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Hillslope drainage with sudden drawdown: Closed form solution and laboratory experiments
Author(s) -
Sanford William E.,
Parlange J.Yves,
Steenhuis Tammo S.
Publication year - 1993
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 - 10.1029/93wr00515
Subject(s) - aquifer , drawdown (hydrology) , outflow , hydraulic conductivity , geology , water table , geotechnical engineering , drainage , slug test , flow (mathematics) , aquifer test , hydrology (agriculture) , porosity , volumetric flow rate , soil science , mechanics , groundwater , soil water , groundwater recharge , ecology , oceanography , physics , biology
Theory is developed for hillslope drainage and is applied to the condition of sudden drawdown at the aquifer outlet. The equations for prediction of cumulative outflow volume, flow rate, and water table profile are based on the Boussinesq approximation for subsurface water flow above a sloping impermeable layer. The advantages of the theory presented here are that the assumption of a long, thin aquifer is unnecessary; the same equations apply to both sloping and horizontal aquifers; and the equations contain only parameters that are easily measured or estimated: slope, drainable porosity, saturated hydraulic conductivity, and layer thickness. The accuracy of the outflow equations is illustrated by a series of laboratory experiments.