The Soil Foam Drainage Equation – revisiting a geometrically-explicit formulation of unsaturated flow

Peter Lehmann, ETH Zurich, Departement of Environmental Systems Science, Zurich, Switzerland, Frouke Hoogland, ETH Zurich, Zurich, Switzerland, Shmuel Assouline, Agricultural Research Organization Volcani Center, Institute of Soil, Water and Environmental Sciences, Bet-Dagan, Israel and Dani Or, ETH Zurich, Department of Environmental Systems Science, Zürich, Switzerland