Formerly the Kerbernez site was devoted to an agronomic study that has aimed at quantifying the crop yield and the soil evolution under variable agricultural and crop practices. A field was divided in 16 plots in 1978; each plot was cultivated with corn with organic fertilization (manure), corn with mineral fertilization, permanent meadow and rotation cereal/corn. In 1989, lysimeters were installed in another field cultivated with grassland grazed by dairy cows to quantify nitrate leaching in soil. Since 1992 nitrate and chloride concentrations were monitored at twelve locations along the stream network of the Kerbernez site. Hydrometric instruments to monitor intensively stream water and groundwater levels and chemistry were set up in 1998 in three catchments, Le Puits and two of its sub-catchments, Kerbernez and Kerrien.