至于超过了设计能力、城市扛不住的部分，“需要设计冗余区域，让水淹之处，是可以被淹的地方，是指定的区域，雨过之后，清理掉水淹区域，减少对正常生活工作的影响。”如此，实现城市建设成本与舒适度、安全性的平衡。

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