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[[File:SoilComposition.png|thumb|Soil Composition]]
This article focuses on the laboratory testing of texture of engineered soils. For information about measuring the properties of the native soils, see [[Design infiltration rate]].
[[File:SoilComposition.png|thumb|SoilComposition]]
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The [[filter media]] component of [[bioretention]], [[swales]] and [[green roofs]] must meet very specific design specifications related to texture in order for the BMP to achieve drainage and water treatment performance targets. If the media texture is too fine (i.e., contains more silt- and clay-sized particles than specified) it may have low permeability and [[Drainage time|drain too slowly]] or retain too much water for excessively long periods of time.
The [[filter media]] component of [[bioretention]], [[swales]] and [[green roofs]] must meet very specific design specifications related to texture in order for the BMP to achieve drainage and water treatment performance targets. If the media texture is too fine (i.e., contains more silt- and clay-sized particles than specified) it may have low permeability and [[Drainage time|drain too slowly]] or retain too much water for excessively long periods of time.
==Testing==
==Testing==
Soil texture is most accurately characterized by submitting a representative sample to a soil laboratory for a particle-size distribution (PSD) test. Other commonly used terms for the PSD test by soil laboratories are “Particle-Size Analysis”, “Grain-Size Distribution” and “% Sand, % Silt, % Clay”.
Soil texture is most accurately characterised by submitting a representative sample to a soil laboratory for a particle-size distribution (PSD) test. Other commonly used terms for the PSD test by soil laboratories are “Particle-Size Analysis”, “Grain-Size Distribution” and “% Sand, % Silt, % Clay”.
For bioretention filter media and green roof growing media, “Sand Fraction Analysis” should also be requested.
For bioretention filter media and green roof growing media, “Sand Fraction Analysis” should also be requested.