Water pressing from the outside can occur in the form of backwater, groundwater or flooding. According to DIN 18533-1, pressurized water is present if
- the design water level (groundwater or flood) is less than 50 cm below the lowest sealing level,
- backwater can temporarily accumulate in the form of surface and seepage water, e.g. after heavy rainfall,
- in the case of poorly permeable soils (k ≤ 10-4 m/s according to DIN 18130-1), backwater is present in the form of strata water, or
- in the case of less permeable soils, backwater in the form of surface and seepage water is not discharged via a functional drainage system in accordance with DIN 4095.
According to DIN 18533-1, pressurized water is assigned to water exposure class W2.1-E (moderate impact, ≤ 3 m immersion depth) or W2.2-E (high impact, > 3 m immersion depth) depending on its exposure.
Source: bauwion
