Avaliação de impacto ambiental em curso d’água urbano

Córrego Grande, Florianópolis-SC

Abstract

This study evaluated the environmental impacts of urbanization on the Permanent Preservation Areas (PPAs) along the Córrego Grande stream in Florianópolis, Santa Catarina (June 2025). Employing a mixed-methods approach and checklist-based assessment, the stream was divided and analyzed in six segments, from its headwaters, in the Maciço da Costeira, to its confluence with the Itacorubi River. Findings revealed pronounced spatial variability in degradation: Segment 1, located within a Conservation Unit, remained pristine (impact score: 0), whereas Segment 6 (high-density urban zone) exhibited higher degradation (score: 27/34), characterized by channelization, untreated effluent discharge, solid waste accumulation, and 29% illegal PPA occupation. Intermediate segments (2–5) displayed moderated impacts, including: bank erosion, exotic species invasion and localized pollution—partially offset by the Linear Park’s buffering effect. Comparative analysis with prior research highlighted escalating pressures from PPA encroachment and persistent infrastructure deficiencies (e.g., inadequate bridges, unregulated sewage). The study underscores the necessity of coupling federal safeguards (Forest Code, Master Plan compliance) with community-driven, interventions—riparian, rehabilitation and environmental literacy programs—to sustain ecosystem services. The checklist methodology demonstrated efficacy for rapid impact assessment, informing targeted remediation strategies to reintegrate urban streams into socio-ecological landscapes.