Análise da gestão da drenagem pluvial no município de Contagem

Abstract

The municipality of Contagem had a rapid growth and the State did not manage to keep up with this growth with adequate urban infrastructure, especially in relation to the stormwater drainage system. With the speed of growth and high cost for implementing the adequate system, the municipality paved most of the public roads with the execution of drainage networks in the valleys and plains, while the streets located upstream of the micro-basins were paved without the execution of the networks. These streets have an average slope of 10%, reaching slopes of over 60%. On days of heavy rain, rainwater flows superficially through the paved roads at a speed of over 12m/s, which represents a speed greater than 40km/h. The high displacement energy of the water causes immeasurable tangible and intangible damage. Maintenance and recovery costs are not accounted for, but are extremely high due to annual rework related to pothole operation that occurs in all municipal regions. With the accelerated runoff, infiltrations, evaporation, and other hydrological cycles are interrupted and the municipality suffers direct consequences from this with the extinction of water tables, a decrease in soil and air moisture, and floods. Currently, there is an observed growth of the red flood zone that begs for upstream interventions that aim at retaining and infiltrating fluids at their source, the so-called source control. Given the speed of growth of impermeable areas, if immediate measures are not taken to contain the energy of water displacement, in ten years the damage will be exponentially greater.