ABSTRACTThe solution with the aid of the hybrid computer of the partial and total differential equations for an integrated surface water groundwater system is described.A versatile computing technique has been developed to make a rapid and accurate study of the groundwater response due to varying inputs (deep percolation) or outputs (evapotranspiration) from the groundwater system. Spatial variations in basic vegetation phenomena, such as pattern, and hydrological parameters, are represented by means of a grid network which also allows the input of variable boundary conditions. The model is applied to an area in Columbia, South America which is subject to high water‐table conditions. Various reclamation schemes and management practices under conditions of irrigated agriculture are assesse