# Surface evaporation formula (Water Overlay)

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Surface evaporation is calculated per cell.

*Δh = min( h , Δt * E*_{w}* E_{o})

where:

- Δh = The amount of evaporation which takes place.
- Δt = Computational timestep in seconds.
- h = The amount of water on the surface. Also known as the water column.
- E
_{w}= The evaporation rate of the weather. - E
_{o}= The SURFACE_WATER_EVAPORATION_FACTOR of the Water Overlay.

## Related

The following topics are related to this formula.

- Formulas
- Surface water level formula (Water Overlay)
- Models
- Surface model (Water Overlay)
- Evaporation model (Water Overlay)