Adapting classical water quality diagrams for ecohydrological and policy applications

• Classical diagrams show limited ecohydrological and policy information. Our retain major ions add four nutrient forms: NO 3 , NH 4 PO K. Advanced redox insight from sensitive parameters: Fe, SO 4. Holistic visual interpretation of chemical water quality norm exceedance. Ecological values have gained increasing attention over the past decades in both (eco)hydrological research resources management. Water is an important ecological steering variable, graphical may aid rapid hydrochemical status a site. Traditionally used for showing multiple variables (e.g. Stiff, Maucha) were developed primarily hydrogeological purposes, with information on ecologically relevant parameters. This paper presents adapted classical that traditional characterization, additionally provide nutrients characterization. A scaling factor minor to visually get them across more equally compared macro-ion diagram. Scaling presented based average concentrations, as well norms. Four different are presented, all same included, but appearances suit preferences individual users. Regional, national continental scale data illustrate how spatial temporal characteristics. The innovative respect adding comprehensive ecohydrologically species levels (NO K), advanced combination parameters (Fe, ) option relative measured concentrations or Using norms has advantage providing ‘alarm function’ exceedance when surpass ring We discuss possible standardisation factors enable comparability between sites.