Sewer area (Water Overlay)

A sewer area is part of the definition of a system of sewers in the specified area. A sewer is assumed to be present in all locations where a sewer area intersects with a sewered building.

In other words, a sewer is present if:

It is covered by a building with a SEWERED attribute > 0.
And it is covered by a sewer area with a SEWER_STORAGE attribute > 0.

The storage capacity of a sewer area can be calculated as the total surface size of sewered grid cells within that area times the value of the sewer storage attribute.

A sewer area can also pump stored sewer water to an external area outside the project. Water pumped to an external area cannot be pumped back. By default sewers do not pump water to external areas. Additionally, water can leave sewer areas into waterways through Sewer Overflows.

Icon	Key	Unit	Range	Description	Default value
	SEWER_STORAGE	m		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.	n/a
	SEWER_PUMP_SPEED	m³/s		The amount of water removed from the sewer per second, by pumping it to an external area outside the project.	0

Notes

With the Water Overlay Wizard, sewers can be generated based on neighborhoods in the project.
At most one sewer overflow can be linked to a sewer area and vice versa
Overlapping Sewer areas are not allowed. Should in any location two or more Sewer areas overlap, the values of one of them is used, and the values of the others are ignored.