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The Influence of the Urban Systems over the Quantitative Balance and the Quality of the Water in Mureş Valley between Reghin and the Confluence with Aries River. The dynamics of urbanization in Mureş valley between Reghin and the confluence with Aries River, expressed through the general positive trend registered in the numeric evolution of population and through the continue evolution of the urban surfaces(associated with rhythms supported by functional development), is constituted as a modifying factor of the initial balance of water, quantitative and qualitative. The high concentration of population from urban zones (of these, Tg. Mureş has, by far, the largest polarizing valences) have repercussions over the matter and energy and imply: scenery changes, modifications in the water, sediment, chemical reactive and microorganisms flux, as well as an increase in heat emission. Also, all of these changes have consequences over urban ecosystems, and especially over the waters that transit or stagnate on urban surfaces.

KEYWORDS: urban systems, quantitative balance, quality of water, Mureş Valley, Reghin - with Arieş River