3.2.2 Soil saturation
According to the measurement of soil water tension, the soil was already saturated, at 15, 30 and 45 cm of depth in mid-November. It stayed saturated at all the depth until mid-March. A short period at the mid of January is characterised by a slight decrease of the water tension in the topsoil, due to ten days without rainfall. Moreover, between mid-November (date of installation of the Mini-diver® probes) and mid-March, the saturated zone is at 30 cm or higher below the soil surface during 75% of the time.