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Avaliação das Vazões Alocáveis na Bacia Hidrográfica do Rio dos Bois e sub-bacia do Rio do Peixe, Estado de Goiás

2006; Brazilian Association of Water Resources; Volume: 11; Issue: 2 Linguagem: Inglês

10.21168/rbrh.v11n2.p47-58

2318-0331

ANA FIOREZE, Leandro Gonçalves Oliveira, HARLEN SANTOS,

Fish biology, ecology, and behavior

This study evaluates the flows that can be allo- cated to users in the Bois River Basin and its sub-basin, Peixe River Basin, in Goias, in order to provide informa- tion for water resources management instruments estab- lished by Federal Law 9.433/97, emphasizing charging for the use of water resources. The Bois River Basin covers 34,552.04 km 2 , correspond- ing to 10% of the total area of Goias. 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 Vicosa, with the support of the Department of Water Re- sources of the Ministry of the Environment. It was used to estimate the guaranteed flow 95% of the time (Q 95 ) to the outflow from Bois River Basin, obtaining the value of 118.100 l/s. The Goias State Council for Water Resources (CERH- GO), in resolution 09/2005, established Q 95 as reference flow for water use rights under the state domain. The maximum flow that can be allocated corresponds to 70% of Q 95 , 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 km 2 . 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 Q 95 and its use as Avaliacao das Vazoes Alocaveis na Bacia Hidrografica do Rio dos Bois e sub-bacia do Rio do Peixe, Estado de Goias 58 reference flow. Such situations are common in most small river basins in Goias. In such cases, according to CERH-GO resolution 09/2005, the smallest flow ever measured, preferably during a drought period using a precision