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Purpose: to conduct hydrochemical studies of water and bottom sediments, as well as to assess their hazard level in the diversion channel of the rice irrigation system. The relevance of the research is due to the entry of a large number of pollutants into water bodies, especially from rice irrigation systems. Materials and methods. The assessment of the pollution level of bottom sediments with heavy metals was carried out by indices: pollution factor and degree, geoaccumulation index; aquatic environment – by the anthropogenic load index, mixture toxicity index. The materials for assessing the pollution level of water and bottom sediments were the results of field observations of the collector, through which drainage waters from the rice irrigation system are diverted to the Don River. Results. The content of such heavy metals as iron, manganese, copper, lead and zinc was studied in the collector-drainage runoff and bottom sediments. The content of exchangeable manganese and total forms of copper and zinc in the bottom sediments of the collector exceeds the background concentrations in the bottom sediments of the Don River by 1.2–4.9 times. The ecological state of the bottom sediments of the collector is characterized as moderately polluted. The content of manganese in the collector-drainage water exceeds the maximum permissible concentrations by 154–223 times, iron by 4–5 times, copper by 5 times. The assessment of the quality of bottom sediments in terms of soil pollution with heavy metals showed a weak nature of their pollution. Conclusions. The high content of manganese, copper and iron characterizes the bottom sediments as a source of secondary pollution of collector-drainage waters in the collector, however, compared with the maximum permissible concentrations of heavy metals for soils, their content is not exceeded. The establishment of environmental safety and the development of methods for the bottom sediments disposal require further research.

Purpose: to develop the main stages of planning the measures of engineering and environmental protection of water bodies – drainage water inlets from irrigated lands. Materials and methods. When developing the stages of planning the measures of engineering and environmental protection of water bodies, recommendations for assessing the environmental and economic efficiency of investment projects for agricultural land reclamation and methods for calculating environmental payments necessary to take into account the effectiveness of environmental protective measures were used. Results. Planning the measures of engineering and environmental protection of a water body can be conditionally divided into four stages. At the first stage, the comprehensive monitoring studies of the water system and agrolandscape in the river catchment basin are carried out. The second stage consists of conducting their comprehensive environmental assessment, including the calculation of such indicators as the combinatorial index of water pollution, the indicator of anthropogenic water body load, the total indicator of soil pollution, bottom deposits, the soil loss rate, the soil formation rate, soil salinization, sodium, magnesium alkalinization, as well as the calculation of cost environmental indicators. At the third stage, a set of measures for engineering and environmental protection of a water body is developed, and at the fourth, a quantitative assessment of the effectiveness of the proposed measures is carried out. Conclusion. Environmental indicators that quantitatively characterize the anthropogenic load on water bodies as a result of the irrigation system operation are proposed. A methodical approach is proposed and the main stages of planning the engineering and environmental protection of water bodies – drainage water inlets from irrigated lands are defined, consisting in a comprehensive assessment of all components of the agro-landscape with the subsequent development of engineering, agrotechnical, agroforestry and agrochemical measures that contribute to the formation of a favorable environmental situation in the river basin.