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Published in Soil Sci Soc Am J 44:892-898 (1980)
© 1980 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils1

M. Th. van Genuchten2

ABSTRACT

A new and relatively simple equation for the soil-water content-pressure head curve, {theta}(h), is described in this paper. The particular form of the equation enables one to derive closed-form analytical expressions for the relative hydraulic conductivity, Kr, when substituted in the predictive conductivity models of N.T. Burdine or Y. Mualem. The resulting expressions for Kr(h) contain three independent parameters which may be obtained by fitting the proposed soil-water retention model to experimental data. Results obtained with the closed-form analytical expressions based on the Mualem theory are compared with observed hydraulic conductivity data for five soils with a wide range of hydraulic properties. The unsaturated hydraulic conductivity is predicted well in four out of five cases. It is found that a reasonable description of the soil-water retention curve at low water contents is important for an accurated prediction of the unsaturated hydraulic conductivity.

NOTES

1 Contribution from the U. S. Salinity Laboratory, AR-SEA, USDA, Riverside, CA 92501.

2 Soil Scientist, Dep. of Soil and Environmental Sciences, University of California, Riverside, CA 92521. The author is located at the U. S. Salinity Lab., 4500 Glenwood Dr., Riverside, CA 92502.

Received for publication June 29, 1979. Accepted for publication May 19, 1980.




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R. W. Healy
Simulating Water, Solute, and Heat Transport in the Subsurface with the VS2DI Software Package
Vadose Zone J., May 27, 2008; 7(2): 632 - 639.
[Abstract] [Full Text] [PDF]

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 Vadose Zone JHome page
M. D. White, M. Oostrom, M. L. Rockhold, and M. Rosing
Scalable Modeling of Carbon Tetrachloride Migration at the Hanford Site Using the STOMP Simulator
Vadose Zone J., May 27, 2008; 7(2): 654 - 666.
[Abstract] [Full Text] [PDF]

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D. Jacques, J. Simunek, D. Mallants, and M.Th. van Genuchten
Modeling Coupled Hydrologic and Chemical Processes: Long-Term Uranium Transport following Phosphorus Fertilization
Vadose Zone J., May 27, 2008; 7(2): 698 - 711.
[Abstract] [Full Text] [PDF]

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H. Class, R. Helmig, and I. Neuweiler
Sequential Coupling of Models for Contaminant Spreading in the Vadose Zone
Vadose Zone J., May 27, 2008; 7(2): 721 - 731.
[Abstract] [Full Text] [PDF]

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 Vadose Zone JHome page
R. A. Hodges and R. W. Falta
Vertical Confinement of Injected Steam in the Vadose Zone Using Cold Air Injection
Vadose Zone J., May 27, 2008; 7(2): 732 - 740.
[Abstract] [Full Text] [PDF]

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A. Furman
Modeling Coupled Surface-Subsurface Flow Processes: A Review
Vadose Zone J., May 27, 2008; 7(2): 741 - 756.
[Abstract] [Full Text] [PDF]

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N. K. C. Twarakavi, J. Simunek, and S. Seo
Evaluating Interactions between Groundwater and Vadose Zone Using the HYDRUS-Based Flow Package for MODFLOW
Vadose Zone J., May 27, 2008; 7(2): 757 - 768.
[Abstract] [Full Text] [PDF]

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P. E. V. van Walsum and P. Groenendijk
Quasi Steady-State Simulation of the Unsaturated Zone in Groundwater Modeling of Lowland Regions
Vadose Zone J., May 27, 2008; 7(2): 769 - 781.
[Abstract] [Full Text] [PDF]

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J. Simunek and M. Th. van Genuchten
Modeling Nonequilibrium Flow and Transport Processes Using HYDRUS
Vadose Zone J., May 27, 2008; 7(2): 782 - 797.
[Abstract] [Full Text] [PDF]

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R. Kodesova, M. Kocarek, V. Kodes, J. Simunek, and J. Kozak
Impact of Soil Micromorphological Features on Water Flow and Herbicide Transport in Soils
Vadose Zone J., May 27, 2008; 7(2): 798 - 809.
[Abstract] [Full Text] [PDF]

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 Vadose Zone JHome page
B. Hanson, J. W. Hopmans, and J. Simunek
Leaching with Subsurface Drip Irrigation under Saline, Shallow Groundwater Conditions
Vadose Zone J., May 27, 2008; 7(2): 810 - 818.
[Abstract] [Full Text] [PDF]

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J. Sansoulet, Y.-M. Cabidoche, P. Cattan, S. Ruy, and J. Simunek
Spatially Distributed Water Fluxes in an Andisol under Banana Plants: Experiments and Three-Dimensional Modeling
Vadose Zone J., May 27, 2008; 7(2): 819 - 829.
[Abstract] [Full Text] [PDF]

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 Vadose Zone JHome page
G. Langergraber
Modeling of Processes in Subsurface Flow Constructed Wetlands: A Review
Vadose Zone J., May 27, 2008; 7(2): 830 - 842.
[Abstract] [Full Text] [PDF]

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 Vadose Zone JHome page
J. A. Vrugt, P. H. Stauffer, Th. Wohling, B. A. Robinson, and V. V. Vesselinov
Inverse Modeling of Subsurface Flow and Transport Properties: A Review with New Developments
Vadose Zone J., May 27, 2008; 7(2): 843 - 864.
[Abstract] [Full Text] [PDF]

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 J. Environ. Qual.Home page
M. Larsbo, K. Fenner, K. Stoob, M. Burkhardt, K. Abbaspour, and C. Stamm
Simulating Sulfadimidine Transport in Surface Runoff and Soil at the Microplot and Field Scale
J. Environ. Qual., May 1, 2008; 37(3): 788 - 797.
[Abstract] [Full Text] [PDF]

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 J. Environ. Qual.Home page
R. M. T. Webb, M. E. Wieczorek, B. T. Nolan, T. C. Hancock, M. W. Sandstrom, J. E. Barbash, E. R. Bayless, R. W. Healy, and J. Linard
Variations in Pesticide Leaching Related to Land Use, Pesticide Properties, and Unsaturated Zone Thickness
J. Environ. Qual., May 1, 2008; 37(3): 1145 - 1157.
[Abstract] [Full Text] [PDF]

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G. Gargiulo, S. A. Bradford, J. Simunek, P. Ustohal, H. Vereecken, and E. Klumpp
Bacteria Transport and Deposition under Unsaturated Flow Conditions: The Role of Water Content and Bacteria Surface Hydrophobicity
Vadose Zone J., May 1, 2008; 7(2): 406 - 419.
[Abstract] [Full Text] [PDF]

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A. C. Resurreccion, P. Moldrup, K. Kawamoto, S. Yoshikawa, D. E. Rolston, and T. Komatsu
Variable Pore Connectivity Factor Model for Gas Diffusivity in Unsaturated, Aggregated Soil
Vadose Zone J., April 14, 2008; 7(2): 397 - 405.
[Abstract] [Full Text] [PDF]

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 Waste Manag ResHome page
J.-P. Franzidis, M. Heroux, M. Nastev, and C. Guy
Lateral migration and offsite surface emission of landfill gas at City of Montreal landfill site
Waste Management Research, April 1, 2008; 26(2): 121 - 131.
[Abstract] [PDF]

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 Vadose Zone JHome page
A. Saintenoy, S. Schneider, and P. Tucholka
Evaluating Ground Penetrating Radar Use for Water Infiltration Monitoring
Vadose Zone J., February 25, 2008; 7(1): 208 - 214.
[Abstract] [Full Text] [PDF]


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