Sewer area (Water Overlay) and Breach (Water Overlay): Difference between pages

From Tygron Support wiki
(Difference between pages)
Jump to navigation Jump to search
mNo edit summary
 
mNo edit summary
 
Line 1: Line 1:
A sewer area is part of the definition of a [[sewer model (Water Overlay)|system of sewers]] in the specified area. Sewer storage is present in the hydrological model wherever the sewer area intersects with a [[Sewered_(Water_Overlay)| sewered construction]].
A breach is a modification to the [[terrain height (Water Overlay)|terrain height]], with an optional in- or outflow of water for the hydrological model. This can be used to represent calamitous situations, such as a breach in a levee. Breaches can also be used to easily simulate a terrain height increase, like a levee.


Similar to water level areas, sewer areas only define a sewer storage amount in grid cells that are marked as sewered. A grid cell is marked as sewered, if:
A breach can either be defined solely as a terrain height modification using its [[Breach_height_(Water_Overlay)|BREACH_HEIGHT]] attribute, or as a connection to a water body outside of the hydrological model by adding attributes related to the external water body. If the breach is only defined as a terrain height change, only water that is already created or defined in some other way in the hydrological model can flow through and from it.
#It is covered by a construction with a [[Sewered_(Water_Overlay)|SEWERED]] attribute > 0.
#It is covered by a sewer area with a SEWER_STORAGE attribute > 0.


A sewer area can also pump stored sewer water to an [[External area (Water Overlay)|external area]] outside the project. However, water that has been pumped out will remain in the external area and cannot be pumped back. By default sewers do not pump water to external areas.
If the breach is given the attributes required for the external water body, water will automatically be created or removed uniformly on the breach, depending on the simulated water body "behind" the breach.  
{{Overlay attribute
 
|attribute=[[Sewer_storage_(Water_Overlay)|SEWER_STORAGE]]
The breach can grow over time, based on its initial width and the critical speed at which water may flow. If a [[Breach_width_(Water_Overlay)|BREACH_WIDTH]] is defined, the breach's polygon is intersected with a circle emanating from the centerpoint of the polygon. It is only in that intersection, dubbed the "active breach", that water will flow in from the simulated external water body. The radius of the circle defining the intersection will expand as water flows, based on the critical speed of the water as defined in the [[Breach_speed_(Water_Overlay)|BREACH_SPEED]] attribute. All cells in the active breach are considered directly adjacent to the external water body.
|unit=m
 
|description=The maximum water height the sewer can store. This value, multiplied by the grid cell size and the amount of grid cells marked as sewered, forms the total amount of water this sewer can store.
The [[terrain height (Water Overlay)|terrain]] covered by the entire breach area is considered lowered to the height defined by its [[Breach_height_(Water_Overlay)|BREACH_HEIGHT]] attribute, even if the active breach does not extend across the entirety of the breach area.
|defaultvalue=0
|icon=[[File:waterwizard_icon_sewer_storage.png]]
|attribute2=[[Sewer_pump_speed_(Water_Overlay)|SEWER_PUMP_SPEED]]
|unit2=m<sup>3</sup>/s
|description2=The amount of water per second, removed from the sewer by pumping it to an external area outside the project.
|defaultvalue2=0
|icon2=[[File:waterwizard_icon_sewer_pump_speed.png]]
}}
==Notes==
* With the [[Water_Overlay_Wizard|Configuration wizard]], [[How to generate a sewer|sewers can be generated]] based on [[neighborhoods]] in the project.
* Water pumped out of a sewer cannot be pumped back once it has left the hydrological model.


==How-to's==
Water flowing through or across a breach will flow in the direction defined by the [[Breach_angle_(Water_Overlay)|BREACH_ANGLE]] attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. If no [[Breach_angle_(Water_Overlay)|BREACH_ANGLE]] is defined, water can flow in any direction.
* [[How to generate a sewer|How to generate a sewer]]


==See also==
If no critical speed is defined, the active breach will never grow. If no width is defined, the width is assumed to be very large, creating an intersection exactly the size of the polygon.
* [[Sewer model (Water Overlay)|Sewer model]]
* [[Sewer overflow (Water Overlay)|Sewer overflow]]


