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The stable isotopes oxygen-18 (18O) and deuterium (2H) are naturally abundant in precipitation. Due to fractionation effects, a seasonally variable distribution of water isotopes occurs in the precipitation of temperate and continental regions. Water isotopes, being conservative tracers, are ideal for investigating subsurface flow processes. They reveal information about soil water fluxes like evaporation, transpiration, downward infiltration and others that are difficult to determine by other techniques. We are u...