canals wide enough to handle by canoe, which gave the farmers access to each plot and provided constant water to the roots of the crops.
The chinampas were extraordinarily productive, and they allowed the Mexica to feed a large urban population on a relatively limited area of land. The chinampas were so productive that the Mexica were able to grow multiple crops per year, including maize, beans, squash, tomatoes, chili peppers, amaranth, and chayote. The chinampas were also used for the production of flowers, which were an important source of income for the Mexica state.
The Causeways
The Mexica built a network of three great causeways that connected the island of Tenochtitlan to the mainland. The causeways were built of stone and earth, and they were several kilometers long. The causeways were used for transportation and for the movement of armies, and they were central to the urban infrastructure of Tenochtitlan.
The causeways were also designed to be defensible, with bridges that could be raised to allow the passage of canoes and to prevent the approach of enemies. The causeways were wide enough to allow the passage of armies, and they were used for the movement of goods and people between the island and the mainland. The causeways shaped the Mexica system of urban planning, and they allowed the Mexica to integrate the island with the surrounding region.
The Aqueduct
The Mexica built a great aqueduct that brought fresh water from the springs of Chapultepec to the city. The aqueduct was a remarkable engineering achievement, and it required the construction of a series of channels, tunnels, and bridges. The aqueduct was built in two stages, the first under the reign of Moctezuma I and the second under the reign of Ahuitzotl.
The aqueduct was built of stone and stucco, and it was about 4 kilometers long. The aqueduct was designed to bring fresh water from the springs of Chapultepec, which were located on a hill to the west of the city. The water was carried in a channel that was built on a raised structure, and the channel was supported by a series of arches. The aqueduct was central to the urban infrastructure of Tenochtitlan, and it provided the city with a reliable source of fresh water.
The Dyke of Nezahualcoyotl
The Mexica also built a great dyke, called the Dyke of Nezahualcoyotl, that separated the salty waters of Lake Texcoco from the freshwater lake to the west. The dyke was built of stone and earth, and it was several kilometers long. The dyke was designed to prevent the salty water from contaminating the freshwater that was used for drinking and for the irrigation of the chinampas.
The dyke was a remarkable engineering achievements of the Mexica, and it was central to the urban infrastructure of Tenochtitlan. The dyke allowed the Mexica to control the level of the lake and to prevent flooding, and it protected the chinampas from the salty water. The dyke shaped the Mexica system of water management, and it was essential for the survival of the city.
The Buildings
The Mexica also built a number of impressive buildings on the island, including the Templo Mayor, the palaces of the Tlatoani and the nobility, and the great ballcourt for the ritual ballgame. The buildings were built of stone and stucco, and they were decorated with elaborate sculptures and murals. The Templo Mayor was the religious and political center of the city, and it was rebuilt and enlarged several times during the history of Tenochtitlan.
The buildings were constructed on foundations of stone and wood, and they were designed to be stable on the marshy ground of the island. The Mexica used a number of techniques to stabilize the foundations, including the driving of wooden piles into the lakebed and the construction of stone platforms. The buildings were evidence of the skill of the Mexica engineers and architects, and they were among the most impressive structures of the pre-Columbian Americas.
Related Articles
- Founding of Tenochtitlan — the broader context
- Why did the Aztecs build Tenochtitlan on a lake? — the site
- What does the eagle on the cactus symbolize? — the founding legend
- Chinampas and Aztec Agricultural Innovation — the agriculture
- Aztec Architecture and the Great Temple — the buildings
- History of the Aztec Civilization — the broader history