QUASI THREE-DIMENSIONAL GROUNDWATER FLOW WITH THE RAINWATER RECHARGE MODEL AND WATER BALANCE

Land development often leads to adverse environmental effects. It is therefore important to assess the potential change in regional hydrologic cycle due to surface alteration in advance. A rainwater recharge model, that is to be combined with the quasi-threed imensionaul nconfinedg roundwater flow, is proposed in the presentp aper.The water balance in the catchment of the planned campus of Kyushu University is evaluated by the present schemew hiche nables to simultaneously calculate both the surface runoff and groundwater flow. The resultso btained in the present paper indicate that the calculated monthly and annual runoff agree well with the observed discharge.Besides, it is also shownt hat the variation of the groundwatetra ble can be accuratelyc alculated.On the other hand, however, it is revealedt hat the calculatede vapotranspiratiorne mainsu ncertainb ecause of the lack in the information of accurate potentiale vapotranspiration. Some attempts are presented in order to improve the calculation of the evapotranspiration.