CAPILLARY MOVEMENT OF SOIL MOISTURE. 



43 



The striking feature -of Table 32 is the fact that as the flumes re- 

 cede from the vertical the rate of movement day by day is more uni- 

 form and more constant. In the flume inclined downward at an 

 angle of 30° the extent of movement of moisture on the fifteenth da}' 

 or one-half the time was 65 per cent of the total movement of the 

 moisture in 30 days. In flume 32 this percentage was 68. In flume 

 31 or the horizontal flume it was 81 per cent; in flume 39 it was 83 

 per eent; and in the flume with a vertical angle of 45° it was 92 per 

 cent. 



To present the above data in a more condensed form, figure 7 has 

 been prepared. 



of 75 day. 





Fig. 7. — Comparison of rate of movement of moisture in flumes of various slopes ; all 

 fumes containing Riverside heavy decomposed granite loam. Also shows appearance 

 of moisture curves from top to bottom of flumes, except Nos. 32 and 39. 



Figure 7 shows the relative positions of the moisture in the 

 various flumes with reference to the surface of the water in the tanks 

 at various times during the experiment. The lines on the drawing 

 showing the direction of the flumes represent the longitudinal axes 

 of the flumes along their center lines. The figures show the direc- 

 tions and the paths through which the moisture from the tanks must 

 travel along the center lines of the flumes. It is obvious that during 

 the forepart of the experiment the lines joining the points represent- 

 ing the positions of the moisture on the different dates are very ir- 

 regular. It shows that there is a tendency of the curve joining these 



