MAPEAMENTO DAS ÁREAS DE PRESERVAÇÃO PERMANENTE NO PERÍMETRO URBANO DO MUNICÍPIO DE CANOINHAS -- ESTADO DE SANTA CATARINA.

The preservation of the environment is essential for safeguarding water resources, geological stability and the biodiversity of municipal territory, in accordance with the federal environmental legislation. By harnessing the Geographic Information System (SIG), the purpose of this work was to delineate and to review the Permanent Preservation Areas on the basis of legal parameters (Federal Law nº. 12,651/12) in the urban area of the municipality of Canoinhas. The digital cartographic base of the municipality of Canoinhas, the Secretary of State for Sustainable Development (SDS) and EPAGRI/IBGE was used specifically for this purpose, making it possible to manipulate geographical data on altimetry and water resources. On account of hydrographic discrepancies in the digital databases, a hydrological model had to be generated in order to rebuild the drainage system of the urban area. In lieu of other structures and in accordance with existing environmental legislation, feasible PPAs include areas associated with watercourses, springs and slopes. The present study identifies a total surface area of 7.3 km² - 22.5% of the urban area of the municipality of Canoinhas - of environmental constraints. The main operations were carried out in watercourses, chiefly by correcting and laying down channels. Nevertheless, in areas marked by wide floodplains on the main watercourses, the riparian forest was successfully preserved during the initial and middle regeneration phases. [ABSTRACT FROM AUTHOR]