Qualidade do escoamento na rede de drenagem pluvial urbana: a situação de Brasília-DF

Abstract

The urban stormwater runoff carries pollution loads that contribute to the degradation of water bodies recipients. As a result of the use and oc- cupation of land in urban areas as well as the activities developed in this environment, are generated pollution loads whose place of origin cannot be specified accurately, and in case of rainfall are incorporated into the runoff and transported in the systems drainage until their end point into water bodies’ recipients. Generally, the first part of the runoff tends to be more polluted, and this phenomenon is usually reported in the specialized literature as “first-flush”. The water´s resource manage- ment could be helped to predict how the environmental impact will be if these pollution loads were well known. Thus, this work was motivated by that situation, among other reasons, and presents data from the tracking of a watershed in the urban area of the city of Brasilia/DF, providing new knowledge on first-flush in a urban en- vironment. Different water´s parameters of quality and quantity were evaluated to discern the water deterioration level per runoff time and also kind of occupation along the drainage network.