This model uses a soil water depletion technique to estimate applied irrigation rates. Irrigation is scheduled when the soil water depletion equals readily available water. The rates estimated in this model account for management-allowed depletion, which represents the irrigation manager's decision on what portion of the available water can be removed from the soil before growth or yield are affected. This model assumes that evapotranspiration rates and daily rainfall records are available. Also included is an example model that demonstrates how this irrigation scheduling might be used in a real-world water balance model.