By William Kinnimond Burton

The writer covers themes starting from diversified features of water and ascertaining even if a proposed resource of provide goes to be adequate to other forms of dams, sand filtration, and pumping machinery.

summary: the writer covers issues starting from assorted characteristics of water and ascertaining even if a proposed resource of offer goes to be enough to other forms of dams, sand filtration, and pumping equipment

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Additional resources for The water supply of towns and the construction of waterworks : a practical treatise for the use of engineers and students of engineering

Sample text

This is a very interesting process, involving the apparent paradox that, by adding carbonate of lime to water, we get rid of carbonate of lime ! W h e n it is said that water is of a certain number of degrees of hardness (Clark's scale) it is meant that a gallon of water will precipitate as much soap as would be precipitated by a gallon of pure water in which that number of grains of carbonate of lime had been dissolved. Thus water of ten degrees of hardness will precipitate as much soap as would pure water to which carbonate of lime to the amount of ten grains per gallon had been added.

In some cases, where large quantities of water are used for trade or manufacturing purposes, it is possible to make some * In Japan the cubic shaku may, for equivalent to the cubic foot. all waterworks purposes, be taken as C i8 THE WATER SUPPLY OF TOWNS. estimate of these, but the somewhat indefinite " domestic supply" is very difficult to estimate. In fact, although certain attempts to estimate the quantities of water needed in dwelling-houses have been made from consideration of the different items of consumption, it is now generally conceded that it is better to make use of past practice than to depend on such estimates.

It is, therefore, customary to allow but little margin in the case of filter-beds, making, however, all provision for adding new beds one at a time as they may be needed. The case of pumping machinery for large works is somewhat similar. There are generally several sets of pumps, one for " stand by," the others to work together. I f due provision of space be made from the beginning, new pumping machinery may be added as it becomes necessary at about the same rate as the first. Reservoirs, especially when covered, come somewhere between QUANTITY OF WATER TO BE PROVIDED.

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