Discharge method (Watershed Overlay): Difference between revisions
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! Description | ! Description | ||
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| HEIGHT_MINIMA | | {{Anchor|HEIGHT_MINIMA|HEIGHT_MINIMA}} | ||
| Restricted to absolute height data. Flow is directed to cells of lower height. For each local height minimum a watershed is created. | | Restricted to absolute height data. Flow is directed to cells of lower height. For each local height minimum a watershed is created. | ||
|- | |- | ||
| WATER_TERRAINS | | {{Anchor|WATER_TERRAINS|WATER_TERRAINS}} | ||
| Restricted to directional data. Each water polygon starts as a unique discharge area. | | Restricted to directional data. Each water polygon starts as a unique discharge area. | ||
|- | |- | ||
| SPECIFIC_AREAS | | {{Anchor|SPECIFIC_AREAS|SPECIFIC_AREAS}} | ||
| Restricted to directional data. Only water cells that intersect with a defined discharge area start as that discharge area. An additional step is added to the watershed algorithm, where discharge areas are expanded to include neighboring unassigned water cells. Discharge area can also expand to water cells that are connected by culverts. After this step, some water cells can still be unassigned. Depending on the option [[Discharge remaining water (Watershed Overlay)|Discharge remaining water]], the remaining connected water cells are assigned to newly created discharge areas. | | Restricted to directional data. Only water cells that intersect with a defined discharge area start as that discharge area. An additional step is added to the watershed algorithm, where discharge areas are expanded to include neighboring unassigned water cells. Discharge area can also expand to water cells that are connected by culverts. After this step, some water cells can still be unassigned. Depending on the option [[Discharge remaining water (Watershed Overlay)|Discharge remaining water]], the remaining connected water cells are assigned to newly created discharge areas. | ||
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Latest revision as of 13:13, 13 October 2026
The discharge method can be configured to the following settings:
| Option | Description |
|---|---|
| HEIGHT_MINIMA | Restricted to absolute height data. Flow is directed to cells of lower height. For each local height minimum a watershed is created. |
| WATER_TERRAINS | Restricted to directional data. Each water polygon starts as a unique discharge area. |
| SPECIFIC_AREAS | Restricted to directional data. Only water cells that intersect with a defined discharge area start as that discharge area. An additional step is added to the watershed algorithm, where discharge areas are expanded to include neighboring unassigned water cells. Discharge area can also expand to water cells that are connected by culverts. After this step, some water cells can still be unassigned. Depending on the option Discharge remaining water, the remaining connected water cells are assigned to newly created discharge areas. |
Notes
- The HEIGHT_MINIMA option without the use of discharge areas can quickly create too many watersheds.
See also
- Group
- Structures
- Discharge area • Culvert
- Overlay