Abstract
AbstractSteady-state water tables above parallel lines of cylindrical drains in an infinitely deep soil with uniform surface rainfall were modeled using a computer package that considers the flow in both the groundwater and unsaturated soil regions. The results were compared with analytical results obtained using a hodograph solution that considers only the groundwater region and assumes that the flux through the water table is equal to the surface input. Steady-state water tables above horizontal drains at the level of an impermeable floor were also modeled and compared with previous analytical results. Agreement of modeled and theoretical results was obtained in both drainage cases when the drainage was modeled for both sand and silty clay soils using a model for soil-water relationships that does not include an air-entry value in their soil-water characteristics. Water tables were lower than the analytical values when simulations were undertaken with sand and silty clay soils with characteristics descr...
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