Water quantity investigation of simulated green roofs in a tropical climate: influence of vegetation composition

Thaisa Camila Vacari; Jocilan Rodrigues Lara; Zoraidy Marques de Lima Lima; Eduardo Beraldo de Morais

doi:10.18607/ES201988046

Autores

Thaisa Camila Vacari thaisavacari@gmail.com
Programa de Pós-Graduação em Recursos Hídricos, Faculdade de Arquitetura, Engenharia e Tecnologia, Universidade Federal de Mato Grosso.
Jocilan Rodrigues Lara jocilanlara@hotmail.com
Departamento de Engenharia Sanitária e Ambiental, Faculdade de Arquitetura, Engenharia e Tecnologia, Universidade Federal de Mato Grosso.
Zoraidy Marques de Lima Lima zoraidy@terra.com.br
Departamento de Engenharia Sanitária e Ambiental, Faculdade de Arquitetura, Engenharia e Tecnologia, Universidade Federal de Mato Grosso http://orcid.org/0000-0002-1157-796X
Eduardo Beraldo de Morais beraldo_morais@yahoo.com.br
Universidade Federal de Mato Grosso http://orcid.org/0000-0002-8505-4133

DOI:

10.18607/ES201988046

Palavras-chave:

Organic Substrate. Rainwater Management. Runoff Retention. Grass. Shrub.

Resumo

Green roofs are recognized as a sustainable infrastructure to improve the environmental quality of cities. Among many benefits, green roofs reduce the rate and volume of runoff helping to improve rainwater management. This study investigated the runoff retention capacity of three pilot extensive green roof assemblies with different vegetation (grass, shrub and intercropping of the two plants). Rainwater runoff data were collected for 18 rainfall events that ranged from a minimum of 1.6 mm to a maximum of 157.9 mm. Average precipitation event retention efficiencies were 46.7, 59.7 and 61.6% for intercropped, shrub and grass green roofs, respectively, while the annual runoff retention rates were 43.8, 57.3 and 59.7%. The difference in retention rates for the green roofs with different vegetation was not statistically significant. The rainfall intensity influenced the retention rates, with the highest retentions for small events (<10.0 mm) followed by medium (10.0-24.9 mm). Retention was found to correspond significantly to rainfall depths. On the other hand, regression analysis failed to provide a relationship between retention and antecedent dry weather period (ADWP). The organic soil used as substrate appears to be the deciding factor for rainwater retention.

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Biografia do Autor

Eduardo Beraldo de Morais, Universidade Federal de Mato Grosso

Departamento de Engenharia Sanitária e Ambiental

Microbiologia Sanitária e Ambiental

Recursos Hídricos

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