Analyze of the environmental impact study (EIS) and the water quality - the case in Brejo Santo borough,CearÃ,Brazil / AnÃlise do estudo de impacto ambiental e da qualidade da Ãgua - o caso AÃude Atalho - Brejo Santo,CearÃ

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

This work has as objective to analyze the Environmental Impact Study (EIS), carried through by SIRAC Consultant, and the water quality of Atalho reservoir situated in Brejo Santo borough, CearÃ, Brazil; to evaluate the EIS under the point of view of the released norms in Resolution 01/86 of CONAMA. The period of study was understood from January 2001 to January 2002 enclosing thus, different climatic periods and precipitations, in the hydraulic area basin of the dam. The study still proposed, to be acquainted with the environmental feasibility of the Atalho public dam project through the analysis of the main environmental impacts resulting from its implementation and operation. The undertaken environmental impact assessment was led according to the pondering assessment method developed by BIANCHI et alli, which resulted from the matrix method evolution, offered by LEOPOLD. The global undertaking analysis represented by gathering obtained results for functional and physical influenced areas, proved that in its original version, the project offers a sum of pondered benefits under to the contained adversities and indefinition groups, what characterizes it as indefinite or badly planned. The incorporation of environmental protection measures, however, would are able to revert this fact leading the project characterization to the area as favorable for the natural environment. For the analyzes of the water quality had been selected three distinct points inside the reservoir specified as P1, P2 and P3, being the two first situated next to the center of the dam and the P3 point next to the edges and the stream of the Pigs, main tributary of the dam. After the monitoring accomplished of the physical-chemical and biological variable of the waters in the dam, it can be classified as class 3 at the points P1 and P2, as suitable for the human use after conventional treatment and for the P3 point there is no suitability of found data to the Resolution 020/CONAMA , mainly for being strongly impacted due to the drainage sewage of Jati town, CearÃ. As to bathing the water of the dam was considered unsuitable for this use at the 3 monitored points mostly at point P3 . This was also due to the many antropic activities held at the reservoir banks. For evaluation of the Index of trophic classification were used CarlsonÂs IET modified for Kratzer and Brezonik and the proposed classification by OECD ( Organization for Economic Cooperation and Development ) . After the chemical analyses in the three monitored points P1, P2 and P3 it was evidenced that the waters of the dam presented a trophic state of mesotrophic type at P1 and P2 points and eutrophic at point P3. In short the reservoir Atalho after the ending of its construction in 1.988 and until the present date, it has not promoted the implementation of socioeconomics benefits to the region yet where it takes place. The water resources from the reservoir, as well as, the generation of energy in the reservoir is in function, mainly the waters transposition of San Francisco river contained in the original version of the project. Up to now, this dependence limits income generation through its multiple uses.

ASSUNTO(S)

cearà - impacto ambiental environmental impact water quality proteÃÃo ambiental qualidade da Ãgua outros impacto ambiental cearà - environmental impact

ACESSO AO ARTIGO

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