46 
BULLETIN 835, U. S. DEPARTMENT OF AGRICULTURE, 
slope of the ground has in assisting capillarity to draw water from 
conveying channels and storage reservoirs. 
Table 34. — Quantity of water removed from the tank* at various times, 
expressed in depth, on an area equal to eross seetion of flume. 
Flume. 
Number 
of Says; 
34 
32 
•t 
39 
42 
43 
Inches. 
Inches. 
Inches. 
Inches. . 
Inch es. 
Inches. 
1 
6.11 
o. 65 
6.11 
4.58 
6.11 
4.28 
3 
12.22 
10.99 
9.76 
7.93 
8.54 
6.41 
5 
17.72 
15.26 
11.59 
9.46 
9.76 
6.77 
10 
29.61 
25. 64 
15. 86 
11. 59 
11. 59 
7.56 
15 
4L20 
36.02 
19.22 
13.42 
12.81 
8.54 
20 
53. 40 
47.90 
22.28 
14. 95 
14. .50 
9.16 
40 
91.58 
85.75 
32. 33 
19.05 
18.63 
9.64 
Table 35 gives the number of cubic centimeters of moisture re- 
quired to advance the moisture in the flumes an average distance of 
1 inch at different periods of time. One point worthy of note in this 
table is the fact that flume 43 used about the same quantity of water 
per inch throughout. It must be kept in mind that this flume was 
closed to evaporation and that no water escaped from this tank that 
was not confined within the wetted soil area of the flume. The other 
flumes were all open to evaporation. The figures seem to indicate 
that as we recede from the vertical the quantity of water required 
per inch is less. However, these figures are so confused with the 
evaporation that they do not indicate the true facts as to the require- 
ment of the soil itself when placed at these different angles. The 
evaporation factor is confused, for the reason that the soil within the 
flume contains relatively different percentages of moisture, which 
has an influence upon the quantity of evaporation. Furthermore, 
the wetted area of soil differs so greatly in the several flumes and 
hence that the area exposed to evaporation is much different. 
Table 35. — Average quantity of water required to advanee wetted area in flumes 
1 inch. 
Plume. 
Number 
of davs. 
34 
32 
31 
39 
42 
43 
c.c. 
c.c. 
c.c. 
c.c. 
c.c. 
c.c. 
1 
385 
419 
500 
406 
596 
446 
3 
447 
436 
474 
530 
573 
506 

498 
455 
477 
543 
578 
486 
10 
533 
513 
488 
531 
587 
4S2 
15 
569 
561 
501 
556 
629 
487 
20 
608 
626 
562 
573 
663 
471 
30 
684 
739 
616 
548 
760 
*76 
40 
50 
843 
681 
605 
767 
476 
686 
