Contamination of Urban Watersheds: the Case of Arroio Moinho, Porto Alegre, Rio Grande do Sul, Brazil

This article aims to analyze the contamination of water and bottom sediment at Arroio Moinho (Mill Stream), in Porto Alegre (Rio Grande do Sul, Brazil). From two sample collections, a series diagnostic measurements were carried out, such as: a) physical-chemical biological analysis water; b) quality index (WQI); c) metal contamination, granulometric mineralogical analyses sediment; d) total organic carbon (TOC); e) categorization into classes; f) factor (CF) geoaccumulation (Igeo) geoindicators; g) per capita income population density. The analytical results locations exceeded limits established by Class 4 (restricted use). WQI revealed worst level (very bad 2012 2018) all sampling points. showed that spring has low fine-grained fraction content (3%) TOC levels between 8 17%. However, sediments high metals as Zn Cu moderate Pb levels. These allowed stream be classified 3 terms soil quality, requiring identification source pollution ongoing inspection monitor contamination.