Nossos serviços estão apresentando instabilidade no momento. Algumas informações podem não estar disponíveis.

River Basins and Hydrographic Divisions of Brazil | 2021

Description

The product River Basins and Hydrographic Divisions of Brazil results from the Technical Cooperation Agreement between the National Water Agency – ANA and the IBGE.

The National Hydrographic Division - DHN was already established in 12 Hydrographic Regions, by Resolution No. 32, of 10.15.2003, of the CNRH (National Council of Water Resources), widely adopted in the country. Now with the partnership between ANA and the IBGE, two more hierarchical levels were implemented, with spatial limits, names and codes, comprising: Hydrographic Macroregions, Hydrographic Mesoregions and Hydrographic Microregions. As a result, such hydrographic sections become part of the Geographical Reference Framework for the Production, Analysis and Dissemination of Statistics, released by the IBGE since 2019.

The BHB250, in turn, makes available to the public the main river basins in Brazil, in the strict sense of the term: Area of the earth's surface delimited by water dividers that captures and drains, through slopes, rivers and streams, rainwater towards a single exit, located at a lower point of the relief. Thus, unlike the DHN250, which considers aspects of territory occupation and resource management, this database is focused on the geomorphological aspect concerning the delimitation of its units. Thus, studies of hydrological and environmental aspects that require the use of this natural division have a reference base in the scale 1: 250,000.

The dataset was produced from ANA's Ottocoded Hydrographic Base (BHO), which uses Otto Pfafstetter's methodology, proposed in 1989.