Assessment of Infiltration Swale Performance as a Low-Impact Development Technique in Tropical Coastal Environments

Author:

Finotti Alexandra Rodrigues1ORCID,Pacheco Elisa Ferreira1,Uda Patricia Kazue1ORCID

Affiliation:

1. Urban Stormwater and Compensatory Technique Laboratory—LAUTEC, Sanitary Engineering Department, Federal University of Santa Catarina, Florianópolis 88040-970, SC, Brazil

Abstract

Operation of source control measures (SCM) in urban drainage in tropical/transitional climates are still a challenge because of higher rain volumes and more intense rains, as well as constraints from sea-level interference. In this study, the performance of a swale to control runoff was detailed and monitored in such an environment. The data on rain, runoff, and sea levels were acquired at a site located in an island in the south coast of Brazil. The results showed that even with higher rain volumes and more intense rains, the mean capture of the swale was 51.7% of the entrance runoff volume, but it depended on seasonal rain variation and interference of sea/tide level. As a result, the swale might be undersized in summer and oversized in winter. Peak flow retardation was observed in 97% of monitored events. The interference of sea/tide level was not directly correlated with infiltration volumes, but in the principal component analysis, the parameters of sea/tide level, along with the hydrological parameters of rain duration, height, and intensity, explained 60% of the variance in the data. In conclusion, the application of SCMs in tropical regions is suitable, but seasonality should be incorporated in the design. The interference of sea/tide level must be further investigated to verify how to incorporate its influence in the design.

Funder

Brazilian research agencies CAPES

CNPQ

Publisher

MDPI AG

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