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The paper features results of modeling of operating conditions of big-diameter pipelines used for water supply of Crimea. The Russian Federation is a constant member of the group of states having a large share in water resources. 10-15% of total water resources are distributed through the most developed regions in the European part of the country with 80% of population and production capacities. Federal districts differ widely in the range of local and incoming water resources, and North Caucasian and Southern Federal districts have the lowest water supply. The most water deficient region is the Crimea, where the most rivers are overregulated and serve for the purposes of water supply and watering. The Crimea counts 22 huge barrier basins with a total volume of 334.200 mln m3, a natural discharge volume of 188.920 mln m3, or 20% of the whole surface runoff of the Crimea. The barrier basins are filled during the autumnwinter season, during spring floods and sometimes – in the summer – due to excessive rainfalls. Today the off-channel basins of the North Crimean canal with volume 146.350 mln m3 are filled on a year-round basis from the Biyuk-Karasu river and underground sources. A solid-body model of pipeline basic elements is developed as a result of the experiment. Stress-strain state of the pipeline is analyzed in various combinations of loads. As the result of numerical experiments, the authors could define zones of occurrence of defects and damages on the basic elements. The zones can bear similar types of characteristic damages, which provides for harmonization of the ground penetration test profile laying procedure and definition of points for the necessary measurement of concrete strength at on-site inspections and tests. Calculation of stress-strain state supposed creation of an adequate calculation model under various operating conditions. The number of elements and nodes of the ensemble is, respectively, 73419 and 53429. Coding of initial information occurs in terms of the incremental method with due regard for presentation of pipeline fragments as objects with a simple geometric shape plates. Keywords—hydrotechnical structures, waterworks, big-diameter pipelines, stress-strain state, numerical computing methods, solid model, water conservation, reliability parameters, operating conditions.

Environmental Management in Republic of Crimea Represented by Modeling Use of Big-Diameter Pipelines in Various Operation Modes