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Water Balance in the Southern Part of Someşan Plateau. The study proposes to clarify the available scientific information about the water balance components and in this way to emphasize the geographic individuality of this hilly area in the North of the intracarpathian region, known as the Transylvanian Basin. At the same time, we evaluated the water resources of the Southern part of Someşan Plateau for different possible uses. To achieve the objectives, we analyzed and computed runoff values from seven hydrometrical stations, and the annual precipitation values from two meteorological stations and seven pluviometrical stations. The analyzed period was 1976 - 2005. Based on the correlations between altitude and the main components of the water balance (X-precipitations and Y- total runoff), we established validity zones for the relations X= f(Hm) and Y= f(Hm) and created maps with the precipitations and the total runoff distribution. Using GIS techniques for the precipitation and total runoff assessment, it became possible to obtain values over the altitudinal steps in the validity areas and also in the main geographic divisions. The underground runoff values where obtained by separating runoff with the help of the hydrographs of characteristic years. After determining these fundamental components, the other ones (evapotranspiration and the soil humidity) were computed with the help of the M.I.Lvovici formula for the water balance. Finally we computed a global water balance, for the entire analyzed region, and sectorial water balances, for its geographic divisions.

Keywords: Someşan Plateau, water balance, precipitations, runoff, evapotranspiration.