WATER PENETRATION IN GUMBO SOILS. 9 
TaBLE II1.—Depth of soil penetrated and total distance from the surface 
reached where water was kept standing for 10 days in holes 8 inches in 
diameter bored to different depths. 
Hole No 
Specification. | 
9 HO ety, ) Tak 12 13 ss ied 16 
Depth of hole..._......._.- inches..| Surface. 6 9 12 15 18 21 24 
Depth of soil penetrated - .-.- do.. 22 15 12 8 7 10 11 11 
Depth below surface to which water 
penetrated. 2) .2..-2..... inches. - 22 21 21 20 22 28 32 35 
Water added at all points within the cracked area penetrated 
almost exactly the same distance. In each case it penetrated through 
the cracked soil and about 7 inches into the compact soil beneath. 
Where water was applied below the cracked area the total distance 
reached by water penetration varied with the depth below the surface 
at which the water was applied. The distance that it penetrated into 
the compact soil was quite uniform. That a constant, though ex- 
ceedingly slow, movement of moisture did take place in the compact 
layer is shown by a comparison of Tables II and III. These show 
that for all the points within the compact layer the depth penetrated 
‘when water was kept standing for 10 days was greater than when 
it stood for a shorter period of time. 
A third experiment was performed in order to determine as nearly 
as possible the rapidity with which water movement takes place 
within this compact layer and the depth in it to which varying 
amounts of water would reach. A third series of borings was made 
to a uniform depth of 18 inches. The amount of water added, the 
time required for the water to disappear, and the depth to which it 
penetrated are shown in Table IV and figure 4. The distance that 
the water penetrated in each case was determined as soon as possible 
after the water disappeared. 
TABLE IV.—Time taken for various quantities of water to disappear and the 
depths of penetration in each case from the bottoms of a series of holes 18 
inches deep. 
Hole No. 
Specification. Tae aE ROR a SETI GS RERRET 7 SSS 
17 18 19 PAD yh AL 22 23 24 
Water added: 
ARG SRE sie eee ani ose Ailes olin 1 2, il aeeeeaee INS BOE TAN mal Bae Nod ah RGU RAN tees corey | ce aR aay 
MUTT S eae MEL ANSE AU Oe RT GOL ao 8 1 1 2 2) 4 a2 
Time required to disappear 
CONDI Cyr i yed es dpmie hal air Sa On Se eal 3 5 32 48 57 AU anand a 
aoe Pe AS ET er eS cE 5 10 | 40 40 SO We oO las at ves upala Pee a 
EET PSSE Gs Ah Sie ei ca ape es Sed On DS IS Sp a Mae FS cess col ale ee ae al ER eI eel aa Qe stl (RMA ele Ye 10 
Depth te enetration below the bot- | | 
tom of the hole ...........: inches. . 5 6 | 3 5 | 54 5s i. 62 
oe of penetration below the sur- | 
Bt Ais vers ia ian hy Meer: Sere, 2 ae UY inches 23 24 21 | 23 234 2334 23 243 
a Three times. 
