EN
Spatial distribution of annual precipitation is important element of engineering hydrology. To prepare precipitation maps for larger areas, proper methods of spatial interpolation and long-term precipitation records are needed. For analysed Upper Vistula Basin, 403 such representative stations with records for years 1952-1981 have been chosen and verified. Regularized Spline with Tension method of interpolation have been selected (2D version) to intepolate spatial distribution of annual precipitation in Soła watershed, and cross-validation method for results verification.