AUTOMATIC WATERSHED DELINEATION IN CZECH REPUBLIC USING ARCGIS PRO

Abstract

Manual watershed delineation by watershed divides is traditionally performed by analysis of topographic maps and contour lines. With the availability of digital elevation models, watershed and stream delineation is performed automatically, which reduces the time spent on manual delineation. In this study, we introduce the process of automatic delineation and available models within the toolbox Arc Hydro Tool Pro, created by ESRI for ArcGIS Pro software. Automatic delineation was implemented by different methods on selected watersheds in Czech Republic, varying in area and altitude. Digital elevation models with different resolutions, from pixel size of 2 × 2 m to 50 × 50 m, were used as the input layer. Next, these delineated watersheds were compared with the current layer of fourth-order watershed divides, valid to 2019. Results of automatic delineation in each watershed, except those in lowlands, show a high overall accuracy. Automatic delineation can be applied not only as the input to hydrological models but also to consequent watershed analysis, for example, with the use of other tools in ArcGIS Pro.