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.

O presente trabalho teve como objetivo analisar e mostrar a importância de um Plano de Arborização para a cidade de Presidente Epitácio (SP). Utilizou-se como metodologia de levantamento dos dados o uso da ferramenta do Google (Google Street View), com imagens realizadas em 2011 em 68 ruas, sendo as mesmas divididas em par e ímpar. Em função de comparação do ano de 2011 para 2014, um levantamento in loco em 2014 também foi realizado, utilizando o método de avaliação em campo. Os dados foram analisados através de teste t pareado comparando a densidade de árvores por sítio de amostragem. Em termos absolutos observou-se que em cada sítio, ouve um aumento na densidade arbórea entre os anos, embora estatisticamente não significativo. Esse aumento pode ser considerado pela influencia de ações de educação ambiental, através de programas de plantio de árvores realizados nos últimos anos.

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The mode of disposal of waste and effluent from swine breeding constitutes an important practice for environmental compliance of farms. For the need to produce quality and sustainability deploy many ranchers have sought treatment systems process waste from pig farming. Brazil has been increasingly investing in research and implementation of techniques for treating these wastes. Thus, this paper aimed to present the advantages of manure treatment and utilization of animal by-products. The case study refers to a Cooperative Farming of Nova Mutum, MT. The farm currently contains more than 23,000 pigs and waste generated by this process, in addition to producing electricity, are used as biofertilizers in irrigation Eucalyptus after being treated in the digesters. Through empirical calculations it was found that the average biogas is 2,438 m³ per day, with a calorific value greater than 2,000 kWh / day or 60,000 kWh / month, number higher than 22,000 kWh / month currently generated, so the cooperative can increase the capacity of your generator if you want to produce more energy. This requires further study of the efficiency of the treatment and the quantity and quality of effluent produced.