CAPILLARY MOVEMENT OF SOIL MOISTTJEE. 



25 



Table 12. — Distance moved and water used, expressed in percentages of the total 



for 30 days. 



Number 

 of da; T s. 



Flume. 



20 



31 



50 



70 



90 



Water. 



Dis- 

 tance. 



"Water. 



Dis- 

 tance. 



Water. 



Dis- 

 tance. 



Water. 



Dis- 

 tance. 



Water. 



Dis- 

 tance. 



1 

 3 



5 

 10 

 15 

 20 

 30 



Per cent. 

 17 

 30 

 38 

 53 

 67 

 81 

 100 



Per cent. 



Per cent. 

 22 

 36 

 42 

 58 

 70 

 81 

 100 



Per cent. 

 27 

 46 

 56 

 73 

 84 

 91 

 100 



Per cent. 

 26 

 42 

 51 

 67 

 78 

 86 

 100 



Per cent. 

 28 

 45 



Per cent. 

 18 

 30 

 36 

 52 

 64 

 79 

 100 



Per cent. 

 29 



Per cent. 

 17 

 29 

 37 

 53 

 67 

 81 

 100 



Per cent. 

 21 

 34 

 44 

 62 

 74 

 84 

 100 



33 



42 

 64 

 69 

 82 

 100 



52 

 70 

 81 

 88 

 100 



69 

 80 

 87 

 100 



The tables show what was to be expected, that relatively more 

 water was required to advance the wetted area in the flume 1 inch 

 near the end of the experiment than at the commencement of the ex- 

 periment. This fact may be partially or wholly due to the loss of 

 water by evaporation. However, from data secured with the vertical 

 flumes it may be partially due to changes in the distribution of mois- 

 ture through the length of the flumes. 



Table 13 gives the average quantity of water, in cubic centimeters, 

 required to advance the moisture in the flume 1 inch for different 

 periods of time. 



Table 13. 



Average use of icater to advance the moisture 1 inch for different 

 period's of time. 



Number 

 of days. 



Flume. 



20 



31 



50 



70 



90 



200 



1 

 3 



5 

 10 

 15 



20 

 30 



c. c. 



c. c. 

 500 

 474 

 461 

 488 

 501 

 552 

 616 



c. c. 

 711 



728 



c. c. 

 259 



c. c. 

 524 

 532 

 537 



545 



. 577 



617 



637 



C. c. 

 300 

 290 

 305 



380 

 384 

 400 

 413 

 422 

 425 



288 

 300 

 320 

 366 



408 



764 

 775 

 778 

 789 



345 

 3S0 









Since these flumes are open to evaporation, more water is required 

 to advance the moisture an inch as the distance . from the tank 

 increases. In some instances the amount of moisture required to 

 advance the wetted area 1 inch at the end of 30 days is nearly double 

 that required the first few days. In the heavier types of soils, as 

 represented by flume 50, a more constant quantity .is required during 

 each of the 30 days than for the lighter soils as represented by flume 

 70. Table 13 indicates also that less water is required to advance 



