# ET.Romanenko

##### Romanenko Formulation

Implementing the Romanenko formulation for estimating potential evapotranspiration.

##### Usage

```
# S3 method for Romanenko
ET(data, constants = NULL, ts="daily", …)
```

##### Arguments

- data
A list of data which contains the following items (climate variables) required by Romanenko formulation:

*Tmax*,*Tmin*,*RHmax*,*RHmin*- constants
Dummy argument with a

`NULL`

value.- ts
Must be either

`daily`

,`monthly`

or`annual`

, which indicates the disired time step that the output ET estimates should be on. Default is`daily`

.- …
Dummy for generic function, no need to define.

##### Details

This formulation provides a single calculation method with no alternatives available.

##### Value

The function prints a calculation summary to the screen containing the following elements:
- ET model name and ET quantity estimated
- Time step of the output ET estimates (i.e. the value of argument `ts`

)
- Units of the output ET estimates
- Time duration of the ET estimation
- Number of ET estimates obtained in the entire time-series
- Basic statistics of the estimated ET time-series including *mean*, *max* and *min* values.

The function also generates a list containing the following components, which is saved into a `csv`

file named as *ET_Romanenko.csv* in the working directory:

Daily aggregated estimations of Romanenko potential evapotranspiration.

Monthly aggregated estimations of Romanenko potential evapotranspiration.

Annually aggregated estimations of Romanenko potential evapotranspiration.

Monthly averaged estimations of daily Romanenko potential evapotranspiration.

Annually averaged estimations of daily Romanenko potential evapotranspiration.

Name of the formulation used which equals to `Romanenko`

.

Type of the estimation obtained which is `Potential Evapotranspiration`

.

##### References

Oudin, L., Hervieu, F., Michel, C., Perrin, C., Andreassian, V., Anctil, F.Loumagne, C. 2005, *Which potential evapotranspiration input for a lumped rainfall-runoff model?: Part 2-Towards a simple and efficient potential evapotranspiration model for rainfall-runoff modelling*. Journal of Hydrology, vol. 303, no. 1-4, pp. 290-306.

##### See Also

##### Examples

```
# NOT RUN {
# Use processed existing data set and constants from kent Town, Adelaide
data("processeddata")
data("constants")
# Call ET.Romanenko under the generic function ET
results <- ET.Romanenko(data, ts="daily")
# }
```

*Documentation reproduced from package Evapotranspiration, version 1.10, License: GPL (>= 2)*