CAPILLARY MOVEMENT OF SOIL MOISTURE. 



37 



Table 24. — Water used by flumes at different 

 periods of time. 



rate of movement as compared with flumes 39 and 76 is more uni- 

 form. The figures for flume 206 show the rapid decrease of rate of 

 movement of the moisture from day to day. 



WATER USED* 



The amount of water used in the flumes inclined upward is greater 

 than for the vertical flumes and less than for the horizontal flumes. 

 The total quantity of 

 water used by the flumes 

 inclined at an angle of 

 15° upward from the 

 horizontal is given in 

 liters in figure 5 in the 

 small circles. Table 24 

 gives the total quantity 

 of water, in liters, used 

 by the different flumes 

 at the end of different 

 periods of time. The 

 same information i s 









Flume. 







Number 

 of days. 

























39 



58 



76 



96 



206 





Liters. 



Liters. 



Liters. 



IAters. 



Liters. 



1 



7.5 



10.5 



5.0 



11 



7.0 



3 



13.0 



15.0 



8.0 



20 



9.0 



5 



15.5 



19.0 



10.0 



27 



10.5 



10 



19.0 



23.0 



14.0 



39 



13.5 



15 



22.0 



25.5 



17.0 



48 



14.75 



20 



24.5 



28.0 , 



20.5 



55 



15.75 



30 

 40 

 50 



27.5 

 31. 25 



35.0 



32.5 



36.75 



41.0 



26. 25 



33.0 



40.0 



65 





I 





---------- 





! 



given in Table 25, in percentages based upon the quantity of water 

 used by each flume at the end of the thirtieth day. 



This table shows that the heavier soils as represented in flumes 39 

 and 58 use relatively more water during the first few days of the 

 experiment than do the lighter soils. In the heavier soil about the 

 fourth clay 50 per cent of the total quantity of water used in 30 days 



had been used, while for the 

 lighter soils there had been used 

 on the fourth day only about one- 

 third the quantity used in 30 

 days. 

 Table 26 gives the 



Table 25. — Water used, by days, in per- 

 centages of total used in 30 days. 







Flume. 





Number 

 of days. 





















39 



58 



75 



96 





Per cent. 



Per cent. 



Per cent. 



Per cent. 



1 



27 



32 



19 



17 



3 



47 



41 



31 



31 



5 



57 



59 



38 



41 



10 



69 



71 



53 



60 



15 



80 



78 



64 



74 



20 



90 



86 



78 



86 



30 



100 



100 



100 



100 



40 

 50 



114 

 121 



113 



126 



125 

 152 









average 



quantity of water removed from 

 the tanks at different periods of 

 time to advance the moisture in 

 the flumes an average distance of 

 1 inch. That is, in flume 39 at 

 the end of the fifth day there had 

 been removed from the tank 15.5 

 liters of water and the moisture had advanced in the flume a total 

 distance of 28.55 inches, or there had been used an average of 543 

 cubic centimeters of water for each inch the moisture had advanced. 



Table 26 shows that in the lighter soils the quantity of water used 

 near the beginning of the experiment was very much less than the 

 quantity of water used during the last part of the experiment. In 



