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The dependence of the parameters in the Green and Ampt Infiltration Equation on the initial water content in draining and wetting states
Author(s) -
Aggelides S.,
Youngs E. G.
Publication year - 1978
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr014i005p00857
Subject(s) - infiltration (hvac) , wetting , pressure head , soil science , richards equation , water content , geotechnical engineering , soil water , hydraulic head , materials science , environmental science , geology , thermodynamics , composite material , physics
The parameters in the Green and Ampt infiltration equation were determined from infiltration experiments in a sand column at various uniform initial water contents in both draining and wetting states and were compared with various estimates obtained from the soil water properties measured on the same experimental column. The estimates of the soil water pressure head at the wetting front were generally more negative than the values obtained from the directly measured parameters. It was found that the calculated cumulative infiltration as a function of time was fitted better by using Bouwer's crude ‘water entry’ estimate than values deduced by approximating Richards' flow equation.