The estimation of chemical composition of the gas andoil region of West Siberia waters is done. The development ofoil and gas deposits leads to the increasing of boggy drain tothe arctic rivers. Bogs enrich river waters with a considerablequantity of organic and nitrogen compounds and oil products.The chemical boggy drain to the arctic rivers in the naturaland broken conditions is estimated.

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The paper represents algorithm of spatial analysis,destined to locate the most appropriate plots for pipelineconstraining Moreover there is the particular result ofalgorithm application for medium scaled data in the article.The test territory is oil and gas field. There are alsoconclusions concerning the possible application of thealgorithm for environmental tasks.

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The aim of the research is assessment of possible riverflow changes. The probabilistic characteristics of river flowhave obtained on the base of statistic methods. The changes ofyear inflows to water reservoir and water distributions withinyear have evaluated. There is necessary to consider thechanges in management by water reservoir

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