80 



Griffith Taylor : 



»fjf WATER SUPPLY 



by Di wars l. 



1-6 - Wells and Springs. 

 Fig. 1. 



tinuous sheet. Every filament of this sheet is always moving down 

 the steepest grade. The water-table (see Text Fig. 2) differs 

 from the surface of the ground in that the water is not confined 

 to well-defined channels, though there may of course be under- 

 ground gullies where the water-sheet is thicker. It is very 

 important to understand this concept of the water-table. Almost 

 every miner knows that in similar country he reaches the level 

 where pumping is necessary at about fifty feet; but he remains 

 a believer in the water diviner's prowess in face of his com- * 

 mon sense ! The region under discussion receives about nineteen 



