Model attributes (Water Overlay): Difference between revisions

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|{{anchor|SEWER_OVERFLOW_THRESHOLD|[[Sewer_overflow_threshold_(Water_Overlay)|SEWER_OVERFLOW_THRESHOLD]]}}
|{{anchor|SEWER_OVERFLOW_THRESHOLD|[[Sewer_overflow_threshold_(Water_Overlay)|SEWER_OVERFLOW_THRESHOLD]]}}
|fraction
|fraction (m/m)
|How much of a sewer's storage must be filled with water before the [[Sewer overflow (Water Overlay)|sewer's overflows]] are allowed to overflow water.
|How much of a sewer's storage must be filled with water before the [[Sewer overflow (Water Overlay)|sewer's overflows]] are allowed to overflow water.
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Revision as of 13:11, 20 June 2019

The water overlay's model calculations depend on a number of calculation-wide parameters. These parameters are available as attributes of the water overlay and can be modified as such.

Icon Attribute Unit Description
Waterwizard icon allowed water increase.png ALLOWED_WATER_INCREASE_M m The amount by which the water level on a water terrain must increase before it is considered stressed by water. This is used to compute the WATER_STRESS result type.
DESIGN_FLOOD_ELEVATION_M m Constructions in the 3D world are assumed to have at most this height compared to the surface of the terrain. Greater values can create a more accurate model but will impact performance.
GRAVITY m/s² Used constant for gravitational acceleration.
GROUND_BOTTOM_DISTANCE_M m Assumed distance under the terrain surface where the soil becomes impenetrable for water. The groundwater level cannot go below this depth, relative to the surface. The maximum amount of water that can be stored underground is equal to this attribute multiplied by the local terrain's WATER_STORAGE_PERCENTAGE.
GROUND_WATER boolean Whether water in the underground is simulated during the calculation. If this is deactivated, surface and underground infiltration, and underground evaporation do not occur. Water flowing in- and out of the sewer are still simulated when sewers are present.
Waterwizard icon allowed water increase.png IMPACT_FLOOD_THRESHOLD_M m The amount of water a construction must experience before it is considered impacted by water. Water must reach this height either on one of the cells the construction is on, or on one of the cells adjacent to it. This is used to compute the IMPACTED BUILDINGS result type.
LIMIT_RAIN boolean Whether rainfall locations should be limited to water level areas, or rainfall will fall in the entire project area.
MAX_WATER_DEPTH_M m The maximum depth of water on a cell that is able to move horizontally. This parameter can be set to influence the wave part in the Saint-Venant equations.
MIN_SLOPE rise over run The minimum slope required to account for the effect of gravity on the speed of the water. If the slope of the terrain is less than the minimum slope, the effect of gravity on the speed of the water is assumed to be 0.
QUAD_CELL boolean Whether to use quad-cell technology for more detailed calculations. This is an internal functionality.
SEWER_OVERFLOW_THRESHOLD fraction (m/m) How much of a sewer's storage must be filled with water before the sewer's overflows are allowed to overflow water.
Waterwizard icon allowed water increase.png SHOW_DURATION_FLOOD_LEVEL_M m The amount of water which must be present in a specific location before the duration of surface water can be recorded. This is used to compute the SURFACE_DURATION result type.
SURFACE_WATER_EVAPORATION_FACTOR factor The factor by which the weather's evaporation factor is multiplied to compute the amount of evaporation which takes place on the surface.
TIMEFRAMES integer The number of intermediate results recorded during the calculation. Each timeframe becomes a snapshot of data which can be viewed and analysed. The total simulation time is divided by this value, and at each interval of that period of time a snapshot of the results so far is made. Note that the first timeframe does not contain the starting conditions of the simulation, but the state of the simulation after the first period of time has passed.
WALL_ANGLE degrees The minimal angle for a slope to be considered a wall. Cells that have a wall behavior will slow down and reflect the water's movement considerably. The x- and y-direction are handled separately.