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According to DIN 1054 [DIN1054:2005] and because of its different behaviour under load caused by structures, the subsoil is divided into natural soil (cohesive and noncohesive soils as well as organic soils), into rock and into piled ground.

Hydrogeology is the science of the behaviour of water in the underground irrespective of whether the condition of the water is solid (ice), fluid (groundwater) or gaseous. Hydrogeology also includes the interchange between groundwater and surface water (receiving water and bank-filtrated water). In general, water moves in the underground within the cavities or voids of the soil, the fissures and joints of the rock and the cave systems of the karst …