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A avaliacao ambiental de bacias hidrograficas considerando-se as feicoes geomorfologicas das Cuestas basalticas do Estado de Sao Paulo e uma abordagem relevante e pouco usual nos estudos de bacias hidrograficas localizadas nestas regioes. O Ribeirao Descalvado localiza-se na regiao das Cuestas Basalticas de Botucatu-SP e na Area de Protecao Ambiental (APA) – Perimetro de Botucatu, caracterizando-se por ser um rio obsequente, que sulca a encosta da frente da Cuesta. As Cuestas Basalticas constituem uma formacao unica no planeta e a preservacao de suas feicoes basicas e de fundamental importância. O geoprocessamento utiliza tecnicas matematicas e computacionais capazes de realizar analises complexas ao integrar dados de diversas fontes em um banco de dados georreferenciados. Este trabalho teve por objetivo analisar e diagnosticar os conflitos de uso do solo da bacia do Ribeirao Descalvado, afluente do Rio Capivara, localizado em Botucatu-SP, adotando uma nova abordagem de separacao da sub-bacia nas tres feicoes geomorfologicas, “Reverso da Cuesta”, “Front da Cuesta” e “Depressao Periferica”.  As analises se basearam na construcao de um banco de dados digitais por meio de um Sistema de Informacao Geografica (SIG-SPRING) e de imagens de satelite (CBERS-2). Os procedimentos empregados permitiram a deteccao e mensuracao dos conflitos no uso do solo e inadequacao das APP’s, concluindo-se que a degradacao ambiental na sub-bacia nao apresenta altos percentuais de degradacao globais (6,72% da area total), mas quando adotada a abordagem das feicoes geomorfologicas, observou-se que 53,67% dos conflitos estao localizados no Front da Cuesta. As principais causas sao devido a ausencia das matas ciliares ao longo do rio em estudo e degradacao com relacao ao uso inadequado do solo. Concluiu-se que a abordagem das feicoes geomorfologicas revela aspectos prioritarios no manejo e conservacao de bacias hidrograficas localizadas nas areas de Cuestas basalticas.PALAVRAS-CHAVE: Uso do solo, feicoes geomorfologicas, matas ciliares, CBERS-2. ENVIRONMENTAL DEGRADATION OF DESCALVADO STREAM IN ITS THREE GEOMORPHOLOGICAL FACIES OF THE BASALTIC CUESTA, BOTUCATU,SPABSTRACT: The environmental watersheds assessment that considers the geomorphological facies of the basaltic Cuesta in Sao Paulo State is a relevant and unusual approach in studies of watersheds located in these regions.  Descalvado stream is located at Botucatu-SP in an Ambient Protection Area (APA) and is characterized by being an obsequent river, grooving the Front slope of the Cuesta. The Basaltic Cuesta constitutes a single formation on the planet and the preservation of its basic features is of paramount importance. Geoprocessing uses mathematical and computational techniques capable of performing complex analyses by integrating data from various sources into a geo-referenced database. This work aims to analyze and diagnose conflicts of land use of Descalvado stream, a Capivara’s tributary basin, located in Botucatu, according to the three geomorphological aspects, “Cuesta backslope”, “Cuesta Front” and “peripheric depression”. The analyses were based on a digital database using a Geographic Information System (SIG-SPRING) and satellite images (CBERS-2). It was concluded that environmental degradation in the watershed does not present a high global degradation percentage (6.72% of the total area), but regarding the geomorphological facies, it was observed that 53.67% of the conflicts are located in the “Cuesta Front”. The causes was mainly due to the absence of buffer areas along the studied stream and to inadequate soil use. It was concluded that the geomorphological facies approach reveals priority aspects in the management and conservation of watersheds located in the areas of basaltic Cuesta.KEYWORDS: Land use, geomorphological facies, buffer areas, CBERS-2.

A DEGRADAÇÃO AMBIENTAL DO RIBEIRÃO DESCALVADO NAS SUAS TRÊS FEIÇÕES GEOMORFOLÓGICAS DA CUESTA BASÁLTICA, BOTUCATU-SP1