Avaliação das vazões alocáveis na bacia hidrográfica do Rio dos Bois e sub-bacia do Rio do Peixe, estado de Goiás
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Data
2006-06
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Resumo
This study evaluates the flows that can be allocated
to users in the Bois River Basin and its sub-basin,
Peixe River Basin, in Goiás, in order to provide information
for water resources management instruments established
by Federal Law 9.433/97, emphasizing charging
for the use of water resources.
The Bois River Basin covers 34,552.04 km2 , corresponding
to 10% of the total area of Goiás. A large amount of
river flow data is available, supplied by twenty stations,
with historical series and distribution that allowed the
regionalization of the flows at the exit from the basin. The
RH 3.0 software was developed by Minas Gerais Rural
Foundation - RURALMINAS and Federal University of
Viçosa, with the support of the Department of Water Resources
of the Ministry of the Environment. It was used to
estimate the guaranteed flow 95% of the time (Q95) to the
outflow from Bois River Basin, obtaining the value of
118.100 l/s.
The Goias State Council for Water Resources (CERHGO),
in resolution 09/2005, established Q95 as reference
flow for water use rights under the state domain. The
maximum flow that can be allocated corresponds to 70%
of Q95, or, for the Bois River Basin, 82.670 l/s.
To check the feasibility of using this reference flow and the
portion allocated, the study performed a survey of the
criteria used in eleven Brazilian states.
The Peixe River Basin has a drainage area of 287.49
km2. In this basin, the complete lack of hydrological data
and the impossibility of data transfer because of the small
drainage area prevent the calculation of Q95 and its use as reference flow. Such situations are common in most small
river basins in Goiás.
In such cases, according to CERH-GO resolution 09/2005,
the smallest flow ever measured, preferably during a drought
period using a precision method, is used as reference.
To obtain the reference flow in the Peixe River Basin, flow
measurements were performed using a current meter, at
four points in the basin, along the main course, on four
occasions, from June, 2003 to April, 2004.
The reference flow at the end of Peixe River Basin was obtained
from these measures, with the value of 627 l/s,
which corresponds to the smallest flow measured at that
place. The part of the flow that can be allocated from the
reference flow was obtained based on the criteria adopted by
the water management authority, with a value of 94 l/s.
Key-words: Flows allocated; river basin.
Descrição
Palavras-chave
Vazões alocáveis, Outorga, Bacia hidrográfica, Flows allocated, River basin
Citação
SANTOS, Harlen Inácio dos; OLIVEIRA, Leandro Gonçalves; FIOREZE, Ana Paula. Avaliação das vazões alocáveis na bacia hidrográfica do Rio dos Bois e sub-bacia do Rio do Peixe, estado de Goiás. Revista Brasileira de Recursos Hídricos, Porto Alegre, v. 11, n. 2, p. 47-58, abr./jun. 2006.