A SYSTEM TO PERMEATE THE PLUVIAL WATER IN SOIL AND SUBSOIL OF CURITIBA BASIN AT URBAN STREETS

Abstract

The development of the cities, no matter how orderly it is, changes the environment. Where there usedto be fields and forests, there are now buildings, paved streets, galleries of pluvial waters, etc. The covering of land withimpermeable surfaces is one of the factors that changes the hidrological cycle, because it obstructs the water percolation tothe underground and increases the runoff, which causes floods, erosions and sedimentations. The underground water flow issubstantially altered because it is not recharged, therefore, it does not feed the rivers at dry seasons anymore causing adecrease of the river flow. In this context, we see the importance of the geological study of Curitiba region, in order toimplement a system which can infiltrate the pluvial waters. The objective of this study so, is to create a system of pluvialwater flow control on public streets in a small scale, through the installation of “gully pots” made up with a contention andinfiltration system of these waters at two points with different litologic features, the Guabirotuba’s Formation and the AtubaComplex, in the insaturated layer of the soil and subsoil of Curitiba’s sedimentary basin. The system will allow for thesoftening of these environmental changes, refeeding the underground water, keeping the river level in dry seasons and willmitigate the consequences of the floods, erosions and sedimentations in intensive rain seasons.