University of California

Water conduction from shallow water tables


Ross E. Moore

Author Affiliations

Ross E. Moore was Instructor in Soil Technology and Junior Soil Technologist in the Experiment Station.

Publication Information

Hilgardia 12(6):383-426. DOI:10.3733/hilg.v12n06p383. March 1939.

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The phenomenon of the flow of liquids through porous mediums without the application of external force and without complete filling of the pores of the solid with liquid, has long been recognized and studied. It was early recognized that the forces involved are those of adhesion and cohesion, the same as those responsible for the action of liquids in capillary tubes. The term “capillarity” (6), (17)4 has thus come to apply to the flow of liquids through porous mediums.

Many analyses (28)-(31) have been made for the purpose of evaluating the capillary forces acting in three-phase systems, such as is the case in moist soil, consisting of solid, liquid, and gas, by assuming spherical solid particles of uniform size and sequence of packing arrangement. While this assumption has presented concepts of value in comprehending the mechanism involved in capillary flow, the size and configuration of the solid and liquid phases are very complex in even the most idealized systems, and become indeterminate when applied to natural bodies such as soil.

The capillary potential concept, introduced by Buckingham (6) in 1907, assumed a capillary force field generated by the attraction of moist soil for water. He defined a capillary potential, the gradient of which is equal in magnitude to the capillary force.

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Moore R. 1939. Water conduction from shallow water tables. Hilgardia 12(6):383-426. DOI:10.3733/hilg.v12n06p383

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Machinery for soil drainage: Comparative analyses made of production volumes of various earthmoving machinery used for preparing land for drainage

Zinc deficiency in the avocado: Application of zinc chelates to soils may solve the zinc problem in trees on land too steep for spray rig operation

Fertilizers for timber trees: Exploratory greenhouse investigations show varying responses of timber trees to soils and to applications of fertilizers

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Potato fertilization and internal black spot in Santa Maria Valley: Deficiency of important nutrient found to exist in soils of many potato fields during survey and fertilizer experiments

Meat in retail grocery stores: Availability of fresh meats, frozen meats, and cold cuts in stores surveyed influenced by store size, ownership, location

Vinegar fly control treatments: Effectiveness of insecticide formulations and of inert dust diluents assayed in laboratory studies using fruit crop pest

Soil macrostructure as affected by cultural treatments

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