juiyi6. I9I7 Movement and Distribution of Moisture in Soil 



149 



falling off occurred when the coarser layers were reached. In the latter 

 soil type an equilibrium was approached fairly rapidly, while in the first 

 there was still an appreciable movement after 1 39 days. 



EFI^ECT OF SOURCE OF WATER SUPPLY 

 In Green viIvLE Loam 



In the discussion of figures 24, 25, and 26 it was pointed out that 

 moisture tends to distribute itself with the greatest content nearest and 

 the least content farthest from the soil acting as source of supply, no 

 matter whether this soil be clay, loam, sand, or different soil types. 



Figure 29, which represents the results of data taken from the experi- 

 ment on the effect of initial percentage on the horizontal distribution 



Perceniage o1 me/sfure ai ^ar/gus. dislances from source of supplj/ 



wilh c/jfferent inifial percenigpes of moisiure 



/nifioL percent in iubes 



iWaS 



5 lb /i h 



i li a io 



Fig. 29— Diagram showing the horizontal distribution of capillary moisture at various distances from the 

 source of supply in Greenville loam with different initial percentages of moisture. The source of supply 

 in each case was Greenville loam with 30.45 per cent of moisture. 



of moisture in soils in contact with a large amount of unsaturated Green- 

 ville loam, shows that no matter whether the movement takes place 

 in soils of low or high initial moisture there is always more moisture near 

 the source of supply than farther away. The figure shows that the differ- 

 ence between the nearest and the most remote sections is practically 

 the same, irrespective of the original moisture content. 



In Different Soil Types 



These data were taken from the experiment on the effect of soil types 

 where moisture moved horizontally from Greenville loam into different 

 soil types. 



Figure 30 shows the variation in the content of different soil types at 

 different distances from the tub containing tlie moist Greenville loam. 

 Here, again, are brought out the points illustrated in figures 24, 25, 26, 



