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Surface infiltration means that runoff from impermeable surfaces (e.g. roofs) is drained on a permeable grassed area. There, the water infiltrates into the soil without retention and the main portion evaporates. Surface infiltration is especially suitable for small areas such as yards and low- traffic areas (infiltration into adjacent green space). Surface infiltration requires:

  • Good infiltration characteristics of soil (permeability coefficient of 10-3 - 10-5 m/s)
  • low slope of the surface infiltration area
  • low pollution of runoff
  • sufficient distance to groundwater level
  • sufficient distance from buildings (protection from  wetness)

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