VNII Galurgy Stock Co., St. Petersburg, Russia:
A. O. Vorobiova, Senior Researcher
A. S. Makashova, Researcher, al.makashova@gmail.com

Russian State Hydrometeorological University, St. Petersburg, Russia:
T. I. Prokofieva, Associate Professor, Candidate of Geographic Sciences

In small rivers of Kama river basin which are in the zone of potential influence from industrial facilities of potash production for nearly 20 years already are being made regular hydrological observations. They involve measuring of water flow rates and hydro-chemical testing. The weak point in the existing observation system over water and hydro-chemical modes (regimes) of surface watercourses is the insufficient (four times a year) periodicity of the observations. At the same time the available database of accumulated hydrological information and long-term experience in its use and analysis enabled us to solve a number of specific problems related to assessment of environmental condition of rivers and brooks, finding of sources for anthropogenic feeding, establishing of trends in changing of hydro-chemical mode of watercourses, calculations of saline balance for particular areas of rivers to evaluate volumes of anthropogenic brines incoming into them. This paper gives short presentation of results for some applied research conducted in recent years in the basins of several rivers, as well as justifies the techniques and methods for processing of hydrological information that enabled to significantly increase the informative value of data about the flow rates of river water and its chemical composition received during the standard (four regular) observations. In particular, here are shown the results received on the relationships between mineralization and water flow rates, as well as migration curves of macrocomponent composition for river water(s). Submitted materials may be useful and interesting, first of all, insofar as it refers to the methodology of using limited initial data about water and hydro-chemical modes (regimes) of small rivers for evaluation of their environmental condition (state) and solving some applied problems.

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