Hydrological dataset for the Azul catchment (Argentina)

This dataset contains the data used for the characterization of the hydrological system components and the analysis of end-members in the Azul Stream watershed, Buenos Aires, Argentina. The hydrological components considered include rainwater, unsaturated zone water, groundwater, and surface water. The dataset is provided as three complementary files: 1. HydrologicalData_Azul.xlsx – A spreadsheet containing hydrological data (stream flow and water level), physico-chemical analyses and stable isotope (δ¹⁸O ‰ and δ²H ‰) data. 2. README_HydrologicalDataset_Azul.docx – A detailed document describing the sampling procedures, analytical methods, and metadata for each variable. 3. SamplingSites_Azul.kmz – A georeferenced file showing the location of sampling sites across the Azul Stream watershed. 4. EMMA-MIX_ModelRuns/ – Input and output files of the EMMA-MIX end-member mixing model (Carrera et al. 2004) used to perform hydrograph separation, organized in three folders corresponding to independent model configurations: 01-4EMs (four end-members: rainwater, unsaturated-zone water, shallow groundwater, deep groundwater), 02-4EMs_constrain (four end-members, with rainwater contribution to baseflow constrained to zero for samples with no antecedent rainfall), and 03-3EMs (three end-members: rainwater, shallow groundwater, deep groundwater). Each folder contains one input file (.prn) and three output files (.res, eigen.prn, EMMA.out). A README file (EMMA-MIX_README.pdf) describing the input data structure and the location of the optimal mixing proportions within the output files is provided alongside the model folders. These data support the identification of water sources and the estimation of their mixing proportions within the Azul Stream catchment.