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Start Over Author "David Da Silva" Journal revista brasileira de recursos hidricos
12 results on '"David Da Silva"'

6. Modelo para a Quantificação da Disponibilidade Hídrica: Parte 2 - Análise do Comportamento do Modelo para a Estimativa da Q7,10 na Bacia do Paracatu

Author

Douglas Oliveira de Queiroz, Luciano F. de Novaes, Demetrius David da Silva, Renata del Guidice Rodriguez, Marcia Mota Ramos, and Fernando Falco Pruski

Subjects
Hydrology, Return period, geography, geography.geographical_feature_category, Groundwater flow, Drainage basin, Aquatic Science, Structural basin, Oceanography, Water resources, Streamflow, Environmental science, Precipitation, Main channel, Earth-Surface Processes, Water Science and Technology
Abstract

In various places in the Paracatu river basin, in the months with the highest demand, water withdrawals have been higher than the maxi mum allowed by concession of grants, which indicates the need for a suitable quantifi- cation of water resources availa bility in the basin. Hence, the present work was developed and its objective was to analyze the behavior of a model (described in Part 1) to estimate minimum streamflow in a seven-day period and a return period of 10 years (Q7,10) in 21 stream gages lo- cated in the Paracatu basin. With the groundwater flow into the main channel at the beginning of the recession period (Q0), and with the recession coefficients ( α ), various combinations among these were obtained to verify which combination generated the most representative curve of the data observed. The best results obtained by the model for the estimation of Q7,10 were obtained when the mean α value of the analyzed stream gage was used and the Q7,10 was estimated by the equation adjusted to data from average precipitation on the drainage area of the given stream gage. Keywords: water resources management, river basin com- mittee, concession of grant

Published
2009
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7. Modelo para a Quantificação da Disponibilidade Hídrica: Parte 1 ? Obtenção da Equação de Recessão

Author

Márcio Mota Ramos, Renata del Giudice Rodriguez, Fernando Falco Pruski, Luciano F. de Novaes, Douglas Oliveira de Queiroz, and Demetrius David da Silva

Subjects
Hydrology, geography, Baseflow, geography.geographical_feature_category, Groundwater flow, Land use, Hydrological modelling, Aquatic Science, Structural basin, Oceanography, Streamflow, Tributary, Environmental science, Precipitation, Earth-Surface Processes, Water Science and Technology
Abstract

Hydrologic modeling is a t ool used to better under- stand and represent the hydrologic behavior of a hydro- graphic basin as the use of hydrologic model shows great potential to characterize the water availability under cli- mate or land use condition changes. The objective of the present work was to develop a model to estimate the mini- mum streamflow of the Paracatu river and its tributaries based on precipitation data. For this study data from 21 stream and 30 rain gages were analyzed. The development of the model to estimate the minimum streamflow from precipitation data was base d on the baseflow recession curve, identifying the parameters that define the 21 stream gages, and these were the recession coefficient of the baseflow ( α ) and the groundwater flow into the main channel at the beginning of the recession (Q0). The results obtained al- lowed to conclude that: the total precipitation in the months that preceded the Q0 occurrence allowed a good estimation of the behavior of this groundwater flow; and the greatest deviations obtained for the values of α occurred in the stream gages located in headwater regions where the topo- graphic, climatic and land use conditions tend to show greater discrepancies in relation to the average conditions of the basin

Published
2009
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11. Viability of creating a water agency in the Grande river basin, Bahia

Author

Kalesson Martins de Alencar, Michel Castro Moreira, and Demetrius David da Silva

Subjects
Water resources management, Water price, Water charging mechanisms, Technology, Hydraulic engineering, TC1-978, River, lake, and water-supply engineering (General), TC401-506, Geography. Anthropology. Recreation, Environmental sciences, GE1-350
Abstract

ABSTRACT The work was developed from the analysis of the viability of creating a water agency in the Grande river basin, located in western Bahia, Brazil. The charging mechanisms of five different water agencies in Brazil were applied to the basin. The simulations showed the possibility of an average annual collection in the basin of over R$ 2.2 million, which would provide a median value above R$ 160,000 per year for administrative costs of the agency. Thus, considering that the median value of the annual administrative cost to state agencies is close to R$ 300,000, the collection provided by the mechanisms studied would not initially allow the creation of a water agency for the Grande river basin. However, the adoption of one of the existing water agencies would be a more appropriate alternative for the implementation during a shorter period of time, given the technical and operational structure within which the current agencies function.

Published
2018
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12. Alternative mechanisms of charging for use of water resources in wastewater assimilation

Author

Amanda Rodrigues Moreira de Oliveira, Alisson Carraro Borges, Antonio Teixeira de Matos, Demétrius David da Silva, and Fernando Falco Pruski

Subjects
Charging mechanism, Compromised/Committed volume, Population equivalent, Technology, Hydraulic engineering, TC1-978, River, lake, and water-supply engineering (General), TC401-506, Geography. Anthropology. Recreation, Environmental sciences, GE1-350
Abstract

ABSTRACT Nowadays in most hydrological basins in Brazil, the charging mechanism of water use for effluents assimilation in inland surface water bodies is based on the emitted organic load parameter quantified in terms of Biochemical Oxygen Demand (BOD). This method is insufficient given the broad variety and compositions of discharges. Therefore, the objectives of the study are to propose alternative charging mechanisms for the qualitative use of water resources, aiming to insert, beside BOD, other parameters as calculation criteria; and to evaluate the charging potential for the Doce River hydrological basin. Two methods were proposed: the Limiting Population Equivalent (LPE) and the Compromised/Committed Volume (CV). Five water quality parameters were established: Biochemical Oxygen Demand, Chemical Oxygen Demand, Total Suspended Solids, Ammonia Nitrogen, and Phosphorus. The proposed mechanisms contemplated, from a broader perspective, the real problem concerning water quality in the Doce River basin. Simulations showed that phosphorus was a problem of concern for managing water resources in the specific basin. The method of Limiting Population Equivalent was considered of easiest application and understanding by its users.

Published
2017
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