Occurrence and role of water in nature. Hydrosphere, hydrogeological cycle, hydrogeological cycle in catchments. Researching methods, hydrometry. Rivers net. Catchments as a system and objective of research. Water balance of groundwater catchments (percipitation, evaporation, runoff, retention) as base of water management. Relations between groundwater and surface water. Groundwater natural reserves and demands for water. Seasonal variability of hydrogeological processes in temperate climate. Basis of water management. Hydrogeological service of the country.
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