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The development of regional or local maximum permissible concentration (MPC) for a pollutant in the soil requires the field or laboratory simulation of pollution. The experimental design should include the control (uncontaminated soil with the background concentration of the pollutant) and at least three treatments with different pollutant concentrations in the range between 2 and 10 background values. Experiments are performed in at least three replicates. Soil samples are taken 30 days after contamination. In ea...

Mathematical modeling of river flow formation processes is the basic research and engineering tool for modern hydrology. Despite a number of undoubted successes in modeling and a fairly wide introduction of models into practice, a number of problems remain that point to the fundamental difficulties of traditional approaches to the problem. The most important among such tasks are: assessment of the regime of extreme hydrological events, primarily floods; Use of hydrological models on unexplored basins; Perspective ...