The time that water takes to travel through the terrestrial hydrological cycle and the critical
zone is of great interest in Earth system sciences with broad implications for water quality …

Water transit time is now a standard measure in catchment hydrological and ecohydrological
research. The last comprehensive review of transit time modeling approaches was …

We discuss a recent theoretical approach combining catchment‐scale flow and transport
processes into a unified framework. The approach is designed to characterize the …

Mathematical models of varying complexity have been developed since the 1960s to
interpret environmental tracer concentrations in groundwater flow systems. This review …

Mountain water resources are considered to be the world's water towers. Still, despite their
importance for downstream societies and ecosystems and their vulnerability to climate …

Environmental tracers have been extensively used to get characteristic groundwater
velocities. When sampled in discharge zones, we show that they can also be efficiently used …

Apparent ages obtained from the measured concentrations of environmental tracers have
the potential to inform recharge rates, flow rates, and assist in the calibration of groundwater …

Groundwater residence time is a fundamental property of groundwater to understand
important hydrogeological issues, such as deriving sustainable abstraction volumes, or, the …

This review presents the physical mechanisms generating residence time distributions
(RTDs) in hydrologic systems with a focus on steady-state analytical solutions. Steady-state …

Not just the quantities but also the transit times are of crucial importance for understanding
the transfer of water through a catchment. This information is essential, for example, for …