CITY WATER SYSTEMS 



483 



ing, and for power purposes, and occasionally to furnish heat 

 for heating homes and places of business (Arts. 77 and 153). 

 Inasmuch, however, as public health is so largely dependent 

 upon a safe, uncontaminated water supply, the water system 

 of a city is more commonly controlled by the city government. 

 566. Amount of Water Used. It has been estimated that 

 the amount of water used for household purposes in homes not 



FIG. 295. A modern city pumping station. Three-stage centrifugal 

 pump, belt-driven by 150 h.p., three-cylinder gas engine, with suction gas 

 producer. 



supplied with running water or water under pressure is from 1 

 to 4 gal. daily per person. The amount of water required per 

 person in any city depends upon the occupation of the in- 

 habitants. A manufacturing city requires generally a much 

 larger supply of water than does a residence city. It is com- 

 mon practice to construct water plants capable of furnishing 

 about 15 gal. daily per capita in the ordinary city where the 

 demand is not great for manufacturing purposes. In some 

 American cities containing many factories and other industries 



