1
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The amphitheater was designed with a network of pipes and sewers for draining away rainwater.

2
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As the cavea was shaped like a funnel, it was necessary to prevent the rainwater from converging on the arena floor area.

3
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Roman engineers created three annular sewer pipes (A, B, C) and a drain, which were distributed under the amphitheater.

4
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Pipe B was linked to chambers that contained holding tanks for water that could be used to clean the edifice.