Sewer overflow (Water Overlay): Difference between revisions

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Sewer overflows are points where water is moved from the sewer area to the above-ground water system. A sewer overflow will allow water to flow through if the water in the sewer exceeds the {{inlink|SEWER_OVERFLOW_THRESHOLD}}, and the water in the connected sewer exceeds the height of the terrain at the location of the sewer overflow. It will then function for all sewers part of that sewer area.
Sewer overflows are points where water is moved from the [[sewer model (Water Overlay)|sewer]] to the [[surface model (Water Overlay)|surface water system]]. A sewer overflow will allow water to flow through if the water in the sewer exceeds the [[Sewer_overflow_threshold_model_attribute_(Water_Overlay)|SEWER_OVERFLOW_THRESHOLD]], and the water in the connected sewer exceeds the height of the terrain at the location of the sewer overflow. It will then allow water to flow out of all sewers overflows part of that sewer area.


[[File:waterwizard_icon_sewer_overflow.png]] A sewer overflow is a {{inlink|lcase=1|Point-based constructions}}. It must intersect with a {{inlink|lcase=1|Sewer area}}, but does not need to intersect with an actual sewer.
[[File:waterwizard_icon_sewer_overflow.png]] A sewer overflow is a [[Point-based_building_(Water_Overlay)|point-based building]]. It must intersect with a [[Sewer area (Water Overlay)|sewer area]] but does not need to intersect with an actual [[sewered (Water Overlay)|sewered]] building.
{{Overlay attribute
 
|attribute=[[SEWER_OVERFLOW]]
{{Overlay keys|suppresscategory=true|
|unit={{mdatum}}
{{:sewer overflow attribute (Water Overlay)}}
|description=The height of the bottom of the sewer, relative to the average terrain height of the connected sewer. Starting from this height, the water height in the sewer must exceed the height of the terrain at the location of the overflow in order for water to flow out.
{{:sewer overflow speed (Water Overlay)}}
|defaultvalue=n/a
|icon=[[File:waterwizard_icon_sewer_overflow_height.png]]
|attribute2=[[SEWER_OVERFLOW_SPEED]]
|unit2=m3/s
|description2=The maximum speed at which water can flow out from the sewer through this overflow.
|defaultvalue2=10
|icon2=[[File:waterwizard_icon_sewer_overflow_speed.png]]
}}
}}
Note that at most one overflow can exist per sewer area.
 
{{article end
|notes=
* At most one overflow can be linked to a [[Sewer area (Water Overlay)|sewer area]] and vice versa.
* Water will flow from the sewer, through the sewer overflow, to open water when the water height in the sewer is larger then the sewer threshold, calculated as [[Sewer storage (Water Overlay)|Sewer Storage]] times the [[Sewer_overflow_threshold_model_attribute_(Water_Overlay)|SEWER_OVERFLOW_THRESHOLD]].
* Sewer overflows can be generated along with [[sewer area (Water Overlay)|sewer area]]s in the [[Water Overlay Wizard|configuration wizard]]. They will be generated in the first [[terrain water (Water Overlay)|water terrain]] which is covered by a [[sewer area (Water Overlay)|sewer area]] and a [[water area (Water Overlay)|water area]].
<ul>
<li style="display: inline-block;">[[File:Sewer_overflow.jpg|left|thumb|500px|Schematic overview of a sewer overflow.]]</li>
<li style="display: inline-block;">[[File:Sewer_overflowed.jpg|left|thumb|500px|Schematic overview of water overflowing from a sewer.]]</li>
</ul>
 
|howtos=
* [[How to correct multiple buildings on the same location]]
|seealso=
* [[Sewer Overflow formula (Water Overlay)]]
* [[Sewer area (Water Overlay)]]
* [[Sewer model (Water Overlay)#Sewer Overflow|Sewer model on Sewer Overflow]]
}}
 
{{WaterOverlay hydraulic structure nav}}

Latest revision as of 12:38, 11 May 2026

Sewer overflows are points where water is moved from the sewer to the surface water system. A sewer overflow will allow water to flow through if the water in the sewer exceeds the SEWER_OVERFLOW_THRESHOLD, and the water in the connected sewer exceeds the height of the terrain at the location of the sewer overflow. It will then allow water to flow out of all sewers overflows part of that sewer area.

A sewer overflow is a point-based building. It must intersect with a sewer area but does not need to intersect with an actual sewered building.

Icon Key Unit Range Description Default value
SEWER_OVERFLOW m + datum -10000 to 10000 The height at which the Sewer Overflow is situated. The average height at which the related Sewer Area will be situated is relative to this height. n/a
SEWER_OVERFLOW_SPEED m3/s 0 to 3.4028235E38 The maximum speed by which the water flows through the overflow. 10

Notes

  • Schematic overview of a sewer overflow.
  • Schematic overview of water overflowing from a sewer.

How-to's

See also

Water Module
Water Module
Tutorials
Overview
Theory
Benchmarks
Group
Inlet
Inlet q • Inlet area • Inlet capacity •  Lower threshold •  Upper threshold • Inlet underground
Pump
Pump q •  Lower threshold •  Upper threshold • Pump angle • Pump capacity • Pump area
Culvert
Culvert diameter • Culvert rectangular height • Culvert threshold • Culvert n
Weir
Weir height • Weir width • Weir angle • Weir coefficient • Weir n • Weir target level
Sewer overflow
Sewer overflow • Sewer overflow speed
Drainage
Drainage q • Drainage datum • Drainage active • Drainage overflow threshold
Output
Object flow output • Object height output • Object datum output a • Object datum output b • Object water area output • Object width output • Weir dam output
Related
Building attributes • Hydrological features •  Terrain attributes • Model attributes • Results • Simulation data
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