Purpose: to analyze hydrochemical indicators of surface and underground natural waters quality, as well as collector-drainage waters from irrigation systems in Kaluga Region in order to establish a correlation between the content of pollutants in them.
Materials and methods. The research materials were taken from the information portal of the All-Russian Research Institute of Irrigation Systems and Agricultural Water Supply "Raduga" and provided by the Federal State Budgetary Institution "Land Reclamation and Agricultural Water Supply Department for the Kaluga Region", which discharges drainage waters into natural water bodies from drainage and irrigation systems under its operational management.
Results. The mass concentration of iron in the waters discharged into the Zhizdra and Oka rivers exceeds the water quality standards for water bodies of fishery importance by 4.3 and 2.1 times, respectively, but it is 1.3 and 1.05 times less than the background concentration of iron in these rivers. The mass concentration of sulfates in drainage and waste water is 4.3 and 2.6 times lower than the standard, while in natural water it is 1.3 and 1.6 times higher. Therefore, drainage and waste water do not worsen the quality of natural water in the Zhizdra and Oka rivers according to the listed indicators. The concentration of polyphosphates and BOD₅ in discharged waters exceeds not only the water quality standards for water bodies of fishery importance, but also the corresponding indicators of natural waters, which indicates the need for planning and implementing environmental measures and engineering and environmental protection measures for rivers that can reduce the concentration of polyphosphates and BOD₅.
Conclusions: in all observed water bodies of the Kaluga Region, the average concentration of iron, polyphosphates and BOD₅ exceeds the water quality standards for water bodies of fishery importance, therefore, when planning agricultural activities and implementing water protection measures, it is these indicators that need special attention.
drainage and waste water, irrigation systems, quality indicators of drainage and waste water, quality indicators of surface water, negative impact on the environment
Vlasov M. V. On issue of assessing the drainage water quality from irrigated lands in Kaluga region. Ways of Increasing the Efficiency of Irrigated Agriculture. 2025;95(1):197–210. (In Russ.).
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