1. History of the Colosseum
Rather than building walls around the lake, the engineers designed the foundation to sit on the clay bed of the lake, nearly 25' below the ground level with drains built under the entire circumference of the foundation, as well as drains throughout the entire area inside the Colosseum spaced every 12'. ... Foundation engineering and planning for the Colosseum was a very big issue, mostly because of the material that it sits on, clay, and the fact the lake was naturally spring fed and on the site. ...
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