Abstract
AbstractEngineered media used in living roofs and bioretention plays a crucial role in determining stormwater mitigation performance. Engineered media with compositions varying in four aggregates, volumetric ratio of compost (0, 10, and 20%) and three amendments (zeolite, paving sand, and topsoil) were prepared in the laboratory. Media basic properties including particle-size distribution (PSD), dry bulk density, particle density, porosity, and saturated hydraulic conductivity (Ks), were characterized and investigated as a function of the varying composition. All media are classified as poorly-graded sand (SP), exhibiting porosity greater than 0.51, with magnitudes of Ks ranging from 10−2 to 10−1 cm/s. Media with pumice-based aggregates have particle densities between 2.21 and 2.48 g/cm3. The Ks of a pure aggregate classified as SP is positively related to the particle size corresponding to 50% fines on the cumulative PSD curve. Ks values of four aggregates either remain unchanged or decrease by 73% at ...
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