WaterCROPv2 is designed to estimate irrigation
water demand at a national scale by effectively balancing hydrological accuracy with manageable data
requirements.

WaterCROPv2 is an agro-hydrological bucket model that simulates the crop and irrigation water demand
during the growing season depending on soil, climate, crop, and irrigation system features. The bucket
is designed as a single soil layer whose depth corresponds to the length of the plant roots Zn. As Zn
elongates during the plant growth, the control volume of the storage changes its depth accordingly. The
bucket not only stores water but also receives and releases hourly volumes of water. The fluxes entering
the storage are the effective precipitation (P_eff ) and the crop blue water demand (ETb),
while the exiting ones are the leakage (L) and the actual evapotranspiration (ETa) also known as crop
water demand. P_eff is the precipitation P decreased firstly of the volumes of drizzle water intercepted by
the canopy, T , and secondly of the runoff R.