In order to evaluate the hydraulic performance of stormwater infiltration trenches, a study was undertaken to assess clogging and its distribution between the bottom and the sides. The method used was based on the calibration of the hydraulic resistance event by event according to Bouwer's model and applied to a demonstration trench in Belo-Horizonte monitored in the framework of the European Project Switch. The calibration was performed by minimizing the distance between measured and modeled infiltration flow rates and by using continuous measurements of rainfall, inflow, water temperature and depth in the trench. The study showed that the methodology and particularly Bouwer's model was able to produce satisfactory results. It revealed a significant clogging evolution within a year, with global resistance increasing by a factor of 9. A significant difference between the bottom and the sides was observed; the bottom being more rapidly prone to clogging. Sudden fluctuations of the hydraulic resistance of the bottom were found that could be explained by very high concentrations of total suspended solids from inflows (about 2,000 mg/L). Clogging of the sides evolves over the time but with a very low rate.
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Research Article|
December 31 2013
A method for evaluating the evolution of clogging: application to the Pampulha Campus infiltration system (Brazil)
S. Barraud;
1Université de Lyon, INSA de Lyon, Université Lyon 1, LGCIE, 34 avenue des Arts, 69621 Villeurbanne, France
E-mail: sylvie.barraud@insa-lyon.fr
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C. Gonzalez-Merchan;
C. Gonzalez-Merchan
1Université de Lyon, INSA de Lyon, Université Lyon 1, LGCIE, 34 avenue des Arts, 69621 Villeurbanne, France
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N. Nascimento;
N. Nascimento
2Departamento de Engenharia Hidráulica e Recursos Hídricos, Universidade Federal de Minas Gerais, Escola de Engenharia, Av. Antônio Carlos, 6627, 31270-901 - Belo Horizonte, MG, Brazil
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P. Moura;
P. Moura
2Departamento de Engenharia Hidráulica e Recursos Hídricos, Universidade Federal de Minas Gerais, Escola de Engenharia, Av. Antônio Carlos, 6627, 31270-901 - Belo Horizonte, MG, Brazil
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A. Silva
A. Silva
3Belo Horizonte Municipality, Av. Afonso Pena, 4000, 30130-009 - Belo Horizonte, MG, Brazil
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Water Sci Technol (2014) 69 (6): 1241–1248.
Article history
Received:
July 29 2013
Accepted:
December 16 2013
Citation
S. Barraud, C. Gonzalez-Merchan, N. Nascimento, P. Moura, A. Silva; A method for evaluating the evolution of clogging: application to the Pampulha Campus infiltration system (Brazil). Water Sci Technol 1 March 2014; 69 (6): 1241–1248. doi: https://doi.org/10.2166/wst.2013.819
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