Drainage (Water Overlay)

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Drainages provide connections between the saturated ground layer and nearby waterways, draining groundwater to levels which are optimal for agriculture. Drainage can be passive, where water drains based on water head differences, or active, where the water is pumped from the drain to the nearby waterway.

Waterwizard icon drainage.png A drainage is an area-based building.


  • A drainage should have a part that overlaps with land and a part that overlaps with water. These should be two separate polygons. Neither polygon should overlap with the edge of the waterway.


See also