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The paper presents the analysis of the area and reach of the Silnica river catchment and its six subcatchments delineated using GIS in three different variants: DEM (from Computerized Information System of Country Protection project;  Polish: ISOK) in one-meter resolution, the Database of Topographic Objects (Polish: BDOT) in 1 : 10 000 scale and the Geodetic Utilities Network System (Polish: GESUT). A topographic map in 1 : 10 00 scale was also compared with the Map of Hydrographic Division of Poland (Polish: MPHP) and the differences in the catchment reach resulting from this comparison were also examined. The course of delineated drainage divides varied in each variant resulting in differences in the area and reach of the analyzed catchments. The best results in urban catchments delineation were obtained in GIS using DEM and corrected vector data from BDOT and GESUT databases. In this case, the catchments’ reach overlapped with the existing drainage network. Traditional methods with the use of topographic maps and data from MPHP 1 : 10 000 scale proved to be less accurate as far as the reach of the Silnica river catchment was concerned and were useless in delineating the Silnica sub-catchments in Kielce city center.

Wykorzystanie metod GIS do wyznaczania działów wodnych zlewni zurbanizowanych na przykładzie miasta Kielce