Drainage (Water Overlay)
Drainages provide connections between the underground 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.
A drainage is an area-based construction.
|DRAINAGE_Q||m3/m2 per second||The drain capacity per second, where the capacity is defined in cubic meters per square meter.||0.01|
|DRAINAGE_DATUM||datum||The datum height of the drainage.||n/a|
|DRAINAGE_ACTIVE||boolean||Whether the drainage is actively pumped.||False|
|DRAINAGE_OVERFLOW_THRESHOLD||m + datum||The threshold of the water end-point of the drainage.||n/a|
- 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.