6.4 Summary

After passing through a treatment works, water flows via transmission mains to service reservoirs which act to even out variations in consumption during a 24-hour demand period. It is then taken by distribution mains from the service reservoirs to the consumers. The head of water necessary for flow is provided by positioning the service reservoir at the correct level or by pumping. A pumped pipeline is called a rising main. The size of mains pipelines depends on the quantity and flow rate of
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5.8 Additional treatment

As a result of strict standards set by the EU Directive on the Quality of Drinking Water, it is now often necessary for drinking water to have further treatment to remove components such as nitrates and trace of organics.


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1.4.1 The role of images

We can use images in several ways.

  • To motivate, to attract the attention of the user, to amuse and to persuade. These uses are particularly important in advertising and marketing.

  • To communicate information. This is often exploited in computer-based learning materials.

  • To help overcome language barriers. This approach is widely used in instruction manuals for consumer items.

  • To support interaction. Fo
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