This session emphasizes on coupled modeling and measurements of water flow and chemical transport properties in soil systems at different scales. Experimental studies on water and chemical mobility and fate in both soil column and field studies together with the application of equilibrium and non-equilibrium flow and transport models are presented. The session highlights links between non-equilibrium and preferential transport including model sensitivity to meteorological data. The role of the soil root zone and the groundwater zone, providing input and output of water and chemical fluxes and forming upper and lower boundaries for the soil critical zone is illustrated.