Analysis of grant criteria based on minimum flow and flow according to duration curve for water consumptive uses. / Análise dos critérios de outorga de direito de usos consuntivos dos recursos hídricos baseados em vazões mínimas e em vazões de permanência.

AUTOR(ES)

Ludmilson Abritta Mendes

DATA DE PUBLICAÇÃO

2007

RESUMO

Through these ten years of the Water Resources Brazilian Policy, some difficulties have been presented to the water resources management in so far as the management instruments has becoming solid, mainly to the grant of right for using water resources. A problem of those refers to the low water availability in several water basins, where the total water demands exceed the maximum volume permitted in agreement with the law. This situation occurs by the state criteria which impose low limits for the surface outflows, expressed by minimum flow or flow according to duration curve. This work analyses the constraints when the hydrologic water availability is referred to the Q7,10 (minimum flow with duration of 7 days duration and 10 years of return period), to Q95% (flow equalized or overstated in 95% of the time) or to Q90%. These flows were calculated from the daily records in two hydrological stations located at Turvo River, State of São Paulo, where the consumptive uses are higher than the water availability. The Q7,10 flow was obtained through four probabilistic methods. Also the duration curves were obtained and the results was used to determine the maximum value granted according to state criteria referred to Q7,10, Q95% and Q90% flows. Then, its argued the imprecision related to these three flows in several aspects and the inconvenience of fixing an scanty and universal ceiling to different demands profiles. In conclusion, its suggested the substitution of these criteria and, through some cases of management of critical basins, its pointed alternative methods of grant of right for using water resources.

ASSUNTO(S)

recursos hídricos (gerenciamento; instrumentos) water resources (management ; instruments)

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