# Bowen ratio (Heat Overlay)

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Icon | Attribute | Unit | Range | Description |
---|---|---|---|---|

BOWEN_RATIO | ratio | Describes the rate of heat transfer for a surface that has moisture as a factor. |

The Bowen ratio is a property of a surface, specifically the ratio between two types of heat transfer (sensible heat and latent heat). The wetter the surface, the lower the ratio.^{[1]}

## Notes

- The DPRA Heat stress report uses only two possible values for the Bowen ratio: 0.4 and 3.0.
- By default, Functions such as trees and vegetation generally have a ratio of 0.4. Other functions have a ratio of 3.0.
- The value must be in the range of 0.001 to 10.

## See also

- Terrain bowen ratio (Heat Overlay)
- Bowen ratio result type (Heat Overlay)
- PET formulas (Heat Overlay)

## References

- ↑ Wikipedia. Bowen Ratio. https://en.wikipedia.org/wiki/Bowen_ratio. Last visited: 16-12-2019