title: Methods to derive the differential equation of the free surface boundary.
authors.affiliation: Institute of Environmental Geology, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Chongxi
authors.initials: C
authors.lastname: Chen
authors.forename: Xingxing
authors.initials: X
authors.lastname: Kuang
authors.forename: Jiu Jimmy
authors.initials: JJ
authors.lastname: Jiao
mesh_terms: D008962:Models, Theoretical; D013499:Surface Properties; D014881:Water Supply