This methodology was applied to a study conducted in the Czech Republic within the entire Vltava River basin, with a total area of 27,578 km 2, and utilized in depth to assess a 543 km 2 catchment of the Vlašimská Blanice River. This enabled us to prioritize the most endangered areas at different scales, ranging from the third-order catchments to very small subcatchments, and to design the appropriate combination of control measures to mitigate surface and drainage water runoff, with these being the main drivers of associated pollution. The critical points, i.e., sites presenting the entry of quick surface and drainage runoff into waters, are classified into three (for surface pollution sources using a WaTEM/SEDEM model) or four (subsurface = drainage sources via the catchment-measures need index) categories, respectively. This paper describes a new approach for the mutual delineation and assessment of different pollution sources where the critical points method is used to identify the origin of contamination and the source areas. Slowing Abstract: Non-point sources of water pollution caused by agricultural crop production are a serious problem in Czechia, at present. A comprehensive method utilized for identifying priority areas on a large scale, including agricultural drainage, was presented in a study conducted by, which assessed runoff and nitrate leaching processes using the SWAT model and GIS tools in risky areas, and accordingly positioned and evaluated seven types of structural measures in the study.Ĭitation: Kvítek, T. Nevertheless, several complex approaches have been documented in the literature. In numerous cases, and especially in practice, runoff reduction interventions and water quality improvement measures are separately propounded or adopted solely for the selected individual measures. ![]() ![]() However, not many studies offer procedures that enable the simultaneous assessment of both surface and drainage water pollution sources, nor propose appropriate measures that do not neglect the first or second type of rainfall-runoff process (and even the presence and topology of land drainage) or the associated water quality dynamics.
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