When discussing on the water budget in a basin scale with various land surface conditions, evapotranspiration is a key factor for the practitioners. It is known in forest hydrology that canopy interception, which is equal to the direct evaporation, accounts for around 20% of rainfall, while the transpiration through vegetation is affected by soil water content. However, rational method to interpret actual evapotranspiration is not sufficiently known to those who use the rainwater rechargeevapotranspiration discharge term in the quasi-three dimensional groundwater flow model. It is found that the proposed rainwater recharge-evapotranspiration discharge term functions properly, and the calculated water budget seems reasonable compared to the observation. On the other hand, however, it is also found that more examination is necessary for the initial loss of rainwater R0 and the parameter Hg* in the rainwater recharge model, which affect both groundwater recharge and actual evapotranspiration estimation.