325 resultados para Gestao ambiental : Recursos hidricos : Bacias hidrograficas


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Pós-graduação em Agronomia (Energia na Agricultura) - FCA

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Pós-graduação em Agronomia (Energia na Agricultura) - FCA

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Pós-graduação em Geociências e Meio Ambiente - IGCE

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV

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Pós-graduação em Engenharia Civil e Ambiental - FEB

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The present study was concerned with checking the water quality, the recovery of the riparian vegetation and vegetation around the springhead of stream Bandeirantes, such as the inadequate disposal of waste along this stream, which is located in Rio Claro, SP, in the period from March to July of 2010. Aiming to propose mitigation measures to reverse the degradation processes and develop activities to help a better awareness of the population directly related to this water resource. The water quality was analyzed by performing monthly sampling in three different points along the stream. The first point of sampling is in the spring of the stream, the second at the region called estradão and the third near its mouth, when it flows into the Ribeirão Claro, a tributary of the right bank of the Corumbataí river. It was calculated from the Water Quality Index (WQI) developed by Cetesb. The results were compared with current law. The riparian vegetation, which is responsible for the protection of rivers and streams, was observed and examined during the field work. The results indicated the stream as class 2 and the WQI has been classified, in the most of the analysis, such as a water of good quality. However, some parameters showed a worrying situation and highlighted the current situation, with waste deposits, furniture and animal waste into the pit of the stream studied

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With the accelerated urbanization process of Brazil from the 50s, there was a disorderly occupation of spaces and consequent soil sealing. Unlike this growth, the support capacity of urban environments has not evolved in the same way, generating negative environmental impacts to the citizens. Among these impacts are the effects of flooding. In order to minimize the negative effects of extreme precipitation over cities, the government invests in corrective measures, like compensatory techniques on urban drainage, which have as a basic principle the retention and infiltration of the rainfall, dampening the peak flow and runoff. An example of applying these techniques in urban areas are the detention basins, commonly called large pools. The hydraulic design of these structures is dependent of complex data and variables, and projects involving small areas generally use simplified methods for defining the reservoirs volume of the storage (Tassi, 2005). One of these methods is presented in this study, which relates to the percentage of soil sealing to the specific storage volume (m³/ha) in combination by applying the hydrological model of the Rational Method and analyzing regional rainfall and soil occupation over the basin. Within this context, the basin of the Wenzel stream, which is located amidst the urban area of Rio Claro/SP, also presents the problems related to human occupation in its valley. Thus, by the method presented has been adjusted a curve correlating the percentage of impermeable area and the specific volume of a detention basin. For the current situation of Wenzel Basin with 82% of impermeable area, and return period of 10 years, the specific volume is 262.1 m³/ha. The presented method is consistent with the results of other studies in the area, and the expression obtained allows estimating the volume of storage required to match hydrograph pre and post-occupancy. It presents itself as a useful tool in the planning stage of...

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Environmental diagnosis fits in analysis social-spatial organization insofar it contributes to understanding past and present aspects of how a territory works as well as enables the creation of statements for future ordainment. In this context, the present study aims at contributing with data for creating recovery and environmental preservation projects for the basin of Macacos‟ stream‟s headwaters, located in the north of Álvares Machado county in São Paulo state. To achieve this purpose, the main characteristics and existing uses in the basin have been analyzed and its main environmental problems were identified in the data and information collected in journals, field work and interviews with dwellers from the interested area and local government authorities. On this way, a diagnosis of the environmental state of the studied area was performed considering its specific issues regarding the natural and physical process as well as human influences. From the analysis carried out it was possible to identify environmental impacts on different levels resulting from the conflictuous relation between uses and occupations and the natural dynamics of the studied basin.

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This work presents procedures for getting data to estimate grant flow by means of statistical and hydrological methods, acquired during the graduate course, of some streams in the watersheds of Aguapeí and Peixe rivers, in order to make available this data set to Sao Paulo State water and electrical energy department – DAEE and to the Committees of Aguapeí and Peixe watersheds. This study was performed using discharge data and the were a selection process to identify some faults in the historical series. Finally it was calculated the 7-day moving averages, Q7 and some characteristics discharges like Q90 and Q95. Taking into account the average discharge en seven days in a 10-year recurrence interval, it was estimated the grant flow of some streams. Data were generated for six posts inside the Aguapei and Peixe watersheds

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This study aimed to contribute to the environmental planning of the watershed Embirí stream - UGRHI Pontal Paranapanema (belonging to the Paranapanema Management unit) in the cities of Presidente Prudente and Regente Feijó, São Paulo. This basin is located in the area of the Santo Anastácio river source, responsible for supplying water to about 30% of the population of Presidente Prudente. The methodological procedures based on Leal (1995) and Rodriguez et al. (2004), and the steps include inventory and diagnosis of the basin. We conducted extensive literature review, cartographic and documentary on the subject area of research, field work, preparation of thematic maps and summary chart of physical units and environmental use and land cover, participatory mapping of environmental risks, quality analysis of water. Most of the basin of the stream of twine had a high environmental fragility and the main problems found were lack of riparian vegetation, erosion, siltation of water bodies, irregular disposal of debris and the dumping of sewage. The results were summarized in the diagnosis and can identify the most important environmental impacts, environmental and spatial weaknesses of the legislation, and thus draw up proposals for action to the area that is substantially degraded

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)