Author(s): Jakob Benisch; Bjorn Helm; Peter Krebs
Linked Author(s):
Keywords: No Keywords
Abstract: The European Union Water Framework Directive (European Commission, 2000) aims to achieve a good ecological and chemical status of all bodies of surface water by 2027 and has developed an integrated guidance on surface water chemical monitoring (e. g. WFD Guidance Document No. 7/19, Hanke et al. 2009; WFD-CIS 2003) which is transferred into national German law (Ordinance for the Protection of Surface Waters, OGewV, Bundesministeriumder Justiz und fur Verbraucherschutz, 2016). For the majority of compounds, this act requires a monthly sampling frequency to assess the chemical water quality status of a surface water body. To evaluate the representativeness of the sampling strategy under the OGewV, high-frequency online monitoring data is investigated under different sampling scenarios and compared with current, monthly grab sampling strategy. About 23 million data points were analyzed for this study, three chemical parameters (dissolved oxygen, nitrate-nitrogen, chloride concentration) and discharge data were selected from four catchment of different sizes ranging from 51 391 km2 to 84 km2 (Elbe, Vereinigte Mulde, Neisse and two stations at Lockwitzbach, see Figure 1).
Year: 2024