But you've also had the complete destruction of the city's water systems, of the sewerage systems.

但城市的供水系和排污系也遭到彻底破坏。

Because American cities were built on grids, making it easier to connect new homes to sewerage and transport.

因为美国城市建立在电网之上，因此更容易将新住宅与污水处理和交通连接起来。

He even had a small model of a landfill and explained the importance of proper sewerage systems.

他甚至制作一个小型垃圾填埋场模型， 并解当的污水处理系的重要性。

Gaza has a chronic water shortage leaving tap water undrinkable and forcing the Palestinians to pump huge amounts of untreated sewerage into the sea.

加沙长期缺水，导致自来水不能饮用，迫使巴勒斯坦人往大海中倾倒大量的未处理垃圾。

So if you imagine that groups of school children, because it's just too far away to get on the main sewerage.

因此， 如果你设想一下， 一群学校的孩子会使用这个可堆肥厕所，因为这里离主排污系实在太远。

This 200 foot tall water tower held 500,000 gallons of potable water in a tank at the top, while a 40 foot sub-basement held the 300,000 gallon sewerage system.

这个 200 英尺高的水塔顶部的水箱可容纳 50 万加仑的饮用水，而 40 英尺深的地下室则容纳 30 万加仑的污水系。

As cities expand, and more and more land is underneath concrete or paving, less water is absorbed and more needs to be channelled away by storm drains and sewerage systems.

随着城市扩张， 越来越多的土地被混凝土或铺路材料覆盖，导致更少的水分被吸收， 更多的水需要通过雨水排水系和下水道系排出。