Characterization of In Natura Releases as an Integral Part of the Sewage System of the Cotia River Basin (SP)

Abstract

ABSTRACT

Objective: To spatially and functionally characterize raw sewage discharges in the Cotia River Basin (CRB), aiming to support basic sanitation planning.

Methodology: Vector data from Sabesp and field inspections using dye tests were used to validate discharge points. Contributing areas were delineated using aerial imagery and connection maps, with flow rates estimated based on water consumption. Results were presented through thematic maps, tables, and infographics.

Originality/Relevance: The study introduces an innovative approach by treating raw sewage discharges as functional elements of the sanitation system, offering a replicable methodology with practical applications in urban planning.

Results: A total of 180 discharge points were identified, with an estimated flow of 120.96 L/s (313.5 million liters/month), mostly concentrated in urban areas near water bodies.

Theoretical/Methodological Contributions: The research highlights the effectiveness of integrating geotechnologies and fieldwork for diagnosing and managing untreated sewage.

Social and Environmental Contributions: The findings support public policies for sanitation expansion and water resource protection, while accessible visual tools help raise public awareness.