Abstract. Area flooding is the main parameter necessary to achieve hydro technical defense schemes. This can be determined based on calculations performed in various programs. Of the many measures to limit the risk of flooding were chosen for comparison hydrotechnical for protection against floods schemes: embankment and building a polder area. Finally it is noted that structural measures are widely promoted because of the benefits arising from economically and ecologically necessary but complementary structural measures are the only high efficiency in cases with high abundant torrential floods. Today hydro technical schemes are a techno-economic and environmental compromise with fluctuating boundaries, making the decision to be very heavy, plus taking into consideration the temporal variability and the aspect of economy and nature. The optimal solution is specific to each river basin and establishing its methods are different, many of which are listed in this paper.
Meeting the ever-increasing needs of water for domestic, industrial, energy, and agriculture, is getting more and more difficult, due to the fact that water, both groundwater and surface waters are becoming more polluted, this being mostly due to industrial development, population growth, etc. European Council Directive 91/271/2002 transposed by Government Decision 188/2002 is the legal basis of community legislation on wastewater.The biological treatment process uses the metabolic activity of a group of organisms able to degrade organic matter to carbon dioxide and water (Robescu, 2008). In order to protect the environment, primarily the emissary, as well as the soil and air, a proper process of treatment should provide favorable conditions for further possible use of such water for domestic, industrial or agricultural activities (Banu, 2007).
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