WATER INFILTRATION AND RUNOFF UNDER RAIN APPLICATIONS

In the study described a physically based model for describing infiltration into a homogeneous deep stable soil profile with uniform initial water content distribution is presented. The derivation of the model is based on the concept of mapping the actual wetted soil zone into an equivalent rectangular saturated zone with constant effective hydraulic conductivity and capillary pressure head at the abrupt wetting front. The model takes into account the initial water mobility in the soil profile and predicts the system response under any rainfall pattern. The proposed model is further simplified, for practical purposes, by grouping three basic input parameters into a single parameter, the Surface Saturation Index. The validity of the model was tested and strongly supported by the results of laboratory experiments conducted on samples of three soils, two silt loams and a silty clay loam, under five different (variable and constant) water application rate patterns.

  • Corporate Authors:

    Soil Science Society of America

    677 South Segoe Road
    Madison, WI  USA  53711
  • Authors:
    • Hachum, A Y
    • Alfaro, J F
  • Publication Date: 1977-9

Media Info

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Filing Info

  • Accession Number: 00176824
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jun 28 1978 12:00AM