这种现象并不仅仅出现在纽约，在美国有将近800个城市依靠破旧的排水系统，使用同一个管道来收集暴雨径流水，工业废水和人用污水。

And New York is not alone. Nearly 800 American cities rely on decrepit systems that collect storm-water run-off, industrial waste and human sewage in the same pipes.

youdao

事实上，底面渗漏现象随处可见，供水商也接受了每日每千米管道3500升的最低漏水量。

Indeed, background leakage is so pervasive that water suppliers accept 3,500 litres of water per kilometre of pipe per day as the minimum achievable loss.

youdao

事实上，底面渗漏现象随处可见，供水商也接受了每日每千米管道3500升的最低漏水量。

Indeed, background leakage is so pervasive that water suppliers accept 3, 500 litres of water per kilometre of pipe per day as the minimum achievable loss.

youdao