USES OF WATER 125 



QUESTIONS 



1. What is the source of the water supply of your city? 



2. Has there ever been an epidemic of typhoid fever in your 

 city? If so, what was the cause? 



3. Is any method to purify the water supply used in your city? 



4. Should rain water be used for drinking purposes? Why? 



5. Where do the five largest cities of the United States get 

 their water supply? 



6. What does the term " plumbing " include? 



7. What is the use of " traps " in plumbing systems? 



8. Why does the water pressure vary at different points in a 

 city water system? 



