CWP = Yield / AETI, with unit conversion to kg/m3. AETI in mm is equivalent to m3/(10 ha) or 1 mm = 10 m3/ha. CWP measures the physical mass of harvested economic crop yield produced per cubic meter of total evapotranspired water.
Usage
wapor_calc_cwp(
yield_value,
aeti_mm,
yield_unit = "kg/ha",
provenance = NULL,
compatibility_mode = c("warn", "strict")
)Arguments
- yield_value
Numeric. Yield (scalar or raster).
- aeti_mm
Numeric. Seasonal AETI in mm (scalar or raster).
- yield_unit
Character. Unit of yield: "kg/ha" (default) or "t/ha".
- provenance
Optional named provenance records for
yieldandaeti. When omitted, raster metadata is checked where available.- compatibility_mode
Missing-metadata policy:
"warn"or"strict". Known incompatibilities always stop the calculation.
References
Molden, D. (1997). Accounting for water use and productivity. SWIM Paper 1. International Irrigation Management Institute (IIMI), Colombo, Sri Lanka.
Bastiaanssen, W. G. M., & Steduto, P. (2012). The water productivity score (WPS) for irrigated crops: Concept and application. Agricultural Water Management, 108, 119-132.