32 
BULLETIN 835, U. S. DEPARTMENT OF AGRICULTURE. 
Table 17. — Comparative movement of moisture, 
in percentages of movement in flume 34- 
any other flumes, although flume 94 maintained nearly the same rate 
after the first day. In view of the fact that these flumes were oper- 
ated at different seasons of the year, it is not possible to say to what 
extent the variable me- 
teorological conditions 
might have influenced 
the results. 
In Table 18 there is 
shown for each flume 
the percentage of the 
total distance moved in 
30 days that had been 
moved in 1, 3, 5, 10, 15, 
and 20 days. 
Table 18 shows in an- 
other way what has been 
previously stated. The heavier soil and less porous soils show a rel- 
atively greater percentage of movement of moisture the first day or 
two and a relatively slower rate of movement the last few days. The 
lighter and more porous soils show the more uniform and more ex- 
tended movement of the moisture. It is found that in all the flumes, 
in 5 days, or one-sixth of the 30 days, more than one-third of the 
total 30-day distance was traveled; in 10 days, or one-third of the 
time, more than one-half the distance has been traveled, and in 20 
days, or two-thirds of the time, more than four-fifths the distance 
has been covered. 
In the discussion previously given of these flumes only the 30- day 
limit of time was used. However, in figure 4 the curve for flume 
54, the heavy Whittier soil, 
Flume. 
Number 
of days. 
4 
34 
54 
74 
94 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
1 
Ill 
100 
41 
85 
82 
3 
111 
100 
42 
87 
85 

108 
100 
39 
87 
87 
10 
102 
100 
34 
79 
83 
15 
99 
100 
31 
78 
78 
20 
30 
100 
100 
29 
27 
78 
75 
78 
80 
Table IS. — Movement of moisture oy 
days, in percentages of total move- 
ment in 30 days. 
shows that after 30 days the 
rate of movement of the mois- 
ture continues to grow less and 
less every day. although there is 
considerable uniformity in the 
rate of decrease of movement. 
The figures would indicate that 
the movement of moisture 
would reach a considerably 
greater distance than that 
shown upon the figure. It is 
seen that in flume 74 (Upland soil) after 47 days the rate of movement 
of the moisture is not much less than it was at 30 days, and the evi- 
dence is that the moisture would continue to move in this flume rather 
indefinitely ; especially would this be true were evaporation prevented. 
Number 
of days. 
Flume. 
34 
54 
74 
94 
1 
3 
5 
10 
15 
20 
30 
Per cent. 
14 
28 
32 
50 
65 
79 
100 
Per cent. 
22 
37 
46 
62 
74 
85 
100 
Per cenr. 
16 
•29 
68 
82 
100 
Per cent. 
15 
26 
35 
52 
65 
80 
100 
