The present analysis concerns the subject of surface runoff from slanting forest roads. In the Beskid Śląski area (Silesian Beskidy Mountains), where a drainage basin was completely afforested, sections of roads were selected to measure the water running off. In each section an open top culvert was installed. The analysis contains the already mentioned measurement methodology, characteristic features of both the drainage basin and the selected road sections, results the surface runoff measurement carried out on the selected road sections and finally the results of a simulated calculation of voluminal quotient of two values: surface runoff from the drainage area roads and precipitation over the drainage basin area (q_{dr P}) and a quotient of surface runoff from the roads in the drainage area and the runoff from the drainage basin (q_{dr Q}). The following values were estimated for the 2.1 mm rainfall rate: q_{dr P} = 0.42%, q_{dr Q} = 8.92%, whereas for the 9.8 mm rainfall the values were as follows: q_{dr P} = 0.93% and q_{dr Q} = 100.13%.

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