WATER FIGURES 



491 



Table of equivalents for moving water — Continued 



Foot-loss by friction of water through pipes, by gravity (Ogden) 



The spring or other source used for a water-supply would have to be 

 as much higher than the highest fixture is as shown in the table, in 

 order to provide the pressure required to overcome the friction in the 

 pipe. The table shows the force required to keep the water moving 

 through a small pipe, expressed in number of feet of head, when the 

 water flows by its own weight and is not forced by a pump : — 



