Flow

Data data.flow

Where rain would run: Flow is bright along streams and rivers (the area draining through each point, on a log scale), Direction is the way water flows (0..1 = 0..360°, 0° = +X), and Basins gives each drainage basin its own value. Pits fill until they spill; water leaves at the world's edges.

Output with default settings, rendered by LibreTerrain.

Inputs

Port	Type
Terrain	Heightfield

Outputs

Port	Type
Flow	Mask
Direction	Mask
Basins	Mask

Settings

Setting	Default	Range / options	Description
Method	D-infinity (smooth)	D-infinity (smooth), D8 (single path)	D-infinity splits water between two downhill neighbours, so flow spreads on open slopes; D8 sends it all one way, giving sharp single-cell streams.
Detail size	8 m	1 to 1,000 m	Cell size water is routed at, in metres: about the width of the smallest streams. Smaller is slower. The result is the same at any preview or build resolution.

See also

Aspect · Curvature · Distance · Height Mask · Occlusion · Rock Hardness · Select Range · Slope · Wetness