CAPILLARY MOVEMENT OE SOIL MOISTURE. 



19 



In Table 5 are brought together for comparison the rate of advance 

 of moisture and the quantity of water used, expressed in percentages 

 of the totals for 30 days. (See Tables 1 and 4.) 



Table 5.- 



-Percentage of. distance moved and percentage of water used by 

 dags upon a 30-day basis. 



Num- 

 ber of 

 days. 



Flume. 



19 



43 



63 



80 100 



209 



Dis- 

 tance 

 moved. 



"Water 

 used. 



Dis- -prater 



tance 'Jff 

 moved. usecu 



8^ ted" 

 moved. usea> 



Dis- 

 tance 

 moved. 



Water ^ s " 



used tance 

 usea - moved. 



Water 

 used. 



Dis- 

 tance 

 moved. 



Water 

 used. 



1 

 2 

 3 



10 

 15 

 20 

 30 



Per ct. 

 51 

 61 



67 

 84 



94 



100 



Per ct . 

 61 

 67 

 74 

 86 

 91 

 95 

 100 



Per ct. 

 41 

 60 

 66 

 82 



93 



100 



Per ct. 

 47 

 66 

 69 

 79 

 86 

 91 

 100 



Per ct. 



47 

 57 

 62 

 76 



89 

 100 



Per ct. 

 40 

 50 

 55 

 74 

 87 

 93 

 100 



Per ct. 



46 

 57 

 62 

 80 



92 



100 



Per ct. 

 34 

 43 



60 

 77 

 82 

 87 

 100 



Per ct. 

 30 

 43 



51 



77 



92 



100 



Per ct. 

 30 

 42 

 53 

 79 

 89 

 92 

 100 



Per ct. 

 62 

 71 

 76 

 89 



Per ct. 

 77 

 82 

 84 



94 



100 



100 



Table 6. — Percentage of 

 looter, by volume, con- 

 tained in the wet so?-. 



It is observed that in three of the flumes the percentage of the 

 water used at the end of the first day exceeds the percentage of the 

 distance moved; in two of the flumes this condition is reversed and 

 in the other flume the two percentages are identical. 



Table 6 shows the percentage of water (by volume) contained in 

 the wet soil at the end of 30 days, and as would be expected, the rela- 

 tively large quantity of water contained in the heavier soils. 



Table 7 gives the depth in inches to which 

 the water removed from the tanks at the end 

 of the specified time would cover the surface 

 of the soil column if none of the water so 

 added penetrated the soil. For instance, at 

 the end of the third day 671 cubic inches of 

 water had been removed from tank 19. This 

 quantity of water is sufficient to cover a 10- 

 inch hj 10-inch area to a depth of 6.71 inches. 

 In the same way the other figures of the 

 table have been determined. If the area of the flume had been 1 

 acre instead of 100 square inches there would have been removed from 

 the tank sufficient water to hare covered the acre to a depth of 6.71 

 inches, or, expressed in irrigation terms, there would have been re- 

 moved from the tank 6.71 acre-inches in the three clays. 



Flume : Percentage 

 .flume. of water. 



19 21. 82 

 43 28. 80 

 63 50. 02 

 80 20. 55 

 100 29. 60 

 209 14. 60 



