According to DIN 18533-1, non-pressurized water can be assumed to be the decisive water effect for the waterproofing from the outside under the following conditions:
- the design water level (groundwater or flood) is at least 50 cm below the lowest waterproofing level,
- in the case of highly permeable soils (k > 10-4 m/s according to DIN 18130-1), both the subsoil and the backfill material of the work rooms consist of highly permeable soils up to a sufficient depth below the waterproofing level; Precipitation water can seep freely from the ground surface to the groundwater and cannot accumulate temporarily, e.g. after heavy rainfall,
- in less permeable soils (k ≤ 10-4 m/s according to DIN 18130-1) there is no strata water and surface and seepage water is drained off via a functional drainage system according to DIN 4095.
According to DIN 18533-1, non-pressurised water is assigned to water exposure class W1.1-E (for highly permeable soils) or W1.2-E (for less permeable soils in combination with drainage).
Source: bauwion
