In this paper water-balance studies of a soil column at an observation site at Ulvsunda, Stockholm, are reported. The change of the water storage in the soil was obtained from soil moisture measurements, which were carried out by the neutron scattering method. The precipitation was also measured. The percolation from the soil column was estimated from the change in ground water storage beneath the column. It has not been possible to measure the evapotranspiration directly but it has been calculated from the water-balance equation for every month during 1964-66.