Use and land cover of the watershed of the Igarapé Nazareth, Ji-Paraná – Rondônia: Subsidies for the framework

Abstract

Improve management of water resources in Brazil is crucial to a good social, environmental and economic development. Thus, management instruments such as the watershed framework aim to collaborate with maintaining the quality of this resource. To improve the management of water resources in Brazil’s northern region, this work aimed to gather information on the diagnostic step for the framing of the Igarapé Nazaré, located in the State of Rondônia, generating subsidies for framing. To achieve the objectives applied methods of indirect landscape analysis from remote sensing image processing in a GIS, and also direct methods such as periodic visits in the watershed. From the results, it was possible to identify the historical process of the use and occupation of the watershed coming to 2019 with 84% of its anthropic territory, and its main use, the livestock occupying 69% of the area. It was identified as major sources of pollution the Refrigeration industries (5) and growth of fish farming in the last decade (205 systems identified) which may be throwing large loads of nutrients through the effluents. Taken together, there was a steady increase at the watershed of the urban environment (10.5%/2019) during all years analyzed, generating a greater load of effluent on watershed.