This work deals with solutions to the problems of water flow in the soil profile. It takes into account processes occurring at the soil surface as well as water uptake by plants. Soil surface processes are delt with using a modification of a model proposed by Feddes et al. [4]. Practical application of the proposed model is illustrated by an example of a layered soil with variable pipe-drain spacing. Calculations were performed for the growing season of grasses, assuming two different root systems.