Sewer overflow (Water Overlay)
Sewer overflows are points where water is moved from the sewer area to the above-ground water system. A sewer overflow will allow water to flow through if the water in the sewer exceeds the SEWER_OVERFLOW_THRESHOLD, and the water in the connected sewer exceeds the height of the terrain at the location of the sewer overflow. It will then function for all sewers part of that sewer area.
A sewer overflow is a point-based constructions. It must intersect with a sewer area, but does not need to intersect with an actual sewer. {{Overlay attribute |attributeSEWER_OVERFLOW |unit=m + datum |description=The height of the bottom of the sewer, relative to the average terrain height of the connected sewer. Starting from this height, the water height in the sewer must exceed the height of the terrain at the location of the overflow in order for water to flow out. |defaultvalue=n/a |icon= |attribute2=SEWER_OVERFLOW_SPEED |unit2=m3/s |description2=The maximum speed at which water can flow out from the sewer through this overflow. |defaultvalue2=10 |icon= |} Note that at most one overflow can exist per sewer area.