用水单位各自为政，水资源无法实施统一的调度；

Water source can't be acted by united dispatch;

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文章通过实例，详细讨论了三种计算方法的合理性，通过讨论设计流量与用水单位数之间的函数关系，最后提出给水分界点的观念，便于工程实际应用。

After the functional relation between designed flow rate and water demand unit is analyzed, the concept of demarcation point of water supply is put forward, which is convenient for actual .

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要改善用水效率是绝对可行的，且富裕国家的工业人士早就在做，为每一顿钢铁节省用水，以增加国民所得的每一个单位(见下图)。

Improving efficiency is doable and industrial users have done it, cutting the amount of water needed to make each tonne of steel and each extra unit of GDP in most rich countries (see first chart).

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