At the present stage of water management complex development as a part of the agricultural-industrial complex (AIC), there is an ambitious task to create fundamentally new technologies for using water resources for existing and emerging irrigation and watering systems (I.W.S.). Based on the transformations in natural environments natural processes unity (atmosphere, hydrosphere, upper layers of the lithosphere and soil cover) aimed at the water resources formation (surface and underground runoff) within the basin geosystem under consideration spatial limits, with water use technological processes at I.W.S. as a part of the natural-technical system (NTS) “Environment - I.W.S. – Population” (“E.- I.W.S. - P.”), presents the comprehensive studies results of the processes of interconnection, interaction and relationship (IIR) of the I.W.S. technogenic component with E. and living P., on the basis of which the methodological foundations were developed for putting forward the new ideas on water resources use, where the central concept is the “Ecological Acceptability” of design decisions, stipulating the system principle of the principal role of the whole in relation to the main problems of Energy, Water, Food and Ecology. The I.W.S. environmental acceptability is determined by the current regulatory environmental requirements for environmental safety (ES) in the areas of I.W.S. influence. Based on the comprehensive research results, the constructive and technological requirements are formulated for providing electronic components in design solutions, as factors in providing electronic information for I.W.S.

Purpose: to analyze the work of the information and analytical system for monitoring environmental parameters “Emersit-M35”, namely, daily data on flows and water levels from measuring complexes no. 239 and 241, located on the Temernik river, as well as to define the dependence of the flow rate on the water level and to calculate the runoff coefficients based on the data analysis obtained from the measuring complexes of Emersit-M35 environmental monitoring system on the Temernik river for the entire period of its work. Materials and Methods: the daily data on the flow rates and water levels from the measuring complexes no. 239 and 241, located on the Temernik river were analyzed, including graphs for comparing flow rates and water levels, the calculated values of the runoff module for 2018–2020 were presented, and the dependencies Q = f(H) for the entire operation period of the studied measuring complexes were determined. Results: it was found that there was a synchronization of the graphs of the flow rates and water levels on the measuring complex no. 241, and the stability level of the connection Q = f(H) here was more than 80 %, while there was no connection Q = f(H) on the measuring complex no. 239. It is noted that the reason for the absence of this connection is the location of the mentioned measuring complex which is subjected to the influence of the Don river. Conclusions: despite the revealed fact, the studies performed indicate the possibility of using the data obtained from the measuring complexes for the study and analysis of flow rates and water levels.

Purpose: to obtain equations for further use in calculating the maximum discharge of 1% availability along the whole river length, depending on watershed elevation (for the Black Sea basin rivers), based on the dependency curves. Materials and methods. The calculated and reference data of hydrometeorological services (series of observations for maximum water discharges) were the base materials. From the reference materials, the following hydrological characteristics were obtained: watershed area, average watershed elevation and 1% flow probability. The studies were carried out for 59 control stations on 14 rivers. Results. Dependence curves and equations for calculating the maximum flow rate of 1% flow probability for 14 rivers of the Black Sea basin, ranked according to watershed elevation into four groups: 0–500, 500–1000, 1000–1500, 1500–2500 m according to the Baltic System (BS) are obtained. A comparison of flow rates obtained from the calculated curves and available reference data was made, according to its results the average error about 25 % was determined. In the proposed method, there is a tendency to overestimate the values compared to the reference data. Conclusions. The calculated equations for flow rates of 1% probability in the elevation range of 0–500 and 500–1000 m BS, obtained as a result of the study, are very reliable and can be used to calculate the given value. To improve the accuracy of the equations in the elevation range of 1000–1500 and 1500–2500 m BS, along with the available data, it is recommended to use additional control stations in the corresponding elevation range.

Purpose: involvement of lands in irrigation using local runoff sources by simplifying and automating hydrological computations of spring floods according to the methodology in the absence of observational data with the possibility of minimal use of reference literature. Materials and methods. The program was developed in MS Excel and is designed to calculate the water body flow rates and build estimated flood hydrographs in the absence of hydrological observation data. Normative and methodological sources were used as initial reference materials. Results. The structure of the program, which consists of four interconnected blocks, in which sequential calculations are performed is given. Block 1 contains reference materials from the methodological literature that are necessary for the calculation. In block 2, the initial data is entered and the maximum instantaneous costs are calculated. Block 3 is intermediate, as it does not contain output data, but serves as a mathematical basis for further graphical construction of hydrographs. For their construction, data on analogue rivers are used. Block 4 displays the main calculated data: maximum discharges, runoff volumes and hydrographs for given reproducibility. Calculation algorithms for blocks 2 and 3 and output data for block 4 are presented. Conclusions. The possibility of involving agricultural lands in irrigation at the expense of local runoff reserves can be achieved thanks to the algorithm proposed by the authors and the program for calculating the maximum spring flood water discharges for various provision. This approach can significantly reduce the calculation of specified parameters by automating the process of selecting reference data and improve their accuracy by eliminating errors. All formulas used in this work comply with regulatory and methodological documents.

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