Breach (Water Overlay)

A Breach area can be used to simulate a breach in a levee or dam.

Attributes

Key	Unit	Range	Description	Default value
BREACH_HEIGHT	m + datum	-10000 to 10000	The new terrain height at the location of the breach.	0
BREACH_WIDTH	m	0 to 10000	The initial width of the breach.	2
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	0 to 3.4028235E38	The flow coefficient related to the shape of the breach.	1.37
BREACH_SPEED	m/s	0 to 3.4028235E38	The critical speed factor in the breach width growth formula (e.g. 0.2 for sand and 0.5 for clay). A value of 0 or smaller corresponds to zero growth.	0
BREACH_INPUT_AREA	ID of an Area	-1 to 2147483647	The Area item representing the influx area for the breach.	none
EXTERNAL_SURFACE_LEVEL	m + datum	-10000 to 10000	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	-10000 to 10000	The water level of the external water body behind the breach. The initial value assigned to the water level.	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

Icon	Attribute	Unit	Range	Description	Default value
	BREACH_MEASUREMENT_DISTANCE_M	m	0 to 10000	Distance from the breach area to the automatic downstream water level measurement point, in the direction of the breach.	100