Bridge elevation (Water Overlay): Difference between revisions

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[[File:Wateroverlay_wizard_bridge_elevation.png|thumb|right|Bridge elevation can be configured in ''Structure Settings'' step of a [[Water Overlay]] wizard.]]
{{Overlay attributes|<onlyinclude>
{{Overlay attributes|<onlyinclude>
{{Overlay attributes|type=row|overlay=Water  
{{Overlay attributes|type=row|overlay=Water  
|attribute=INCLUDE_BRIDGE_ELEVATION
|attribute=BRIDGE_ELEVATION
|unit=boolean
|unit=nominal
|description=Whether to include bridges in the elevation model used for the water calculations.
|description=Specifies the mode by which bridges are include in the elevation model, used for the water calculations.
|defaultvalue=Lowest
|icon=waterwizard_icon_bridges.png
|range=0 to 2
}}</onlyinclude>}}
}}</onlyinclude>}}


This attribute defines whether to include bridges and other floating buildings in the [[Elevation_model_(Water_Overlay)|elevation model]] used for the water calculations.
The water model uses an elevation model for the surface flow calculations. This setting defines how to include bridges in this elevation model:
{{nominal list|zeroindex=true
||'''Lowest''': The lowest elevation point from the terrain elevation (DTM) below bridge is used, when the terrain is '''[[Water (Terrain Attribute)|water]]'''. Otherwise the behavior is similar to '''Terrain'''.
||'''Terrain''': Under bridges, the terrain elevation (DTM) is used, otherwise the [[#Notes|limited]] surface elevation (DSM) is used. Water can flow under the bridge according to the terrain elevation.
||'''Bridge''' : Use bridge deck as elevation. Bridges and [[Align elevation (Function Value)|floating]] buildings are included in the DEM, blocking water flow.
}}
 
====Example====
The following images show the effect of the different options on both land and water under a bridge. The elevation data is set up such that it is slightly raised under the bridge, as often happens; the bridge deck itself is included in the terrain elevation data, or its support pillars, both on land and water. As can be seen below, the '''Lowest''' option selects the lowest terrain value under the bridge for water, but not on land.
<gallery widths="300px>
File:bridge_surface_elevation_lowest_water.png|Lowest option measured on water
File:bridge_surface_elevation_terrain_water.png|Terrain option measured on water
File:bridge_surface_elevation_bridge_water.png|Bridge option measured on water
</gallery>
<gallery widths="300px>
File:bridge_surface_elevation_lowest_land.png|Lowest option measured on land
File:bridge_surface_elevation_terrain_land.png|Terrain option measured on land
File:bridge_surface_elevation_bridge_land.png|Bridge option measured on land
</gallery>
 


{{article end
{{article end
|notes=
|notes=
* This attribute is by default set to 0 which means bridges are not included so water can flow under the bridge.
* When using '''Bridge''' mode, it is still possible to model the flow from one side of a bridge to the other by using a [[Culvert (Water Overlay)|Culvert]].
* In the advanced settings step of the [[Water Overlay Wizard]], this attribute can also be (de)activated.  
* The surface elevation (DSM) always limits the height of the buildings to the [[Design flood elevation m (Water Overlay)|design flood elevation]].
* For more control, you can also set this attribute to 1 and use a [[Culvert_(Water_Overlay)|square culvert]] to regulate water flowing under a bridge.  


|howtos=
|howtos=
* [[How to add and remove an Attribute]]
* [[How to add and remove an Attribute]]
|videos=
}}
}}
=See also=
* [[File:Bridges.jpg|link=https://youtu.be/833-e53D4fo|thumb|left|200px|Explanation of how bridges are made water permeable in the {{software}} (Dutch only)]]{{clear}}
{{WaterOverlay model attribute nav}}
{{WaterOverlay model attribute nav}}

Latest revision as of 10:58, 28 February 2024

Bridge elevation can be configured in Structure Settings step of a Water Overlay wizard.
Icon Attribute Unit Range Description Default value
Waterwizard icon bridges.png BRIDGE_ELEVATION nominal 0 to 2 Specifies the mode by which bridges are include in the elevation model, used for the water calculations. Lowest

The water model uses an elevation model for the surface flow calculations. This setting defines how to include bridges in this elevation model:

0. Lowest: The lowest elevation point from the terrain elevation (DTM) below bridge is used, when the terrain is water. Otherwise the behavior is similar to Terrain.
1. Terrain: Under bridges, the terrain elevation (DTM) is used, otherwise the limited surface elevation (DSM) is used. Water can flow under the bridge according to the terrain elevation.
2. Bridge : Use bridge deck as elevation. Bridges and floating buildings are included in the DEM, blocking water flow.

Example

The following images show the effect of the different options on both land and water under a bridge. The elevation data is set up such that it is slightly raised under the bridge, as often happens; the bridge deck itself is included in the terrain elevation data, or its support pillars, both on land and water. As can be seen below, the Lowest option selects the lowest terrain value under the bridge for water, but not on land.

  • Lowest option measured on water

  • Terrain option measured on water

  • Bridge option measured on water

  • Lowest option measured on land

  • Terrain option measured on land

  • Bridge option measured on land


Notes

  • When using Bridge mode, it is still possible to model the flow from one side of a bridge to the other by using a Culvert.
  • The surface elevation (DSM) always limits the height of the buildings to the design flood elevation.

How-to's

Water Module
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Water Module
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Overview
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Benchmarks
Group
Model attributes
Allowed water increase m • Avg shore width m • Avg terrain width m • Avg terrain storage m • Breach measurement distance m • Bridge elevation • Culvert dem threshold m • Design flood elevation m • Extended reconstruction • Ground bottom distance m • Ground bottom pressure m • Ground water • Ground water depth m • Ground watertable with surface • Impact flood threshold m • Impact range m • Increased resolution • Infiltration factor s
Limit area • Limit rain • Max infiltration m • Max water bottom m • Microrelief storage fraction • Min max elevation • Object entry correction • Prequel surface level relative • Rise rate distance m • Sewer overflow threshold • Shoreline • Show duration flood level m • Stabilizer angle • Start date ms • Surface water • Surface water evaporation factor • Timeframe times • Timeframes • Unsaturated fraction • Weir dam multiplier • Weir move interval s • Weir move range m • Weir move step m
Related
Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Results • Simulation data
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