Efeitos ambientais de barragem subterrânea na microbacia do Córrego Fundo, Região dos Lagos/RJ

• Ano de defesa: 2006
• Autor(a) principal: Freitas, Iara Mello de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Programa de Pós-graduação em Ciência Ambiental; Multidisciplinar
• Palavras-chave em Português: Impacto ambiental; Águas subterrâneas; Barragem subterrânea; Environmental impact; Groundwater; Underground dams; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS
• Link de acesso: https://app.uff.br/riuff/handle/1/17259

Aiming at developing alternatives for small-scale agricultural irrigation to preserve crops during periods of drought in the dry regions of Rio de Janeiro, the method of underground dams was introduced in that State. The purpose of this study was to evaluate the applicability and the major impacts of this technology, integrating physical analysis of the environment and specific software. Meteorological data was analyzed, including historical series and important information was obtained during the study, such as: soil texture; the low permeability layer depth; water level on the soil profile; electrical conductivity of irrigation water and soil saturation extract; and hydraulic conductivity of the saturated layer. Chemical analysis of water stored during 2005 was performed on a monthly basis, in order to evaluate water quality for family or community needs and for small-scale irrigation. Data was added to a Geographic Information System and input to groundwater simulation software. The results indicate that the dam works as a mixed-flow reservoir, with average discharge of 32m3/day, decreasing to 5m3/day when runoff stops. According to chemical analysis, water quality was considered good and evaluation by Land Quality Indicators indicates positive impact of the technology. It must be pointed out that historical irregular rainfall and data collected during a rainy year will restrict general utilization of this study s results.