Breach (Water Overlay): Difference between revisions
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*[[How to add a breach with external area manually]] | *[[How to add a breach with external area manually]] | ||
*[[How to add a breach with input area manually]] | *[[How to add a breach with input area manually]] | ||
*[[How to add a breach level area to a breach]] | |||
*[[How to import a breach with input area]] | *[[How to import a breach with input area]] | ||
*[[How to set dynamic breach height]] | *[[How to set dynamic breach height]] | ||
Revision as of 17:18, 18 January 2023
A Breach area can be used to simulate a breach in a levee or dam. It is identified via the BREACH_HEIGHT attribute. Water flowing through the breach originates from a body of water. This body of water can be defined as an input area in the project or a conceptual external water body existing outside the project area. Water can flow through the breach from the input water body to the defined Breach area, and vice versa.
Attributes
| Icon | Key | Unit | Range | Description | Default value |
|---|---|---|---|---|---|
 |
BREACH_HEIGHT | m + datum | The new terrain height at the location of the breach. | n/a | |
 |
BREACH_WIDTH | m | The initial width of the breach. | 10000 | |
 |
BREACH_ANGLE | geo angle (0-360°) | -1.7976931348623157E308 to 1.7976931348623157E308 | The angle at which water flows out through the breach. | n/a |
 |
BREACH_COEFFICIENT | coefficient | The flow coefficient related to the shape of the breach. | 1.37 | |
 |
BREACH_SPEED | m/s | The critical speed factor in the breach width grow-formula (e.g. 0.2 for sand and 0.5 for clay). | n/a | |
 |
BREACH_INPUT_AREA | ID of an Area | The Area item representing the influx area for the breach. | none | |
 |
BREACH_LEVEL_AREA | ID of an Area | The Area item representing the downstream water level measurement area for the breach. | none | |
 |
EXTERNAL_SURFACE_LEVEL | m + datum | The height of the bottom of the external water body behind the breach. The lowest level the external water level can lower to. | 0 | |
 |
EXTERNAL_WATER_LEVEL | m + datum | The water level of the external water body behind the breach. The initial level the water level is set to. | 0 | |
 |
EXTERNAL_AREA | m² | The surface area of the external water body behind the breach. The larger the external water body, the more water can flow from it (or into it), and the smaller the effect of the inflow or outflow of water on the external water level. When provided with a second value, this key will also define a bottom area for the external water body, transforming its cross-section from a rectangle to a trapezoid. | n/a |
Overlay attributes
| Icon | Attribute | Unit | Range | Description | Default value |
|---|---|---|---|---|---|
 |
BREACH_MEASUREMENT_DISTANCE_M | m | Distance from the breach area to the automatically placed measurement point for the downstream water level of the breach, in the direction of the breach. | 100 |
How-to's
- How to add a breach with external area manually
- How to add a breach with input area manually
- How to add a breach level area to a breach
- How to import a breach with input area
- How to set dynamic breach height
- How to visualize multiple sequential breaches (Water Overlay)
- How to inspect breach output attributes of an overlay using the measurement tool
Videos
See also
- Group
- Water area
- Breach height • Breach width • Breach angle • Breach coefficient • Breach speed • Breach input area • Breach level area • External surface level • External water level • External area
- Rain area
- Limit area
- Output