title: Approximate discharge for constant head test with recharging boundary.
abstract: The calculation of the discharge to a constant drawdown well or tunnel in the presence of an infinite linear constant head boundary in an ideal confined aquifer usually relies on the numerical inversion of a Laplace transform solution. Such a solution is used to interpret constant head tests in wells or to roughly estimate ground water inflow into tunnels. In this paper, a simple approximate solution is proposed. Its maximum relative error is on the order of 2% as compared to the exact analytical solution. The approximation is a weighted mean between the early-time and late-time asymptotes.
authors.affiliation: Centre for Hydrogeology, University of Neuchâtel, 11 rue Emile Argand, Neuchâtel, CH 2000 Switzerland. philippe.renard@unine.ch
authors.forename: Philippe
authors.initials: P
authors.lastname: Renard
mesh_terms: D008962:Models, Theoretical; D014872:Water Movements; D014881:Water Supply