Results of experiments in progress at Arlington, Va., since 1920, indicate that with deep drainage ditches unobstructed the upper layers of soil contain more moisture than underlying soil, a condition which is reversed by flooding ditches; amount of moisture near surface is increased by alternate freezing and thawing; etc.
Subgrade drainage tests yield interesting preliminary data
Pub. Roads,
Public Roads ; 4 , n 6
1921
5 pages
14 Figs.
Article (Journal)
English
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