Design infiltration rate as a function of soil texture for bioretention in Minnesota

The values shown in this table are for uncompacted soils. This table can be used as a guide to determine if a soil is compacted. For information on alleviating compacted soils, link here. If a soil is compacted, reduce the soil infiltration rate by one level (e.g. for a compacted B(SM) use the infiltration rate for a B(MH) soil). Link to this table

Soil texture (USDA classification) Corresponding Unified Soil Classification Corresponding hydrologic soil Group (HSG) Design Infiltration Rate (in/hr)
Gravel, sandy gravel, and silty gravels GW – Well-graded gravel or well-graded gravel with sand

GP – Poorly graded gravel or poorly graded gravel with sand

A 1.63
Sand, loamy sand, and sandy loam GM – Silty gravel or silty gravel with sand

SW – Well-graded sand or well-graded sand with gravel SP – Poorly graded sand or poorly graded sand with gravel

A 0.8
Silty sand SM – Silty sand or silty sand with gravel B 0.45
Silt loam, loam ML – Silt

OL – Organic silt or organic silt with sand or gravel or gravelly organic silt

B 0.3
Sandy clay loam GC – Clayey gravel or clayey gravel with sand

SC – Clayey sand or clayey sand with gravel

C 0.2
Clay, clay loam, silty clay loam, sandy clay, and silty clay CL – Lean clay or lean clay with sand or gravel or gravelly lean clay

CH – Fat clay or fat clay with sand or gravel or gravelly fat clay OH – Organic clay or organic clay with sand or gravel or gravelly organic clay MH – Elastic silt or elastic silt with sand or gravel

D 0.06

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This page was last edited on 16 April 2020, at 16:12.