16 
BULLETIN 835, U. S. DEPARTMENT OF AGRICULTURE. 
The diagram indicates that the rate of movement in the lighter soils 
is more rapid for the first few hours and then slows down much 
quicker than with the heavy soils. The heavier soils maintain a 
relatively more uniform variation than the lighter soils throughout 
the experiment. 
The heavy Idaho soil is an excellent example of those soils having 
a high capillary power. It shows a steady extended movement and 
differs widely from the light Idaho soils, as shown by flume 209. 
We find in these soils a variation of nearly 250 per cent in the total 
distance moved in a period of 30 days. In general, the lighter the 
soil, the shorter the distance the moisture will move upward in a long 
period of time. 
The unnumbered dotted lines upon both the drawings in figure 
2 represent the movement of moisture in vertical tubes of small diam- 
eter as found by Loughridge (13). These curves are introduced to 
show the agreement in results from experiments with small tubes and 
those from the experiments with flumes at Eiverside. The soil used 
in these small tubes, as indicated by the dotted lines, is an alluvial 
soil from Gila Eiver Valley. 
Table 1 gives, in percentages, that part of the distance moved in 
1, 2, 3, 5, 10, and 20 days of the total distance moved in 30 days. 
Table 2 gives the same information in hour periods for the first 
24 hours. 
Table 1. — Daily movement of 'moisture (distance) in percentage of movement 
in 30 days. 
Flume. 
Number 
of days. 
19 
43 
63 
80 
100 
209 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
1 
51 
41 
47 
46 
30 
62 
2 
61 
60 
57 
57 
43 
71 
3 
67 
66 
62 
62 
51 
76 
5 
74 
73 
65 
70 
59 
83 
10 
84 
82 
76 
80 
77 
89 
20 
94 
93 
89 
92 
92 
94 
30 
100 
100 
100 
100 
100 
100 
Table 2. — Hourly movement of moisture {distance) in percentage of movement 
in 24 hours. 
Number 
of hours. 
Flume. 
19 
43 
63 
80 
100 
209 
1 
2 
3 
4 
8 
12 
24 
Per cent. 
27 
39 
52 
63 
72 
84 
100 
Per cent. 
15 
25 
45 
57 
70 
80 
100 
Per cent. 
Per cent. 
Per cent. 
14 
29 
Per cent. 
44 
58 
69 
80 
81 
29 
38 
56 
66 
71 
83 
100 
47 
55 
63 
83 
100 
74 
100 
90 
100 
