IRRIGATION WATER IN THE SOIL 



113 



these experiments shows the increase in each foot 

 about eighteen hours after a small and also a larger 



irrigation : — 



It will be seen that in the soil that was already 

 well filled with water, the addition of water was felt 

 distinctly to the full depth of 8 feet. Moreover, 

 it was observed in these experiments that even \'ery 

 small rains caused moisture changes to consideral^le 

 depths a few hours after the rain was over. For 

 instance, 0.14 of an inch of rainfall was felt to a 

 depth of 2 feet within .3 hours; 0.93 of an inch 

 was felt to a depth of 3 feet within the same 

 period. 



