# Surface water level formula (Water Overlay)

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Surface water level is calculated per cell.

Where:

- = The surface water level, relative to datum.
- = The amount of water (the water column) on the surface.
- = The surface height in the cell, relative to datum.

## Related

The following topics are related to this formula.

- Constructions and features
- Inlet
- Sewer overflow
- Water area
- Inundation area
- Breach
- Formulas
- Surface flow formula
- Surface evaporation formula
- Surface infiltration formula
- Models
- Surface model
- Rain model
- Evaporation model
- Infiltration model
- Sewer model