Water quality monitoring data and entropy-based ecological assessment of the Kremenchuk Reservoir, Ukraine, 2003–2022

This dataset contains surface-water quality monitoring observations for five stations located on the Dnipro River and the Kremenchuk Reservoir, Ukraine. The observations cover the period from 2003 to 2022 and include total nitrogen, biochemical oxygen demand over five days (BOD5), suspended solids, dissolved oxygen, sulfate, chloride, ammonium, nitrate, nitrite, phosphate, synthetic surfactants, permanganate oxidizability, chemical oxygen demand, phytoplankton, atrazine, and simazine. The package contains the unchanged author-supplied Excel workbooks, a combined machine-readable CSV table, station metadata, a data dictionary, provenance and processing documentation, and derived tables reproducing the averages, exceedance counts, and entropy-based water-quality index reported in the related article. The dataset contains 847 monitoring records from five monitoring stations, covering the period from 13 January 2003 to 11 October 2022. Numeric zeros in measurement fields of the supplied Excel workbook were defined by the dataset owner as missing values and were converted to empty fields in the processed CSV file. No values were imputed. The original Excel source files remain unchanged. Primary data source: State Agency of Water Resources of Ukraine, State surface-water monitoring data: https://data.gov.ua/dataset/surface-water-monitoring. Related publication: Bezsonnyi, V., Plyatsuk, L., Ponomarenko, R., and Tretyakov, O. (2023). Determination of the ecological state of the Kremenchuk Reservoir on the basis of information entropy. Technogenic and Ecological Safety, 13(1), 20–26. DOI: 10.52363/2522-1892.2023.1.3.