Overvannsinnstrømning

Overvannsinnstrømning refers to the unwanted entry of surface water into underground structures, most commonly sewer systems and building basements. This phenomenon is a significant concern in urban areas, especially during periods of heavy rainfall or snowmelt. The primary source of this water is precipitation that accumulates on impermeable surfaces such as roads, rooftops, and parking lots.

When rainfall is intense or prolonged, the capacity of the storm drainage system can be overwhelmed. Excess surface water then seeks alternative paths, which can include infiltration through cracks in manhole covers, pipe joints, or other structural deficiencies in the sewer network. Similarly, it can seep into basements through foundation cracks, faulty waterproofing, or inadequate drainage around a building.

The consequences of overvannsinnstrømning can be severe. In sewer systems, it dilutes the wastewater, reducing the efficiency of treatment plants and potentially leading to combined sewer overflows (CSOs) where untreated sewage is released into receiving waters. For buildings, basement flooding can cause significant property damage, mold growth, and health hazards. Addressing overvannsinnstrømning often involves improving the capacity and integrity of storm drainage systems, implementing green infrastructure solutions to manage stormwater runoff, and ensuring proper waterproofing and drainage around buildings.