Estudo do assoreamento do reservatório da barragem do rio Passaúna-Curitiba-PR

Abstract

The reservoir of the river Passaúna's barrage is located in cities of Curitiba and Araucária, within geomorfologic compartment named Paranaense First Plateaus. The research aimed at characterizing the silting occured in the reservoir, which is used for public supplying of water. In order to evaluate the erosive potencial, it was created a map to the hydrografic basin based on parameters of climate, geology, geomorfologic, pedology, use and occupation of the soil. These factors, successively integrated, made possible the discrimination 07 areas in classes of different erosive potential. The area of the reservoir was also directly investigated, with analyzis of the deposited material in the lake. At the period between its wadding in 09/1990 and the sampling in 11/2002, it was registered silting taxes between 0,66 to 3,04 cm/ano. In the area around the reservoir, there were sources of production of sedimentary material. By means of imagening of the deep's reservoir, it was noticed the occurrance of silting in several points in river Passaúna's old main canal and in the foz of the tributaries. The urbanistic conditions in the year of 1991, compared to the year of 2002 indicates that it had degenerated for more critical situations, related with the type use and occupation, over all by the intensification of urbanization areas, and deficit conditions of infrastructure of the urban sanitation. The results let the characterization of the silting, to identify sourse-areas and to indicate procedures to reduce the problems, aiming at reducing the erosive process of the hidrografic basin and the reservoir's silting.