The authors conducted laboratory tests to study water movement during infiltration in compacted clay and to determine the suction head at the wetting front as defined in the Green-Ampt infiltration equation. Two clays having low and high plasticity indices were used in the tests. Results indicate that the wetting front is diffuse and becomes increasingly so as it penetrates deeper into the soil. Also, the wetting front is more diffuse for molding water contents near or wet of optimum water content and for clay with higher plasticity index. As the wetting front penetrates the soil, the suction head at the wetting front decreases with the rate of dissipation depending on the modeling water content and soil type. For the clay with low plasticity index, the initial suction head at the wetting front was largest and decreased the fastest when the molding water content was near optimum. For high plasticity index clay, similar initial suction head and rate of dissipation were measured at various molding water contents. To estimate the suction head at the wetting front using the air-entry pressure, soil-specific equations are offered.


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Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 713-722
  • Serial:

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Filing Info

  • Accession Number: 00711632
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 30 1995 12:00AM