Although floods and landslides occur over a short time period, these events disturb the functioning of the soil, and their causes are related to the soil system. Variations of soil moisture and time variant soil properties are key variables in feedback mechanisms in flood genesis and occurrence of landslides, as are spatial heterogeneity and connectivity. Agents of change, such as socio-economic-political processes, agricultural activities, and climate change, affect the soil system and can cause changes in flood and landslide generation, especially at small and medium catchment scales. The study and management of the soil system is therefore of crucial importance.