Introduction
Water aloft: fluid mechanics of the lower atmosphere
Precipitation
Evaporation
Water on the land surface: fluid mechanics of free surface flow
Overland flow
Streamflow routing
Water beneath the ground: fluid mechanics of flow in porous materials
Infiltration and related unsaturated flows
Groundwater outflow and base flow
Streamflow generation: mechanisms and parameterization
Streamflow response at the catchment scale
Elements of frequency analysis in hydrology
Afterword
a short historical sketch of theories about the water circulation on earth.