CAPILLARY MOVEMENT OF SOIL MOISTURE. 
23 
of such measurements. The vertical element is the distance meas- 
ured from the surface of the water in the tank and the horizontal 
element is the time in days. 
The resulting 
curves for all these 
soils have the para- 
bolic form. Very 
rapid movement of 
the moistures occurs 
for the first few 
days, after which 
the rate of move- 
ment is more uni- 
form,, but it grad- 
ually decreases with 
the lapse of time. 
It is observed from 
the figure that the 
rate of movement of 
moisture in the heav- 
ier soils, as typified 
by the Whittier soil, 
subsides much more 
rapidly than does 
the movement in the 
sandier soils. 
The extent of 
movement of mois- 
ture in these soils is, 
with the exception of 
Idaho lava soil, in 
inverse order to their 
moisture equivalents. 
That is, the Idaho 
soil (sandy) with 
the lowest moisture 
equivalent showed 
the greatest move- 
ment of moisture, 
while the Whittier 
soil with the great- 
est moisture equivalent showed the least movement of moisture. The 
Idaho lava soil in the horizontal flume as in the vertical flume showed 
a greater movement of moisture than the moisture equivalent would 
indicate. 
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Fig. 3. — Rate of movement of moisture In horizontal open 
flumes. Figures in circles indicate points at which that 
number of liters of water had been taken up. The 
dotted line for flume No. 71 ( covered) is for comparison 
with flume No. 70 (open). 
