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Permeable pavements with a structure of a layer reservoir are control devices used to decrease surface runoff, by allowing rainwater to go through them. These structures are used to induce infiltration of rainwater into the soil, and may offer an alternative for the disposal of urban runoff without taking up additional areas. The present study evaluates the evolution of performance for controlling surface runoff of an experimental device consisting of a parking lot with permeable pavements built in 2003, with an area of approximately 264m2 , divided into two types of superficial covering: porous asphalt and grass-covered concrete. During the years of 2003 and 2004, the structure was designed, monitoring devices were detailed, and one year of monitoring was performed (first stage of monitoring). The RBRH – Revista Brasileira de Recursos Hídricos Volume 18 n.1 –Jan/Mar 2013,263‐273 273 present study describes results of a second stage of monitoring, performed in 2007, 2008 and 2009. The surfaces were never submitted to conservation or cleaning, seeking to characterize the condition usually found in most of the Brazilian cases. The performance results of the two monitoring stages of this source control device were compared, showing distinct changes of the quantitative aspects for the two types of coating. Quantitative analysis results of the seventeen observed events show that, in the second stage of monitoring, only the pavement with concrete garden blocks was still able to control the surface runoff volume adequately, even if the runoff values were slightly superior compared to those found in the past in the same experimental device. The surface runoff coefficient values found in the second stage of monitoring were higher than in the first stage, especially in the porous asphalt cover. Key-words: runoff, permeable pavements, quantitative analysis.

Avaliação da Evolução do Comportamento Quantitativo de Pavimentos Permeáveis no Controle do Escoamento Superficial