Sewer overflow (Water Overlay)

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

• At most one overflow can be linked to a 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 times the SEWER_OVERFLOW_THRESHOLD.
• Sewer overflows can be generated along with sewer areas in the configuration wizard. They will be generated in the first water terrain which is covered by a sewer area and a water area.

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  Schematic overview of a sewer overflow.

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  Schematic overview of water overflowing from a sewer.

How-to's

• How to correct multiple buildings on the same location

See also

• Sewer Overflow formula (Water Overlay)
• Sewer area (Water Overlay)
• Sewer model on Sewer Overflow

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Water Module

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Hydraulic structures

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