Investigation and Assessment of the Demarcation Method for Federal Riverine and Accreted Lands: Case Study of the Rio de Janeiro State Section of the South Paraíba River

Government planning and, in particular, continuous monitoring are important to support land use and environmental planning. When there is no such supervisory intervention, in areas belonging to the federal government or in areas that should be protected, population occupation and expansion will occur, thus impairing the social and environmental balance. This study analyses the Brazilian Federal Heritage Department’s riverine and accreted land demarcation system and proposes to add the flow rate corresponding to the two-year recurrence period, as suggested by the State Environmental Institute of the State of Rio de Janeiro. The case study of the Paraiba do Sul River portion of Rio de Janeiro was investigated, and the findings indicate that the system of the Federal Heritage Department does not take into account the current anthropization of the river, primarily due to the development and operation of hydroelectric power plants. Furthermore, it was found that the limnimetric scales of the studied gauging stations are affected by frequent changes in the riverbed and occupation of the riverbank, making it difficult to estimate the extent of ordinary floods. The study concludes by recommending the adoption of a flow rate with a two-year recurrence period and the simulation of runoff conditions for average ordinary flood line demarcation. It is assumed that at each gauging station or place of interest, the demarcation of the MOFL along a river should not be individually assessed because the river has its own complex flow. In order to evaluate the water levels corresponding to floods with a RI of 2 years, future studies should therefore model the hydrodynamic runoff conditions of the Rio de Janeiro portion of the Paraíba do Sul River and then validate these levels on site through topo-bathymetric surveys.

Author (s) Details

Jussara Stutz Oliveira
Programa de Planejamento Energético da COPPE, Rio de Janeiro Federal University, Rio de Janeiro, Brazil.

Monica de Aquino Galeano Massera da Hora
Environmental Water Resources Laboratory, Department of Agricultural and Environmental Engineering, Fluminense Federal University, Niteroi, Rio de Janeiro, Brazil.

Marcos Aurélio V. de Freitas
Programa de Planejamento Energético da COPPE, Rio de Janeiro Federal University, Rio de Janeiro, Brazil.

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