Características da taxa de infiltra??o e densidade do solo em distintos tipos de cobertura de solo em zona urbana

摘要

http://dx.doi.org/10.5902/2236130810932 The aim of this study was to indicate the land use types in Frederico Westphalen (RS) that are more favorable to storm water infiltration,?looking forward reducing runoff in the city. To achieve the objective it was perform 45 infiltration tests and soil density in different soil?covers. The city was divided in lots, and those were classified according to the following land uses: Mixed Trees (FT), Citrus (C), Grass?(G), Crop Rotation (CR) and Bare Soil (SE). The infiltration tests were carried out with the infiltrometer ring method and also there were?conducted 45 density tests in a lab. Bare Soils showed the lowest infiltration rate (8.05 mm/h) and the higher soil density (1.58 g/cm3). Soils?without green management (SE) do not contribute significantly to rainwater infiltration. FT soils, with less human intervention, showed?higher average rates of infiltration (370.3 mm/h) and less than 1.2 g/cm3of density. Among the remaining land use, airy soils (RC and C)?showed better response to infiltration (between 228.5 and 274.0 mm/h). Although the grass is considered a green area, the results indicated?that the existence of these areas, by itself, it’s not the better strategy for water infiltration in urban areas.