design_eto: Design reference evapotranspiration (Design ETo)

In BrazilMet: Download and Processing of Automatic Weather Stations (AWS) Data of INMET-Brazil

Design reference evapotranspiration (Design ETo)

Description

Function to calculate the reference evapotranspitation for irrigation design.

Usage

design_eto(eto_daily_data, percentile = 0.8, grouping = NULL)

Arguments

eto_daily_data	A data frame containing daily reference evapotranspiration values (mm day-1) named as "ETo", and other column with dates named "date". To estimate the design reference evapotranspiration, it is recommended to use more than 10 years of historical data.
percentile	The relative position of a value within the data distribution. The recomendation to desing irrigating is greater than 80 percent (0.8). For instance: The 90th (0.90) percentile of reference evapotranspiration (ETo) represents a value that is surpassed in only 10 percent of the observed period.
grouping	specifies the column used to group the data, typically by station. Use this parameter to calculate the design ETo separately for each station, based on the corresponding station code.

Value

Returns a numeric object with the desing ETo for the respective data and percentile.

Author(s)

Roberto Filgueiras

Examples

## Not run: 
design_eto_value <- design_eto(eto, percentile)

## End(Not run)

BrazilMet documentation built on June 8, 2025, 11 a.m.