{{Overlay attribute
|attribute=[[Breach height (Water Overlay)|BREACH_HEIGHT]]
|unit={{mdatum}}
|description=The new [[terrain height (Water Overlay)|terrain height]] at the location of the breach.
|defaultvalue=n/a
|icon=[[File:waterwizard_icon_breach_height.png]]
|attribute2=[[Breach width (Water Overlay)|BREACH_WIDTH]]
|unit2=m
|description2=The initial width of the breach.
|defaultvalue2=10000
|icon2=[[File:waterwizard_icon_breach_width.png]]
|attribute3=[[Breach angle (Water Overlay)|BREACH_ANGLE]]
|unit3={{geoangle}}
|description3=The angle at which water flows out through the breach.
|defaultvalue3=n/a
|icon3=[[File:waterwizard_icon_breach_angle.png]]
|attribute4=[[Breach speed (Water Overlay)|BREACH_SPEED]]
|unit4=m/s
|description4=The critical speed factor used in the [[Breach growth formula (Water Overlay)|breach width growth formula]].
|defaultvalue4=n/a
|icon4=[[File:waterwizard_icon_breach_speed.png]]
|attribute5=[[External surface level (Water Overlay)|EXTERNAL_SURFACE_LEVEL]]
|unit5={{mdatum}}
|description5=The height of the bottom of the external water body behind the breach. The lowest level the external water level can lower to.
|defaultvalue5=0
|icon5=[[File:waterwizard_icon_external_surface_level.png]]
|attribute6=[[External water level (Water Overlay)|EXTERNAL_WATER_LEVEL]]
|unit6={{mdatum}}
|description6=The water level of the external water body behind the breach. The initial level the water level is set to.
|defaultvalue6=0
|icon6=[[File:waterwizard_icon_external_water_level.png]]
|attribute7=[[External area (Water Overlay)|EXTERNAL_AREA]]
|unit7=m²
|description7=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.
|defaultvalue7=0
|icon7=[[File:waterwizard_icon_external_surface_level.png]]
|attribute8=[[Breach input area (Water Overlay)|BREACH_INPUT_AREA]]
|unit8=Area ID
|description8=The [[area]] representing the influx area for the breach. Water will flow directly from the influx area to the breach itself.
|defaultvalue8=none
|icon8=[[File:waterwizard_icon_breach_input_area.png]]
}}
{{WaterOverlay hydrological features nav}}
{{WaterOverlay hydrological features nav}}
{{Water Module buttons}}
{{Water Module buttons}}

Revision as of 13:58, 19 June 2019

A breach is a modification to the terrain height, with an optional in- or outflow of water for the hydrological model. This can be used to represent calamitous situations, such as a breach in a levee. Breaches can also be used to easily simulate a terrain height increase, like a levee.

A breach can either be defined solely as a terrain height modification using its BREACH_HEIGHT attribute, or as a connection to a water body outside of the hydrological model by adding attributes related to the external water body. If the breach is only defined as a terrain height change, only water that is already created or defined in some other way in the hydrological model can flow through and from it.

If the breach is given the attributes required for the external water body, water will automatically be created or removed uniformly on the breach, depending on the simulated water body "behind" the breach.

The breach can grow over time, based on its initial width and the critical speed at which water may flow. If a BREACH_WIDTH is defined, the breach's polygon is intersected with a circle emanating from the centerpoint of the polygon. It is only in that intersection, dubbed the "active breach", that water will flow in from the simulated external water body. The radius of the circle defining the intersection will expand as water flows, based on the critical speed of the water as defined in the BREACH_SPEED attribute. All cells in the active breach are considered directly adjacent to the external water body.

The terrain covered by the entire breach area is considered lowered to the height defined by its BREACH_HEIGHT attribute, even if the active breach does not extend across the entirety of the breach area.

Water flowing through or across a breach will flow in the direction defined by the BREACH_ANGLE attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. If no BREACH_ANGLE is defined, water can flow in any direction.

If no critical speed is defined, the active breach will never grow. If no width is defined, the width is assumed to be very large, creating an intersection exactly the size of the polygon.

Template:Overlay attribute

Water Module
Benchmarks button.png
Introduction button.png
Water Module
Benchmarks button.png
Getting started button.png
Tutorials
Benchmarks button.png
Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
Benchmarks button.png
Benchmarks
Group
Water area
Water level • Water relative
Sewer area
Sewer storage • Sewer pump speed
Inundation area
Inundation level
Aquifer
Aquifer kd • Aquifer datum
Breach
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
Rain m
Limitation area
Limit area
Output
Object flow output • Object height output • Object datum output a • Object datum output b • Object width output
Related
Building attributes • Hydraulic structures •  Terrain attributes • Model attributes • Results • Simulation data


Benchmarks button.png
Introduction button.png
Water Module
Benchmarks button.png
Getting started button.png
Tutorials
Benchmarks button.png
Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
Benchmarks button.png
Benchmarks
Retrieved from "https://support.tygron.com/w/index.php?title=Sewer_area_(Water_Overlay)&oldid=25683"