Using the example of typical for sub-boreal and south taiga zones in Western Siberia small rivers of the Gham’ and Chaya basins - the Poros, Basandayka, and Klyutch Rivers, the monthly water balance was calculated and the statistical analysis of long-term changes in seasonal and annual values of the cumulative moistening in catchment area and in flow and its losses was made.  It was found that since 1970 the change was statistically significant in the temperature of surface air and, consequently, the boundaries of hydrological seasons in the northern basin of the Tom’ River were shifted, and this was manifested in an increase of winter flow in the Basandayka river in the last two-three decades. On the contrary, in case of strongly waterlogged land in the Chaya River basin, statistically significant decrease of flow was observed in spring and winter seasons due to certain lowering in moistening. An anthropogenic impact on small river flow was minor in general. 

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