Irrigation Efficiency — irrigation

Computes multiple irrigation efficiency metrics: conveyance, application, overall, and consumptive use efficiency.

irrigation_efficiency(
  water_delivered,
  water_diverted,
  water_stored = NULL,
  crop_et = NULL,
  verbose = TRUE
)

Arguments

water_delivered: Numeric vector. Water delivered to field (mm or m3).
water_diverted: Numeric vector. Water diverted from source (mm or m3).
water_stored: Numeric vector. Water stored in root zone (mm or m3). If NULL, application and overall efficiency are not computed.
crop_et: Numeric vector. Crop evapotranspiration (mm). If NULL, consumptive use efficiency is not computed.
verbose: Logical. If TRUE, prints informational messages. Default TRUE.

Value

A data frame with efficiency metrics expressed as percentages. Columns depend on inputs provided:

conveyance_eff: Conveyance efficiency (percent), always computed
application_eff: Application efficiency (percent), if water_stored is provided
overall_eff: Overall efficiency (percent), if water_stored is provided
consumptive_eff: Consumptive use efficiency (percent), if crop_et is provided

Details

Formula: $$IE = \frac{Water_{crop}}{Water_{applied}} \times 100$$

References

Grafton, R.Q. et al. (2018). The paradox of irrigation efficiency. Science, 361(6404), 748-750. doi:10.1126/science.aat9314

Examples

irrigation_efficiency(water_delivered = 400, water_diverted = 500,
                      water_stored = 350, crop_et = 320)
#> Irrigation efficiency computed.
#>   conveyance_eff application_eff overall_eff consumptive_eff
#> 1             80            87.5          70              80