Bioretention performance under different rainfall regimes in subtropical conditions: A case study in Sao Carlos, Brazil

Autor(es)

de Macedo, Marina Batalini ^[1] ; Ferreira do Lago, Cesar Ambrogi ^[1] ; Mendiondo, Eduardo Mario ^[1] ; Giacomoni, Marcio H. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Hydraul Engn & Sanitat, Av Trabalhador Saocarlense, 400 CP 359, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Texas San Antonio, Dept Civil & Environm Engn, One UTSA Circle, San Antonio, TX 78249 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Environmental Management; v. 248, OCT 15 2019.
• Citações Web of Science: 0

Resumo

Low Impact Development practices have emerged as alternative solutions for traditional urban drainage by restoring the pre-development hydrologic regime. In subtropical climate areas, the performance of these systems is still poorly understood. This study aims to assess the performance of a bioretention basin in a subtropical climate area during an entire hydrological year in order to analyze the differences between dry and rainy seasons. The main climatic factors and conditions influencing the runoff retention efficiency and peak attenuation were also analyzed in order to support bioretention design for flood control purposes. Data of 29 precipitation events were collected over three years (2016-2018). The results show that the bioretention system retained between 9% and 100% of the runoff volume with an average efficiency of 65% during a whole hydrological year. The average runoff retention efficiency was of 73% and 61% for dry and rainy seasons, respectively. This difference is explained by the climatic factors which affected the bioretention performance. During dry periods, the antecedent soil moisture condition and runoff generation rate were found to be more important than the total precipitation depth, while the runoff retention efficiency was primarily influenced by the total rainfall depth and the maximum rainfall intensity during the wet period. Future research should focus on each of these periods in more detail, including water quality aspects. (AU)

• Processo FAPESP: 15/20979-7 - Otimização da operação e manutenção de técnicas compensatórias de drenagem urbana em clima subtropical
• Beneficiário: Marina Batalini de Macedo
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 14/50848-9 - INCT 2014: INCT para Mudanças Climáticas (INCT-MC)
• Beneficiário: Jose Antonio Marengo Orsini
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 17/15614-5 - Técnicas descentralizadas para reciclagem de águas de drenagem urbana visando a segurança hídrica-energética-alimentar
• Beneficiário: Marina Batalini de Macedo
• Modalidade de apoio: Bolsas no Brasil - Doutorado